Draft California 2024 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 4 - Los Angeles Region

Water Body Name:	Los Angeles River Reach 5 ( within Sepulveda Basin)
Water Body ID:	CAR4052100019990202093310
Water Body Type:	River & Stream


DECISION ID	150446	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Ammonia
Final Listing Decision:	Delist from 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2018)
Revision Status	Revised
Reason for Delisting:	Applicable WQS attained; due to restoration activities
TMDL Name:	Los Angeles River Nitrogen (11)
TMDL Project Code:	229
Date TMDL Approved by USEPA:	03/18/2004
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 4.1 and 4.11 of the Listing Policy. Under section 4.1 a single line of evidence is necessary to assess listing status. According to section 4.11 of the Listing Policy, when all other delisting factors do not result in the delisting of a water segment but information indicates attainment of standards, a water segment may be evaluated to determine whether the weight of evidence demonstrates attainment. When the implementation of a management practice results in a change in water quality, Section 6.1.5.3 of the Listing Policy allows consideration of only data collected since the implementation. The primary source of ammonia in Los Angeles River Reach 5 is effluent from the Donald C. Tillman Water Reclamation Plant, which in 2007 installed nitrification/denitrification processes to reduce ammonia in effluent. These processes represent such a change in management practices, resulting in improved water quality in the waterbody segment downstream of the facility's discharge. It is therefore reasonable to consider only data collected since the change in practice. See section 8 of the Staff Report for more information. In Los Angeles River Reach 5, the lines of evidence assessed in a previous cycle showed 18 samples exceeding the water quality objective for ammonia in the period 2006 to 2007. All exceedances in these lines of evidence were prior to 2007. From 2012 onward, after installation, 4 of 88 samples exceeded the objective. One line of evidence is available in the administrative record to assess this pollutant. 4 of the 88 samples exceeded the objective for ammonia. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of 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. 4 of 88 samples exceeded the objective 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 being 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:

Line of Evidence (LOE) for Decision ID 150446, Ammonia	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253314

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 4 of the 88 samples exceeded the water quality threshold for Ammonia as N. Although a total of 89 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (775473).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-03-06 to 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 150446, Ammonia	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86204

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Ten out of 46 averaged samples exceeded the site specific Basin Plan objective for total ammonia as nitrogen during the months of April through September. A total of 221 samples were collected. All exceedances were prior to August 2007. None of the samples in sampling location "I" exceeded the site specific objective.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Los Angeles Regional Water Quality Control Plan objective for ammonia is a function of pH, temperature, and the presence of early life stages. Site specific objectives for this water body are based upon the presence of early life stages during April 1 through September 30 as stated in Table 3-4. "Site-Specific 30-day Average Objectives for Ammonia by Waterbody Reach."

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected in three Lake Balboa locations: D (at the confluence of the Los Angeles River and Hayvenhurst Channel), H (at the confluence of the Los Angeles River and Bull Creek), I (Los Angeles River, upstream of Bull Creek).

Temporal Representation:

Samples were collected quarterly in 2006 and beginning of 2007. Samples were collected weekly starting March 2007 through May 2010.

Environmental Conditions:

QAPP Information:

The samples were collected by the Environmental Monitoring Division of the City of Los Angeles using a quality assurance program for all laboratory analysis. These laboratories are individually certified by the Environmental Laboratory Accreditation Program (ELAP) of the California Department of Health Services.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 150446, Ammonia	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2520

Pollutant:

Ammonia

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 150446, Ammonia	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86205

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Eight out of 55 averaged samples exceeded the site specific Basin Plan objective for total ammonia as nitrogen during the months of October through March. A total of 174 samples were collected. All exceedances occurred on or before March 2007. None of the samples in sampling location "I" exceeded the site specific objective.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Los Angeles Regional Water Quality Control Plan objective for ammonia is a function of pH, temperature, and the presence of early life stages. Site specific objectives for this water body are based upon the absence of early life stages during October 1 through March 31 as stated in Table 3-4. "Site-Specific 30-day Average Objectives for Ammonia by Waterbody Reach."

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Samples were collected quarterly in 2006 and beginning of 2007. Samples were collected weekly starting March 2007 through May 2010.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	138564	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Copper
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Name:	Los Angeles River Metals (13)
TMDL Project Code:	237
Date TMDL Approved by USEPA:	12/22/2005
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal on the CWA section 303(d) List under sections 2.2 and sections 4.1 and 4.6 of the Listing Policy. Under section 4.1 of the Policy, a minimum of one line of evidence is needed to assess listing status. 2 lines of evidence are available in the administrative record to assess this pollutant. 0 of the 12 samples exceeded the guideline for copper in sediment. 50 of the 105 samples exceeded the criteria for copper in water. LOE 2527 is a placeholder for a decision made prior to 2006 and which is not held in this database. It will not be considered because there are sufficient other data. 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. There is sufficient justification to place it in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard. 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. 50 of 105 samples exceeded the criteria for copper in water and these exceed the allowable frequency listed in Table 4.1 of the Listing Policy. 4. The TMDL for Metals in the Los Angeles River and Tributaries was approved by USEPA on 12/22/2005. 5. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board 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:

Line of Evidence (LOE) for Decision ID 138564, Copper	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253968

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 9 of 35 samples exceeded the water quality threshold for Copper.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138564, Copper	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254267

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 22 of 35 samples exceeded the water quality threshold for Copper.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138564, Copper	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254019

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 19 of 35 samples exceeded the water quality threshold for Copper.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138564, Copper	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2527

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a listing decision made by USEPA for 2006.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 138564, Copper	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86184

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the twelve samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	138596	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	1,1,2-Trichloroethane
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 3.1 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 placing 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 54 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 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:

Line of Evidence (LOE) for Decision ID 138596, 1,1,2-Trichloroethane	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256077

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.

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: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138596, 1,1,2-Trichloroethane	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256299

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.

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: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138596, 1,1,2-Trichloroethane	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256279

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.

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: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138580	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	2,4-D (2,4-Dichlorophenoxy acetic acid)
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 3.1 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 placing 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 54 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 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:

Line of Evidence (LOE) for Decision ID 138580, 2,4-D (2,4-Dichlorophenoxy acetic acid)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254388

Pollutant:

2,4-D (2,4-Dichlorophenoxy acetic acid)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Dichlorophenoxyacetic Acid, 2,4-.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The evaluation guideline for dichlorophenoxyacetic acid, 2,4- (2,4-D) is the USEPA Aquatic Life Benchmark of 299.2 ug/L for a vascular plant (acute).

