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 3 (Figueroa St. to Riverside Dr.)
Water Body ID:	CAR4052100019990202090157
Water Body Type:	River & Stream

DECISION ID	150444	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 3 is effluent from the Los Angeles-Glendale 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. The lines of evidence in Reach 3 assessed in a prior cycle showed 33 samples exceeded the water quality objective for ammonia in the period 2005 to 2007. All exceedances in these lines of evidence were prior to the 2007 installation of NDN processes at the water reclamation plants. After installation, 3 of 164 samples exceeded the ammonia objective. One line of evidence is available in the administrative record to assess this pollutant. 3 of the 164 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. 3 of 164 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 150444, Ammonia Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253598
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	36
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Ammonia 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 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 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 150444, Ammonia Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253599
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	36
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Ammonia 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 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 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 150444, Ammonia Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253294
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Ammonia 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 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-01-03 and 2017-04-18
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 150444, Ammonia Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85894
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	60
Number of Exceedances:	20
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	20 out of 60 monthly averages exceeded the site specific basin plan objective for total ammonia as nitrogen. All the exceedences were 2007 and prior.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 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 waterbody are based upon the presence of early life stages and found in Table 3-4. "Site-Specific 30-day Average Objectives for Ammonia by Waterbody Reach." Site specific objectives are applied as if early life stages are present (dates ranging April 1 to September 30).
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected in three locations: LAG R4, LAG R5, and LAG R7.
Temporal Representation:	Samples were collected weekly from 07/2005 through 06/2010. Only samples collected from the months of April 1 to September 30 have been included.
Environmental Conditions:
QAPP Information:	All 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 150444, Ammonia Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86019
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	51
Number of Exceedances:	13
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	13 out of 51 monthly averages exceeded the site specific basin plan objective for total ammonia as nitrogen. All exceedences occurred 2007 and prior.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	he 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 waterbody are based upon the presence of early life stages and found in Table 3-4. "Site-Specific 30-day Average Objectives for Ammonia by Waterbody Reach." Site specific objectives are applied as if early life stages are absent (dates ranging October 1 to March 31).
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected in three locations: LAG R4, LAG R5, and LAG R7.
Temporal Representation:	Samples were collected weekly from 07/2005 through 06/2010. Only samples collected from the months of October 1 to March 31 have been included.
Environmental Conditions:
QAPP Information:	All 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 150444, Ammonia Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2507
Pollutant:	Ammonia
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference:	Placeholder reference 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 150444, Ammonia Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253597
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	42
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 1 of 42 samples exceeded the water quality threshold for Ammonia 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 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-03-06 and 2016-11-30
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 150444, Ammonia Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253601
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	46
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 2 of 46 samples exceeded the water quality threshold for Ammonia 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 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-03-06 and 2017-04-25
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	150304	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Indicator Bacteria
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Name:	Los Angeles River Pathogens (15)
TMDL Project Code:	238
Date TMDL Approved by USEPA:	03/23/2012
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 4.3 and 4.11 of the Listing Policy. Under section 4.3 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 waterbody-pollutant combination. Because a statistically sufficient number of geomean samples were not available, attainment of the bacteria objective was determined based only on the STV per the situation-specific weight of evidence approach outlined in Sections 4.11 of the Listing Policy. 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. 19 of 37 samples exceeded the statistical threshold value for E. coli and these exceed the allowable frequency listed in Table 4.2 of the Listing Policy. 4. The Los Angeles River Bacteria TMDL was approved by USEPA on 03/23/2012. 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 150304, Indicator Bacteria Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	303193
Pollutant:	Escherichia coli (E. coli)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	STV
Beneficial Use:	Water Contact Recreation
Number of Samples:	36
Number of Exceedances:	19
Data and Information Type:	PATHOGEN MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed LA County MS4 data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and the results are as follows: 19 of the 36 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.
Data Reference:	WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The bacteria water quality objective to protect the REC-1 beneficial use where the salinity is less than 1 parts per thousand 95 percent or more of the time applies a statistical threshold value to E. coli of 320 cfu/100 mL, not to be exceeded by more than 10 percent of samples within a calendar month (ISWEBE 2018).