Guideline Reference:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138580, 2,4-D (2,4-Dichlorophenoxy acetic acid)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254387

Pollutant:

2,4-D (2,4-Dichlorophenoxy acetic acid)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Dichlorophenoxyacetic Acid, 2,4-.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The evaluation guideline for dichlorophenoxyacetic acid, 2,4- (2,4-D) is the USEPA Aquatic Life Benchmark of 299.2 ug/L for a vascular plant (acute).

Guideline Reference:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138580, 2,4-D (2,4-Dichlorophenoxy acetic acid)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254436

Pollutant:

2,4-D (2,4-Dichlorophenoxy acetic acid)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Dichlorophenoxyacetic Acid, 2,4-.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The evaluation guideline for dichlorophenoxyacetic acid, 2,4- (2,4-D) is the USEPA Aquatic Life Benchmark of 299.2 ug/L for a vascular plant (acute).

Guideline Reference:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138594	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Acrolein
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.

Line of Evidence (LOE) for Decision ID 138594, Acrolein	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253421

Pollutant:

Acrolein

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Acrolein. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA recommended acrolein criterion for the protection of aquatic life in freshwater is 3 ug/L ( 4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138594, Acrolein	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253445

Pollutant:

Acrolein

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA recommended acrolein criterion for the protection of aquatic life in freshwater is 3 ug/L ( 4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138594, Acrolein	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253350

Pollutant:

Acrolein

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA recommended acrolein criterion for the protection of aquatic life in freshwater is 3 ug/L ( 4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138595	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Aldrin
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 3.1 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 against 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 54 samples exceeded the guideline 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:

Line of Evidence (LOE) for Decision ID 138595, Aldrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253268

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Aldrin.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The aldrin criterion maximum concentration (expressed as a 1-day average) to protect aquatic life in freshwater is 1.5 ug/L. The criterion of 3 ug/L provided in the California Toxics Rule is an instantaneous maximum concentration and was divided by 2 in order to better represent a criterion maximum concentration (CMC) value as specified in footnote (g) of Table (b)(1) of the California Toxics Rule (2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138595, Aldrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253357

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Aldrin.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138595, Aldrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253570

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Aldrin.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138557	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

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:	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. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination 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 54 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 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:

Line of Evidence (LOE) for Decision ID 138557, Antimony	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253280

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Antimony.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138557, Antimony	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253434

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Antimony.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138557, Antimony	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253278

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Antimony.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138558	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

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:	This pollutant is being considered for placement on the CWA section 303(d) List under sections 3.1 and 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. Two line of evidence is available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 54 samples exceeded the criteria for arsenic in water and 0 of 8 samples exceed the guideline for arsenic in sediment and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 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.

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:

Line of Evidence (LOE) for Decision ID 138558, Arsenic	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253526

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Arsenic.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138558, Arsenic	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253391

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Arsenic.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138558, Arsenic	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253436

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Arsenic.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138558, Arsenic	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86173

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	138571	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Azinphos-methyl (Guthion)
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.

Line of Evidence (LOE) for Decision ID 138571, Azinphos-methyl (Guthion)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253307

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Azinphos Methyl. Although a total of 19 samples were collected, 19 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 National Recommended Water Quality Criteria for azinphos methyl for freshwater aquatic life protection is 0.01 ug/l (instantaneous maximum)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138571, Azinphos-methyl (Guthion)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253308

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Azinphos Methyl. Although a total of 19 samples were collected, 19 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 National Recommended Water Quality Criteria for azinphos methyl for freshwater aquatic life protection is 0.01 ug/l (instantaneous maximum)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138571, Azinphos-methyl (Guthion)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253654

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Azinphos Methyl. Although a total of 19 samples were collected, 19 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 National Recommended Water Quality Criteria for azinphos methyl for freshwater aquatic life protection is 0.01 ug/l (instantaneous maximum)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138559	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Beryllium
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 3.1 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 placing 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 54 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 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:

Line of Evidence (LOE) for Decision ID 138559, Beryllium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253924

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Beryllium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The Gold Book states that beryllium chronic toxicity to freshwater aquatic life occur at concentrations as low as 5.3 ug/L.

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: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138559, Beryllium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253841

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Beryllium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The Gold Book states that beryllium chronic toxicity to freshwater aquatic life occur at concentrations as low as 5.3 ug/L.

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: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138559, Beryllium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253863

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Beryllium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The Gold Book states that beryllium chronic toxicity to freshwater aquatic life occur at concentrations as low as 5.3 ug/L.

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: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138560	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

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:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 and 3.6 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 placing 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 105 samples exceeded the criteria for cadmium in water and 0 of 8 samples exceeded the guideline for cadmium in sediment 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 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:

Line of Evidence (LOE) for Decision ID 138560, Cadmium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253734

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Cadmium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138560, Cadmium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253731

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Cadmium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138560, Cadmium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253709

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Cadmium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138560, Cadmium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86176

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for cadmium is 4.98 mg/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	138561	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Chlordane
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 and 3.6 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 against 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 18 samples exceeded the criteria for chlordane in water and 0 of 8 samples exceeded the guideline for chlordane in sediment 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:

Line of Evidence (LOE) for Decision ID 138561, Chlordane	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255911

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the water quality threshold for Total Chlordane. Although a total of 18 samples were collected, 12 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (775457).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138561, Chlordane	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255891

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the water quality threshold for Total Chlordane. Although a total of 18 samples were collected, 12 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (775464).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138561, Chlordane	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255912

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the water quality threshold for Total Chlordane. Although a total of 18 samples were collected, 12 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (775473).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138561, Chlordane	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86181

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

One of the eight samples exceeded the evaluation guideline for total chlordane.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for total chlordane is 17.6 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	138562	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

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:	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. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 3 of 105 samples exceeded the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board 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:

Line of Evidence (LOE) for Decision ID 138562, Chloride	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253785

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Chloride.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138562, Chloride	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253809

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 3 of 35 samples exceeded the water quality threshold for Chloride.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138562, Chloride	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253787

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Chloride.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138563	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Chlorine
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.

Line of Evidence (LOE) for Decision ID 138563, Chlorine	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253669

Pollutant:

Chlorine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Chlorine, Total Residual. Although a total of 418 samples were collected, 418 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: Chlorine residual shall not be present in surface water any concentration that causes impairment of beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA recommended chlorine criterion for the protection of aquatic ife in freshwater is 11 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138563, Chlorine	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253609

Pollutant:

Chlorine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Chlorine, Total Residual. Although a total of 419 samples were collected, 419 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: Chlorine residual shall not be present in surface water any concentration that causes impairment of beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA recommended chlorine criterion for the protection of aquatic ife in freshwater is 11 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138563, Chlorine	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253688

Pollutant:

Chlorine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Chlorine, Total Residual. Although a total of 417 samples were collected, 417 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: Chlorine residual shall not be present in surface water any concentration that causes impairment of beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA recommended chlorine criterion for the protection of aquatic ife in freshwater is 11 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138597	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

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:	This pollutant is being considered for placement on the CWA section 303(d) List under sections 3.1 and 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. Two line of evidence is available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 54 samples exceeded the criteria for chromium in water and 0 of 8 samples exceed the guideline for chromium in sediment and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 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.

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:

Line of Evidence (LOE) for Decision ID 138597, Chromium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86182

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for chromium is 111 mg/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 138597, Chromium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253633

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Chromium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138597, Chromium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253896

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Chromium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138597, Chromium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253918

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Chromium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138565	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Cyanide
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 3.1 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 placing 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. 3 of 315 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 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:

Line of Evidence (LOE) for Decision ID 138565, Cyanide	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254113

Pollutant:

Cyanide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

105

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 2 of 105 samples exceeded the water quality threshold for Cyanide.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The cyanide criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-10-06

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138565, Cyanide	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254231

Pollutant:

Cyanide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

105

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 1 of 105 samples exceeded the water quality threshold for Cyanide.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The cyanide criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-10-06

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138565, Cyanide	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254186

Pollutant:

Cyanide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

105

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 105 samples exceeded the water quality threshold for Cyanide.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The cyanide criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-10-06

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	149701	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
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 3.6 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. 2 lines of evidence are available in the administrative record to assess this pollutant. 0 of 8 samples exceed the GUIDELINE. 0 of 0 samples exceed the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 8 and 0 of 0 samples exceed the GUIDELINE and this sample size is INSUFFICIENT to determine beneficial use support, with the power and confidence of the Listing Policy. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using Table 3.1There 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.

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:

Line of Evidence (LOE) for Decision ID 149701, DDT (Dichlorodiphenyltrichloroethane)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86190

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for sum of DDT is 62.9 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 149701, DDT (Dichlorodiphenyltrichloroethane)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254096

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The DDT(4,4') criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 149701, DDT (Dichlorodiphenyltrichloroethane)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254167

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The DDT(4,4') criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 149701, DDT (Dichlorodiphenyltrichloroethane)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254071

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The DDT(4,4') criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138598	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Demeton
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 removal from the CWA 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. 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. 2 of 21 samples exceeded the criteria and this exceeds 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 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:

Line of Evidence (LOE) for Decision ID 138598, Demeton	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253957

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the water quality threshold for Demeton, Total. Although a total of 19 samples were collected, 12 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 National Recommended Water Quality criterion for demeton for freshwater aquatic life protection is 0.1 ug/l (4 day average)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (775457).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138598, Demeton	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254004

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the water quality threshold for Demeton, Total. Although a total of 19 samples were collected, 12 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 National Recommended Water Quality criterion for demeton for freshwater aquatic life protection is 0.1 ug/l (4 day average)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (775464).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138598, Demeton	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

253981

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the water quality threshold for Demeton, Total. Although a total of 19 samples were collected, 12 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 National Recommended Water Quality criterion for demeton for freshwater aquatic life protection is 0.1 ug/l (4 day average)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (775473).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138567	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Diazinon
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 3.1 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 against 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. 2 of 35 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:

Line of Evidence (LOE) for Decision ID 138567, Diazinon	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254498

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 0 of the 13 samples exceeded the water quality threshold for Diazinon. Although a total of 34 samples were collected, 21 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 freshwater chronic value for diazinon is 0.10 ug/L (4 day average)(Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game (with minor corrections to significant figures as described in Beaulaurier et al., 2005).

Spatial Representation:

The samples were collected at 1 monitoring site (775457).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-05-01 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138567, Diazinon	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254386

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 1 of the 13 samples exceeded the water quality threshold for Diazinon. Although a total of 34 samples were collected, 21 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 freshwater chronic value for diazinon is 0.10 ug/L (4 day average)(Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (775464).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-05-01 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138567, Diazinon	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254562

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 1 of the 9 samples exceeded the water quality threshold for Diazinon. Although a total of 34 samples were collected, 25 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 freshwater chronic value for diazinon is 0.10 ug/L (4 day average)(Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (775473).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-05-08 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138568	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Dieldrin
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 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 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 54 samples exceeded the criteria for dieldrin in water and 0 of 8 samples exceeded the guideline for dieldrin in sediment 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:

Line of Evidence (LOE) for Decision ID 138568, Dieldrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254528

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Dieldrin.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dieldrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138568, Dieldrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86191

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for dieldrin is 61.8 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 138568, Dieldrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254567

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Dieldrin.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dieldrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138568, Dieldrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254568

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Dieldrin.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dieldrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138569	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Endosulfan sulfate
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 3.1 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 against 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 54 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:

Line of Evidence (LOE) for Decision ID 138569, Endosulfan sulfate	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254582

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endosulfan Sulfate.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 National Recommended Water Quality Criteria toxicity threshold for endosulfan sulfate for freshwater aquatic life protection is 0.056 ug/l (24 hour average)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138569, Endosulfan sulfate	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254629

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endosulfan Sulfate.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 National Recommended Water Quality Criteria toxicity threshold for endosulfan sulfate for freshwater aquatic life protection is 0.056 ug/l (24 hour average)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138569, Endosulfan sulfate	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254538

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endosulfan Sulfate.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 National Recommended Water Quality Criteria toxicity threshold for endosulfan sulfate for freshwater aquatic life protection is 0.056 ug/l (24 hour average)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138570	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Endrin
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 and 3.6 of the Listing Policy. Under section 3.1, one line of evidence is necessary to assess listing status. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List. 2 line of evidence is available in the administrative record to assess this pollutant. 0 of 8 samples exceed the GUIDELINE for endrin in sediment 0 of 54 samples exceed the criteria for endrin in water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 54 samples exceed the criteria and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 0 of 8 samples exceed the GUIDELINE and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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:

Line of Evidence (LOE) for Decision ID 138570, Endrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254334

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endrin.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.036 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138570, Endrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254767

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endrin.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.036 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138570, Endrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86192

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for endrin is 207 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 138570, Endrin	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254790

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endrin.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.036 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138572	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Heptachlor
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.