Objective/Criterion Reference:	Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s), station(s): LAR_03_FIG (Los Angeles River (Figueroa St)).
Temporal Representation:	The samples were collected between the days of 2015-11-18 and 2019-12-18 .
Environmental Conditions:
QAPP Information:	Municipal Separate Storm Sewer System (MS4)
QAPP Information Reference(s):	Municipal Separate Storm Sewer System (MS4)
Line of Evidence (LOE) for Decision ID 150304, Indicator Bacteria Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	302978
Pollutant:	Escherichia coli (E. coli)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	STV
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PATHOGEN MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed LA County MS4 data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.
Data Reference:	WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The bacteria water quality objective to protect the REC-1 beneficial use where the salinity is less than 1 parts per thousand 95 percent or more of the time applies a statistical threshold value to E. coli of 320 cfu/100 mL, not to be exceeded by more than 10 percent of samples within a calendar month (ISWEBE 2018).
Objective/Criterion Reference:	Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s), station(s): LAR_03_ZOO (Los Angeles River (Zoo Dr)).
Temporal Representation:	The samples were collected between the days of 2015-12-29 and 2015-12-29 .
Environmental Conditions:
QAPP Information:	Municipal Separate Storm Sewer System (MS4)
QAPP Information Reference(s):	Municipal Separate Storm Sewer System (MS4)
Line of Evidence (LOE) for Decision ID 150304, Indicator Bacteria Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86005
Pollutant:	Escherichia coli (E. coli)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	330
Number of Exceedances:	202
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Two hundred and two of the the 330 samples exceeded the E. coli objective.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The E. coli density shall not exceed 235/100 ml. (Water Quality Control Plan for the Los Angeles Region).
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:	Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
Spatial Representation:	The samples were collected at Los Angeles River R4, R5 and R7.
Temporal Representation:	The samples were collected once a week from 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. Los Angeles-Glendale Water Reclamation Plant NPDES permit no. CA0053953
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 150304, Indicator Bacteria Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86006
Pollutant:	Escherichia coli (E. coli)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	247
Number of Exceedances:	237
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Two hundred and thirty-seven of the the 247 geometric means exceeded the E. coli objective.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The E. coli density shall not exceed 126/100 ml. (Water Quality Control Plan for the Los Angeles Region).
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:	Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
Spatial Representation:	The samples were collected at Los Angeles River R4, R5 and R7.
Temporal Representation:	The samples were collected once a week from 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. Los Angeles-Glendale Water Reclamation Plant NPDES permit no. CA0053953
QAPP Information Reference(s):

DECISION ID	138500	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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:	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 6 and 0 of 36 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 138500, 1,1,2-Trichloroethane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85990
Pollutant:	1,1,2-Trichloroethane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	6
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	All of the samples were below criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA National Recomm. WQ criteria, chronic tox info, is 9,400 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, two samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138500, 1,1,2-Trichloroethane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256100
Pollutant:	1,1,2-Trichloroethane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 11 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138500, 1,1,2-Trichloroethane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256300
Pollutant:	1,1,2-Trichloroethane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138500, 1,1,2-Trichloroethane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256133
Pollutant:	1,1,2-Trichloroethane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138500, 1,1,2-Trichloroethane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256290
Pollutant:	1,1,2-Trichloroethane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138500, 1,1,2-Trichloroethane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256103
Pollutant:	1,1,2-Trichloroethane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	9
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 9 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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	138475	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 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 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 138475, 2,4-D (2,4-Dichlorophenoxy acetic acid) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254390
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:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The evaluation guideline for 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138475, 2,4-D (2,4-Dichlorophenoxy acetic acid) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254410
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:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The evaluation guideline for 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138475, 2,4-D (2,4-Dichlorophenoxy acetic acid) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	260543
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:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Dichlorophenoxyacetic Acid, 2,4-.