Line of Evidence (LOE) for Decision ID 138572, Heptachlor	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255034

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The heptachlor criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138572, Heptachlor	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254710

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The heptachlor criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138572, Heptachlor	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255035

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The heptachlor criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138573	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Heptachlor epoxide
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 3.6 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 line of evidence is available in the administrative record to assess this pollutant. 0 of 11 samples exceed the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is INSUFFICIENT justification FOR placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 11 samples exceed the GUIDELINE and this sample size is INSUFFICIENT to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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 this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 138573, Heptachlor epoxide	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86196

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eleven samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for heptachlor epoxide is 16.0 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 138573, Heptachlor epoxide	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254818

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The heptachlor epoxide criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138573, Heptachlor epoxide	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254883

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The heptachlor epoxide criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138573, Heptachlor epoxide	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254756

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The heptachlor epoxide criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138574	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
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 3.6 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. 2 lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against 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 12 and 0 of 54 samples exceed the guideline and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 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.

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:

Line of Evidence (LOE) for Decision ID 138574, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86198

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the twelve samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for Lindane (gamma-BHC) is 4.99 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 138574, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254793

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for HCH, gamma-.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The gamma-BHC (Lindane, gamma-HCH) criterion maximum concentration to protect aquatic life in freshwater is 0.95 ug/L. (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138574, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254726

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for HCH, gamma-.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The gamma-BHC (Lindane, gamma-HCH) criterion maximum concentration to protect aquatic life in freshwater is 0.95 ug/L. (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138574, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254728

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for HCH, gamma-.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The gamma-BHC (Lindane, gamma-HCH) criterion maximum concentration to protect aquatic life in freshwater is 0.95 ug/L. (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138575	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

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:	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.

Line of Evidence (LOE) for Decision ID 138575, Malathion	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255224

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 19 samples were collected, 19 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138575, Malathion	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255182

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 19 samples were collected, 19 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138575, Malathion	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255204

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 19 samples were collected, 19 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	150112	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Mercury
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 sections 3.1 and 3.6 of the Listing Policy. Under section 3.6 one line of evidence is necessary to assess listing status. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List. 2 line of evidence is available in the administrative record to assess this pollutant. 0 of 12 samples exceed the guideline. 0 of 234 samples exceed the criteria. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 234 samples exceeded the criteria and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 0 of 12 samples exceed the GUIDELINE and this sample size is INSUFFICIENT to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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:

Line of Evidence (LOE) for Decision ID 150112, Mercury	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255144

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 78 samples exceeded the water quality threshold for Mercury.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentration (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 150112, Mercury	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86199

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the twelve samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury is 1.06 mg/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 150112, Mercury	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255304

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 78 samples exceeded the water quality threshold for Mercury.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentration (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 150112, Mercury	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255372

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 78 samples exceeded the water quality threshold for Mercury.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentration (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138576	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Methoxychlor
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 3.1 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 against 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 54 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:

Line of Evidence (LOE) for Decision ID 138576, Methoxychlor	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255358

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Methoxychlor.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (CCC) expressed as a 4-day average for methoxychlor is 0.03 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138576, Methoxychlor	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255103

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Methoxychlor.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (CCC) expressed as a 4-day average for methoxychlor is 0.03 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138576, Methoxychlor	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255378

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Methoxychlor.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (CCC) expressed as a 4-day average for methoxychlor is 0.03 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138577	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Mirex
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.

Line of Evidence (LOE) for Decision ID 138577, Mirex	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255232

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Mirex. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 national recommended criterion continuous concentration for mirex for the protection of freshwater aquatic life is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138577, Mirex	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255216

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Mirex. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 national recommended criterion continuous concentration for mirex for the protection of freshwater aquatic life is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138577, Mirex	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255254

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Mirex. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 national recommended criterion continuous concentration for mirex for the protection of freshwater aquatic life is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138578	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Naphthalene
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 3.1 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 placing 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 54 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 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:

Line of Evidence (LOE) for Decision ID 138578, Naphthalene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255064

Pollutant:

Naphthalene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Naphthalene.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 USEPA recommended naphthalene criterion for the protection of freshwater aquatic life is 620 ug/l. (EPA 440/5-80-059)

Guideline Reference:

Ambient Water Quality Criteria for Naphthalene

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-18

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138578, Naphthalene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255316

Pollutant:

Naphthalene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Naphthalene.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA recommended naphthalene criterion for the protection of freshwater aquatic life is 620 ug/l. (EPA 440/5-80-059)

Guideline Reference:

Ambient Water Quality Criteria for Naphthalene

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-18

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138578, Naphthalene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255083

Pollutant:

Naphthalene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Naphthalene.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The USEPA recommended naphthalene criterion for the protection of freshwater aquatic life is 620 ug/l. (EPA 440/5-80-059)

Guideline Reference:

Ambient Water Quality Criteria for Naphthalene

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-18

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138579	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

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:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 and 3.6 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 placing 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 54 samples exceeded the criteria for nickel in water and 0 of 8 samples exceeded the guideline for nickel in sediment 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 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:

Line of Evidence (LOE) for Decision ID 138579, Nickel	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255238

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Nickel.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138579, Nickel	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255196

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Nickel.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138579, Nickel	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255197

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Nickel.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138579, Nickel	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86200

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for nickel is 48.6 mg/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	149702	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

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:	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 against 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 711 samples exceeded the objective 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:

Line of Evidence (LOE) for Decision ID 149702, Nitrogen, Nitrate	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

302564

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

237

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 237 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-14 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 149702, Nitrogen, Nitrate	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

302608

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

237

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 237 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-14 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 149702, Nitrogen, Nitrate	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

302624

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

237

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 237 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-14 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138581	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Organophosphate Pesticides
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 3.1 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 against 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 67 samples exceeded the GUIDELINE 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:

Line of Evidence (LOE) for Decision ID 138581, Organophosphate Pesticides	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255551

Pollutant:

Organophosphate Pesticides

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 0 of the 23 samples exceeded the water quality threshold for Organophosphorus Pesticides. Although a total of 29 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 evaluation guideline for the protection of aquatic life from the additive effects of the organophosphate pesticides chlorpyrifos and diazinon is one toxic unit equivalent. A toxic unit equivalent is equal to the sum of chlorpyrifos and diazinon from a single sample, each having their reported concentration divided their respective evaluation guideline prior to being summed. If this results in a value greater than one, the sample is considered to be in exceedance of the water quality standard. (Bailey et al., 1997).

Guideline Reference:

Joint acute toxicity of Diazinon and Chlorpyrifos to Ceriodaphnia dubia.

Spatial Representation:

The samples were collected at 1 monitoring site (775464).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-05-01 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138581, Organophosphate Pesticides	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255593

Pollutant:

Organophosphate Pesticides

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 0 of the 22 samples exceeded the water quality threshold for Organophosphorus Pesticides. Although a total of 28 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Guideline Reference:

Joint acute toxicity of Diazinon and Chlorpyrifos to Ceriodaphnia dubia.

Spatial Representation:

The samples were collected at 1 monitoring site (775473).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-05-08 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138581, Organophosphate Pesticides	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255698

Pollutant:

Organophosphate Pesticides

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and the results are as follows: 0 of the 22 samples exceeded the water quality threshold for Organophosphorus Pesticides. Although a total of 28 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Guideline Reference:

Joint acute toxicity of Diazinon and Chlorpyrifos to Ceriodaphnia dubia.

Spatial Representation:

The samples were collected at 1 monitoring site (775457).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-05-01 to 2020-05-05

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	151918	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Oxygen, Dissolved
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 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 139 of 1256 samples exceeded the OBJECTIVE and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board 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:

Line of Evidence (LOE) for Decision ID 151918, Oxygen, Dissolved	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86206

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

545

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Numeric data generated from 545 averages of Dissolved Oxygen concentration had 34 exceedences.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved Oxygen Water Quality Objective of all surface waters designated as Warm Fresh Water Aquatic Habitat shall not be depressed below 5 mg/l.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Lake D, Lake H, and Lake I.

Temporal Representation:

Samples were collected approximately once a week from January 2006 to May 2010.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 151918, Oxygen, Dissolved	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

308152

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

237

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 98 of 237 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 3-39) states that: The dissolved oxygen content of all surface waters designated as WARM shall not be depressed below 5 mg/L as a result of waste discharges.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-14 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 151918, Oxygen, Dissolved	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

308026

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

237

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 3 of 237 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-14 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 151918, Oxygen, Dissolved	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

308177

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

237

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 4 of 237 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-14 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138586	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	PCBs (Polychlorinated biphenyls)
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.

Line of Evidence (LOE) for Decision ID 138586, PCBs (Polychlorinated biphenyls)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86207

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for total PCBs is 676 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 138586, PCBs (Polychlorinated biphenyls)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255597

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls). Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The PCB, total aroclors criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.014 ug/L. This value corresponds to the sum of aroclors 1242, 1254, 1221, 1232, 1248, 1260, and 1016 (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138586, PCBs (Polychlorinated biphenyls)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255398

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls). Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138586, PCBs (Polychlorinated biphenyls)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255662

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls). Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138583	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Parathion
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.

Line of Evidence (LOE) for Decision ID 138583, Parathion	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255511

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Parathion, Ethyl. Although a total of 19 samples were collected, 19 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 recommended freshwater aquatic life ambient water quality chronic criteria for parathion is 0.013 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138583, Parathion	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255512

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Parathion, Ethyl. Although a total of 19 samples were collected, 19 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 recommended freshwater aquatic life ambient water quality chronic criteria for parathion is 0.013 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138583, Parathion	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255513

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Parathion, Ethyl. Although a total of 19 samples were collected, 19 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 recommended freshwater aquatic life ambient water quality chronic criteria for parathion is 0.013 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-09-09

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138584	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Pentachlorophenol (PCP)
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 3.1 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 against 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 55 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:

Line of Evidence (LOE) for Decision ID 138584, Pentachlorophenol (PCP)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255645

Pollutant:

Pentachlorophenol (PCP)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Pentachlorophenol.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The pentachlorophenol criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is pH dependent. The criterion using a default pH value of 7.8 (when pH data is not present) is 15 ug/L. (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-18

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138584, Pentachlorophenol (PCP)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255584

Pollutant:

Pentachlorophenol (PCP)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality threshold for Pentachlorophenol.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-18

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138584, Pentachlorophenol (PCP)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255604

Pollutant:

Pentachlorophenol (PCP)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Pentachlorophenol.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-18

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138588	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Silver
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 3.1 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 placing 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 54 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 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:

Line of Evidence (LOE) for Decision ID 138588, Silver	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255787

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Silver.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved silver criterion maximum concentration (CMC) to protect aquatic life in freshwater is hardnesss dependent. The criterion when calculated using a default hardness of 100 mg/L is 3.4 ug/L. This criterion was divided by 2 in order to better represent a CMC value as specified in footnote (g) of Table (b)(1) of the California Toxics Rule, 2000.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138588, Silver	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255808

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Silver.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138588, Silver	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255762

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Silver.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138589	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Temperature, water
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 3.2 of the Listing Policy. Under section 3.2 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 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. 5 of 544 and 136 of 1234 samples exceeded the OBJECTIVE and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board 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:

Line of Evidence (LOE) for Decision ID 138589, Temperature, water	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255985

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

418

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 50 of 418 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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 3-45) states that: For waters designated WARM, water temperature shall not be altered by more than 5 °F above the natural temperature. At no time shall these WARM-designated waters be raised above 80 °F as a result of waste discharges.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138589, Temperature, water	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255792

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

419

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 19 of 419 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138589, Temperature, water	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256025

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

417

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 67 of 417 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138589, Temperature, water	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86213

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

544

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Numeric data generated from 544 averages of temperature had 5 exceedence.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

At no time shall warm freshwater habitat-designated waters be raised above 80 degrees Fahrenheit as a result of waste discharges.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Lake D, Lake H, and Lake I.

Temporal Representation:

Samples were collected approximately once a week from January 2006 to May 2010.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	138590	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Thallium
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 3.1 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 against 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 54 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:

Line of Evidence (LOE) for Decision ID 138590, Thallium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256010

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Thallium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,600 hours of exposure. (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: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138590, Thallium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255949

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Thallium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,600 hours of exposure. (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: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138590, Thallium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255929

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Thallium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,600 hours of exposure. (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: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138591	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Toxaphene
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.