Data Reference:	WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The evaluation guideline for 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: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	The samples were collected between the dates of 2015-06-03 and 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern
Line of Evidence (LOE) for Decision ID 138475, 2,4-D (2,4-Dichlorophenoxy acetic acid) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254481
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:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The evaluation guideline for 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138475, 2,4-D (2,4-Dichlorophenoxy acetic acid) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254478
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:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The evaluation guideline for 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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 138475, 2,4-D (2,4-Dichlorophenoxy acetic acid) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254437
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:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The evaluation guideline for 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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	138495	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	2-Methyl-4-chlorophenoxyacetic acid (MCPA):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:	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 138495, 2-Methyl-4-chlorophenoxyacetic acid (MCPA):acetic acid Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	263215
Pollutant:	2-Methyl-4-chlorophenoxyacetic acid (MCPA):acetic acid
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for MCPA.
Data Reference:	WQ data from the California Environmental Data Exchange Network 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 2-methyl-4-chlorophenoxyacetic acid (MCPA):acetic acid is the USEPA Aquatic Life Benchmark of 20 ug/L for a vascular plant (acute) for MCPA EHE.
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	The samples were collected between the dates of 2015-06-03 and 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138497	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Acrolein
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 138497, Acrolein Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253504
Pollutant:	Acrolein
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA recommended acrolein criterion for the protection of aquatic life in freshwater is 3 ug/L ( 4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 138497, Acrolein Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85991
Pollutant:	Acrolein
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	All of the samples were below criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA National Recomm. WQ criteria, 4-day avg. is 3 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138497, Acrolein Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253398
Pollutant:	Acrolein
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA recommended acrolein criterion for the protection of aquatic life in freshwater is 3 ug/L ( 4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 138497, Acrolein Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253355
Pollutant:	Acrolein
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 11 samples were collected, 11 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: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA recommended acrolein criterion for the protection of aquatic life in freshwater is 3 ug/L ( 4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 138497, Acrolein Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253486
Pollutant:	Acrolein
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 2 samples were collected, 2 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: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA recommended acrolein criterion for the protection of aquatic life in freshwater is 3 ug/L ( 4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 138497, Acrolein Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253375
Pollutant:	Acrolein
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 9 samples were collected, 9 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: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA recommended acrolein criterion for the protection of aquatic life in freshwater is 3 ug/L ( 4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-08-04
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	138499	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Aldrin
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. 1 line of evidence is available in the administrative record to assess this pollutant. 0 of 34 samples exceed the guideline. 0 of 24 samples exceeded the guideline. 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 24 and 0 of 34 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 138499, Aldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253358
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138499, Aldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253359
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138499, Aldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253378
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138499, Aldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253311
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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 138499, Aldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253334
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138499, Aldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85992
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	24
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	All of the samples were below criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The California Toxics Rule, instantaneous max. is 1.5 ug/L.
Guideline 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
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):

DECISION ID	138450	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 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 66 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 138450, Antimony Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253518
Pollutant:	Antimony
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)
Guideline Reference:	Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.
Spatial Representation:	The samples were collected at 1 monitoring site: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138450, Antimony Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253542
Pollutant:	Antimony
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)
Guideline Reference:	Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.
Spatial Representation:	The samples were collected at 1 monitoring site: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138450, Antimony Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253561
Pollutant:	Antimony
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)
Guideline Reference:	Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138450, Antimony Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253408
Pollutant:	Antimony
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)
Guideline Reference:	Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138450, Antimony Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253515
Pollutant:	Antimony
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Antimony.
Data Reference:	WQ data from the 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 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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	138451	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 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 66 and 0 of 46 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 138451, Arsenic Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85993
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	46
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the 46 samples exceeded the CTR.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The CTR for arsenic is 150 ug/L.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138451, Arsenic Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253438
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic.