Line of Evidence (LOE) for Decision ID 138591, Toxaphene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256243

Pollutant:

Toxaphene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Toxaphene. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The toxaphene criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0002 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138591, Toxaphene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256113

Pollutant:

Toxaphene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Toxaphene. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The toxaphene criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0002 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138591, Toxaphene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256128

Pollutant:

Toxaphene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Toxaphene. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The toxaphene criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0002 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-07 to 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138592	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

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. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 105 samples exceeded the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board 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:

Line of Evidence (LOE) for Decision ID 138592, Turbidity	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256202

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Turbidity.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138592, Turbidity	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256183

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Turbidity.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Guideline Reference:

The Effects of Turbidity on Prey Selection by Piscivorous Largemouth Bass

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138592, Turbidity	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256184

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Turbidity.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Guideline Reference:

The Effects of Turbidity on Prey Selection by Piscivorous Largemouth Bass

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138593	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Zinc
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 sections 3.1 and 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List. Based on the readily available data and information, the weight of evidence indicates that there is INSUFFICIENT justification FOR placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 105 samples exceed the criteria for zinc in water and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 0 of 8 samples exceed the guideline for zinc in sediment and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 138593, Zinc	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86215

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for zinc is 459 mg/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 138593, Zinc	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256142

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Zinc.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138593, Zinc	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256126

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Zinc.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138593, Zinc	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

256123

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Zinc.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138566	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	alpha-Endosulfan (Endosulfan 1)
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 3.1 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 against 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 54 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:

Line of Evidence (LOE) for Decision ID 138566, alpha-Endosulfan (Endosulfan 1)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254622

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endosulfan I.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endosulfan I (alpha-endosulfan) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138566, alpha-Endosulfan (Endosulfan 1)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254532

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endosulfan I.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endosulfan I (alpha-endosulfan) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138566, alpha-Endosulfan (Endosulfan 1)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254511

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endosulfan I.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endosulfan I (alpha-endosulfan) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138582	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	beta-Endosulfan (Endosulfan 2)
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 3.1 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 against 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 0f 54 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:

Line of Evidence (LOE) for Decision ID 138582, beta-Endosulfan (Endosulfan 2)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254376

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endosulfan II.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endosulfan II (beta-endosulfan) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138582, beta-Endosulfan (Endosulfan 2)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254492

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endosulfan II.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endosulfan II (beta-endosulfan) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138582, beta-Endosulfan (Endosulfan 2)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

254468

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Endosulfan II.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endosulfan II (beta-endosulfan) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-08-11

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138585	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	pH
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 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. 1 line of evidence is available in the administrative record to assess this pollutant. 20 of 1250 samples exceeded the OBJECTIVE. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 20 of 1250 samples exceeded the OBJECTIVE and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board 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:

Line of Evidence (LOE) for Decision ID 138585, pH	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86208

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

539

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Ten of the 539 samples exceeded the objective.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Lake D, Lake H, and Lake I.

Temporal Representation:

Samples were collected approximately once a week from January 2006 to May 2010.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 138585, pH	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255563

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

237

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 2 of 237 samples exceeded the water quality threshold for pH.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Los Angeles Basin: the pH for inland surface waters, bays, or estuaries shall not be depressed below 6.5 or raised above 8.5 as a result of waste discharges.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-14 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138585, pH	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255478

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

237

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 4 of 237 samples exceeded the water quality threshold for pH.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Los Angeles Basin: the pH for inland surface waters, bays, or estuaries shall not be depressed below 6.5 or raised above 8.5 as a result of waste discharges.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-14 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138585, pH	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255427

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

237

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 4 of 237 samples exceeded the water quality threshold for pH.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 4.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Los Angeles Basin: the pH for inland surface waters, bays, or estuaries shall not be depressed below 6.5 or raised above 8.5 as a result of waste discharges.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-14 and 2020-10-13

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	138587	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Selenium
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	See TMDL documentation
TMDL Name:	Los Angeles River Metals (13)
TMDL Project Code:	237
Date TMDL Approved by USEPA:	10/29/2008
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. One line of evidence is available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification 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. 104 of 314samples 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:

Line of Evidence (LOE) for Decision ID 138587, Selenium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255936

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

104

Number of Exceedances:

101

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 101 of 104 samples exceeded the water quality threshold for Selenium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775457 (RSW-LATT612(I)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-10-06

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138587, Selenium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255778

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

105

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 2 of 105 samples exceeded the water quality threshold for Selenium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775464 (RSW-LATT622(D)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-10-06

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program

Line of Evidence (LOE) for Decision ID 138587, Selenium	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

255940

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

105

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Donald C. Tillman WWRP data for Los Angeles River Reach 5 ( within Sepulveda Basin) to determine beneficial use support and results are as follows: 1 of 105 samples exceeded the water quality threshold for Selenium.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775473 (RSW-LATT628(W-E)).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2020-10-06

Environmental Conditions:

QAPP Information:

Los Angeles & San Gabriel Rivers Watershed Council. 2010. Los Angeles River Watershed-Wide Monitoring Program.

QAPP Information Reference(s):

Los Angeles River Watershed-Wide Monitoring Program


DECISION ID	70683	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Scum/Foam-unnatural
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)(2016)
Revision Status	Original
Reason for Delisting:	Applicable WQS attained; due to restoration activities
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 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. One line of evidence is available in the administrative record to assess this water body condition. A nitrogen TMDL has been developed and approved by USEPA and an approved implementation plan is expected to result in attainment of the nitrogen standard. Qualitative information on scum/foam-unnatural alone is not sufficient to support placement on the section 303(d) list (Listing Policy section 3.7). It is expected that this TMDL will address the pollutant(s) contributing to or causing these conditions. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of removing this water segment-pollutant combination from the section 303(d) list.

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

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.

Line of Evidence (LOE) for Decision ID 70683, Scum/Foam-unnatural	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2523

Pollutant:

Scum/Foam-unnatural

LOE Subgroup:

Narrative Description Data

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

A TMDL and implementation plan has been approved for this water segment-pollutant combination. The Los Angeles River Nitrogen TMDL was approved by RWQCB on August 19, 2003 and subsequently approved by USEPA on March 18, 2004. This TMDL will address this water body condition.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):


DECISION ID	71917	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Taste and odor
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)(2016)
Revision Status	Original
Reason for Delisting:	Flaws in original listing
Impairment from Pollutant or Pollution:	Pollution

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. One line of evidence is available in the administrative record to assess this water body condition. A nitrogen TMDL has been developed and approved by USEPA and an approved implementation plan is expected to result in attainment of the nitrogen standard. Qualitative information on taste and odor alone is not sufficient to support placement on the section 303(d) list (Listing Policy section 3.7). It is expected that this TMDL will address the pollutant(s) contributing to or causing this condition.

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

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.

Line of Evidence (LOE) for Decision ID 71917, Taste and odor	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2522

Pollutant:

Taste and odor

LOE Subgroup:

Narrative Description Data

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):


DECISION ID	90493	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Lead
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2016)
Revision Status	Original
Sources:	A Source Unknown
TMDL Name:	Los Angeles River Metals (13)
TMDL Project Code:	237
Date TMDL Approved by USEPA:	12/22/2005
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 4.1 of the Listing Policy. Under section 4.1 a single line of evidence are necessary to assess listing status. 2 lines of evidence are available in the administrative record to assess this pollutant. 0 of the 12 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 insufficient 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 12, 0 of 0 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 28 samples is needed to determine if a beneficial use is fully supported using table 4.1. 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 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:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 90493, Lead	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2528

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a listing decision made by USEPA for 2006.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 90493, Lead	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86197

Pollutant:

Lead

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the twelve samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for lead is 128 mg/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	97041	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Anthracene
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)(2016)
Revision Status	Original
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 3.6 of the Listing Policy. Under section 3.6 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 8 samples exceeded the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0of 8 samples exceeded the GUIDELINE 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:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 97041, Anthracene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86172

Pollutant:

Anthracene

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for anthracene is 845 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	97097	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Benzo(a)anthracene
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)(2016)
Revision Status	Original
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 3.6 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 line of evidence is available in the administrative record to assess this pollutant. 0 of 8 samples exceed the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is INSUFFICIENT justification FOR placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 8 samples exceed the GUIDELINE and this sample size is INSUFFICIENT to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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 this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 97097, Benzo(a)anthracene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86174

Pollutant:

Benzo(a)anthracene

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for benzo(a)anthracene is 1,050 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	97098	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Benzo(a)pyrene
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)(2016)
Revision Status	Original
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 3.6 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 line of evidence is available in the administrative record to assess this pollutant. 0 of 8 samples exceed the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is INSUFFICIENT justification FOR placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 8 samples exceed the GUIDELINE and this sample size is INSUFFICIENT to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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 this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 97098, Benzo(a)pyrene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86175

Pollutant:

Benzo(a)pyrene

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for benzo(a)pyrene is 1,450 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	68677	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	ChemA
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None of the samples exceed the NAS guidelines. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the 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.None of the one sample exceeded the NAS guidelines and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. 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:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

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.

Line of Evidence (LOE) for Decision ID 68677, ChemA	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2525

Pollutant:

ChemA

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fish tissue analysis

Data Used to Assess Water Quality:

1 tissue sample, 0 samples exceeding. This water body-pollutant was listed
on the 1996 303 (d) list in error by the RWQCB. The Chem A in this
tissue sample collected in 1992 did not exceed the NAS Chem A guideline. (SWRCB, 2003a).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

NAS guidelines are applicable to Aquatic Life. They are applicable to use for evaluation of tissue.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

One site.

Temporal Representation:

One time sample.

Environmental Conditions:

Data age is 10 years old.

QAPP Information:

Not documented.

QAPP Information Reference(s):


DECISION ID	69456	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Chlorpyrifos
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None of the samples exceed the water quality objective because EDLs are not an applicable assessment guidelines. . Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the 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.No sample exceeded any water quality objective or guideline 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:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

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.

Line of Evidence (LOE) for Decision ID 69456, Chlorpyrifos	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2526

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Used Missing

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

EDLs are not an applicable assessment guidelines.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):


DECISION ID	97155	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Chrysene (C1-C4)
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)(2016)
Revision Status	Original
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 3.6 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 line of evidence is available in the administrative record to assess this pollutant. 0 of 8 samples exceed the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is INSUFFICIENT justification FOR placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 8 samples exceed the GUIDELINE and this sample size is INSUFFICIENT to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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 this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 97155, Chrysene (C1-C4)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86183

Pollutant:

Chrysene (C1-C4)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for chrysene is 1,290 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	97156	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	DDD (Dichlorodiphenyldichloroethane)
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)(2016)
Revision Status	Original
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 3.6 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 line of evidence is available in the administrative record to assess this pollutant. 0 of 8 samples exceed the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is INSUFFICIENT justification FOR placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 8 samples exceed the GUIDELINE and this sample size is INSUFFICIENT to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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 this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 97156, DDD (Dichlorodiphenyldichloroethane)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86185

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for sum of DDD is 28.0 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	97026	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
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)(2016)
Revision Status	Original
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 3.6 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 line of evidence is available in the administrative record to assess this pollutant. 0 of 8 samples exceed the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is INSUFFICIENT justification FOR placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 8 samples exceed the GUIDELINE and this sample size is INSUFFICIENT to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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 this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 97026, DDE (Dichlorodiphenyldichloroethylene)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86189

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

One of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for sum of DDE is 31.3 ug/Kg dry weight. Ref7

Guideline Reference:

Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuary sediments. Environmental Management. 19, (1): 81-97

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	97213	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Fluorene
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)(2016)
Revision Status	Original
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 3.6 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 line of evidence is available in the administrative record to assess this pollutant. 0 of 8 samples exceed the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is INSUFFICIENT justification FOR placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 8 samples exceed the GUIDELINE and this sample size is INSUFFICIENT to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 97213, Fluorene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86193

Pollutant:

Fluorene

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for fluorene is 536 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	97270	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Pyrene
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)(2016)
Revision Status	Original
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 3.6 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 line of evidence is available in the administrative record to assess this pollutant. 0 of 8 samples exceed the GUIDELINE. Based on the readily available data and information, the weight of evidence indicates that there is INSUFFICIENT justification FOR placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 0 of 8 samples exceed the GUIDELINE and this sample size is INSUFFICIENT to determine beneficial use support, with the power and confidence of the Listing Policy. 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.

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 this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 97270, Pyrene	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86212

Pollutant:

Pyrene

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for pyrene is 1,520 ug/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, semiannually in 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	94525	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Benthic Community Effects
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	A Source Unknown
Expected TMDL Completion Date:	2025
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Benthic Community Effects is being considered for placement on the CWA section 303(d) List under section 3.9 of the Listing Policy. Several lines of evidence are available in the administrative record to assess this pollutant. Both bioassessment samples collected had IBI scores below 40. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing Benthic Community Effects 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 the bioassessment samples collected had IBI scores below 40, indicating poor water quality. Additionally, the water body is impaired due to ammonia, copper, toxicity, and trash. Therefore, this water body segment meets the requirement of Section 3.9 of the listing policy for placement on the 303(d) List. 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:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 94525, Benthic Community Effects	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

96220

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Two samples were collected from Los Angeles River over two years. Two of the two samples collected had IBI scores below 40. The scores were 1 (2006), 4 (2007).

Data Reference:

Bioassessment Monitoring Report in Los Angeles County, 2006-2008.

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 or animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analysis of species diversity, population density, growth anomalies, bioassays of appropriate duration or other appropriate methods as specified by the State or Regional Board.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

The IBI is a multi-metric assessment that employs biological metrics that respond to a habitat or water quality impairment. Each of the biological metrics measured at a site are converted to an IBI score then summed. These cumulative scores are then ranked. For the Southern California IBI, sites with scores below 40 are considered to have impaired conditions.

Guideline Reference:

Development of a Benthic Index of Biotic Integrity (B-IBI) for Wadeable Streams in Northern Coastal California and its Application to Regional 305(b) Assessment

Spatial Representation:

The samples were collected from Los Angeles River upstream of Sepulveda Dam, station 13.

Temporal Representation:

The samples were collected in 2006 and 2007.

Environmental Conditions:

QAPP Information:

Qaulity assurance is good. Los Angeles County Department of Public Works (LACDPW) contracted Weston Solutions, Inc. to perform biological assessments. Sampling and analysis followed the protocols described in the California Stream Bioassessment Procedure (CSBP) (Harrington, 2003), and also incorporated the Southern California Index of Biotic Integrity (IBI) (Ode et al., 2005).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 94525, Benthic Community Effects	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

28081

Pollutant:

Trash

LOE Subgroup:

Narrative Description Data

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

A TMDL has been approved for this water segment-pollutant combination. The Trash TMDL for the Los Angeles River Watershed was adopted by the Los Angeles RWQCB on August 09, 2007 and subsequently approved by USEPA. The TMDL was been integrated into the Basin Plan as Attachment A of Regional Board Resolution No. 2007-012.

Data Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA information unavailable.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 94525, Benthic Community Effects	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86214

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Fifty-three samples were collected to evaluate water toxicity. Twenty-one of the 53 samples exhibited significant toxicity. The toxicity tests included acute and chronic toxicity. The species and methods used can be found in the NPDES permit CA0056227.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control.

Guideline Reference:

Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013

Spatial Representation:

The samples were collected at Los Angeles River Reach 5 Rec Lakes D, H, and I.

Temporal Representation:

The samples were collected from 2007-2010.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 94525, Benthic Community Effects	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2527

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a listing decision made by USEPA for 2006.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 94525, Benthic Community Effects	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86184

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the twelve samples exceeded the evaluation guideline.

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Sediment samples were collected at station R-2 (also referred to as W-D). Monitoring at this station has been discontinued per LARWMP.

Temporal Representation:

Samples were collected quarterly in 2006, 2007 and 2008.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 94525, Benthic Community Effects	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2520

Pollutant:

Ammonia

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):


DECISION ID	69757	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Oil
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	A Source Unknown
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.

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

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.

Line of Evidence (LOE) for Decision ID 69757, Oil	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

3915

Pollutant:

Oil

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

Unspecified

Guideline Reference:

Placeholder reference pre-2006 303(d)

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	97021	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Toxicity
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	A Source Unknown
Expected TMDL Completion Date:	2027
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 3.6 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status. 1 line of evidence is available in the administrative record to assess this pollutant. 21 of 53 samples exceeded the GUIDELINE. 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. 21 of 53 samples exceeded the GUIDELINE 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:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 97021, Toxicity	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

86214

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

Data from the Donald C. Tillman Water Reclamation Plant NPDES Permit no. CA0056227, Jan 2006-May 2010

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:

Guideline Reference:

Spatial Representation:

The samples were collected at Los Angeles River Reach 5 Rec Lakes D, H, and I.

Temporal Representation:

The samples were collected from 2007-2010.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	70501	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Nutrients (Algae)
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2016)
Revision Status	Original
Sources:	Nonpoint Source \| Point Source
TMDL Name:	Los Angeles River Nitrogen (11)
TMDL Project Code:	229
Date TMDL Approved by USEPA:	03/18/2004
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for listing under section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. A TMDL has been developed and approved by USEPA and an approved implementation plan is expected to result in attainment of the standard. The Los Angeles River Nitrogen TMDL was approved by RWQCB on August 19, 2003 and subsequently approved by USEPA on March 18, 2004. This TMDL will address this water body condition. 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 in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list.

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

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.

Line of Evidence (LOE) for Decision ID 70501, Nutrients (Algae)	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2521

Pollutant:

Nutrients (Algae)

LOE Subgroup:

Pollutant-Water

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):


DECISION ID	69326	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

Pollutant:	Trash
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2016)
Revision Status	Original
Sources:	Nonpoint Source \| Surface Runoff \| Urban Runoff/Storm Sewers
TMDL Name:	Los Angeles River Trash (12)
TMDL Project Code:	365
Date TMDL Approved by USEPA:	07/24/2008
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal on the section 303(d) list under sections 2.2 of the Listing Policy. Under 2.2 of the Policy, a minimum of one line of evidence is needed to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and adopted by the Los Angeles RWQCB and approved by USEPA, and is expected to result in attainment of the standard.

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

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.

Line of Evidence (LOE) for Decision ID 69326, Trash	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

2524

Pollutant:

Trash

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

The Los Angeles River Trash TMDL was completed on September 19, 2001(USEPA, 2002). However, on July 19, 2006 the State Board rescinded approval of the TMDL and remanded it back to the Regional Board based on a court ruling in City of Arcadia v. State Water Resources Control Board (D043877).Visual trash assessment-TMDL completed (SWRCB, 2003).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

Data was collected in the Los Angeles River Reach 5 at Sepulveda Basin.

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 69326, Trash	Region 4
Los Angeles River Reach 5 ( within Sepulveda Basin)

LOE ID:

28081

Pollutant:

Trash

LOE Subgroup:

Narrative Description Data

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA information unavailable.

QAPP Information Reference(s):