Data Reference:	WQ data from the 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138451, Arsenic Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253476
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138451, Arsenic Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253458
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138451, Arsenic Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253546
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138451, Arsenic Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253349
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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	138465	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 138465, Azinphos-methyl (Guthion) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253285
Pollutant:	Azinphos-methyl (Guthion)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 to 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 138465, Azinphos-methyl (Guthion) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253283
Pollutant:	Azinphos-methyl (Guthion)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 11 samples were collected, 11 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 138465, Azinphos-methyl (Guthion) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253306
Pollutant:	Azinphos-methyl (Guthion)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 to 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 138465, Azinphos-methyl (Guthion) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253264
Pollutant:	Azinphos-methyl (Guthion)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 2 samples were collected, 2 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 138465, Azinphos-methyl (Guthion) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253265
Pollutant:	Azinphos-methyl (Guthion)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 9 samples were collected, 9 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-11-03
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	138452	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 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 66 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 138452, Beryllium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253926
Pollutant:	Beryllium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	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 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138452, Beryllium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253798
Pollutant:	Beryllium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138452, Beryllium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253864
Pollutant:	Beryllium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138452, Beryllium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253617
Pollutant:	Beryllium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	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 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138452, Beryllium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253882
Pollutant:	Beryllium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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	138496	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Bifenthrin
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 138496, Bifenthrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	257707
Pollutant:	Bifenthrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Bifenthrin. Although a total of 1 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 Environmental Data Exchange Network 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 chronic criterion for bifenthrin is 0.1 ng/L (expressed as a 4-day average).  If the freely dissolved concentrations of bifenthrin were reported or could be calculated then these values were used for this assessment.  In the absence of freely dissolved concentrations, total concentrations were used.
Guideline Reference:	Water Quality Criteria Report for Bifenthrin
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	Data for this waterbody were collected over the date range 2015-06-03 to 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138453	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. 2 lines of evidence are available in the administrative record to assess this pollutant. 0 of 66 samples exceeded the CRITERIA. 0 of 95 samples exceeded 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 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 66 and 0 of 95 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 138453, Cadmium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85995
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	95
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	All of the samples were below criteria. (Total recoverable cadmium was analyzed for.)
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The California Toxics Rule (USEPA), 4-day avg., dissolved, is 2.2 ug/L.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138453, Cadmium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253929
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138453, Cadmium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253954
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138453, Cadmium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253684
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138453, Cadmium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253928
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138453, Cadmium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253603
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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	138454	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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:	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 138454, Chlordane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255931
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	6
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 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 chlordane criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0043 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (833670).
Temporal Representation:	Data for this waterbody was collected over the date range 2017-08-01 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 138454, Chlordane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255910
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	6
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 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 chlordane criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0043 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (833667).
Temporal Representation:	Data for this waterbody was collected over the date range 2017-08-01 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 138454, Chlordane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255933
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. Although a total of 10 samples were collected, 10 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:	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: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 138454, Chlordane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255932
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. Although a total of 2 samples were collected, 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 138454, Chlordane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85996
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	All of the samples were below the reporting limit, which was above criteria. Therefore, non of the samples can be used with confidence.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The CTR CCC for Chlordane is 0.0043 ug/L.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138454, Chlordane Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255994
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. Although a total of 8 samples were collected, 8 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:	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: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-08-04
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	138455	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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. 0 of 66 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 138455, Chloride Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243905
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 14 samples exceed the criterion 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:	The Water Quality Control Plan for the Los Angeles Region list a site specific objective for Chloride in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 190 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-LAGT654(a) (34.13, -118.27314), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 5/2/2017 - 8/11/2020, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138455, Chloride Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243896
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 14 samples exceed the criterion 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:	The Water Quality Control Plan for the Los Angeles Region list a site specific objective for Chloride in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 190 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-LAGT650 (34.1377, -118.27532), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 5/2/2017 - 8/11/2020, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138455, Chloride Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243892
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 2 samples exceed the criterion 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:	The Water Quality Control Plan for the Los Angeles Region list a site specific objective for Chloride in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 190 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-654(a) (34.13, -118.27314), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 12/6/2016 - 2/16/2017, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138455, Chloride Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243883
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 17 samples exceed the criterion 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:	The Water Quality Control Plan for the Los Angeles Region list a site specific objective for Chloride in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 190 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-654 (34.122833, -118.27045), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 2/7/2012 - 11/15/2016, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138455, Chloride Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243873
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 19 samples exceed the criterion 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:	The Water Quality Control Plan for the Los Angeles Region list a site specific objective for Chloride in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 190 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-650 (34.134833, -118.274533), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 2/7/2012 - 2/16/2017, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program

DECISION ID	138456	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 138456, Chlorine Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253670
Pollutant:	Chlorine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 214 samples were collected, 214 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-04-25
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 138456, Chlorine Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253689
Pollutant:	Chlorine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 17 samples were collected, 17 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-04-25
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 138456, Chlorine Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253667
Pollutant:	Chlorine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 169 samples were collected, 169 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-05-02 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 138456, Chlorine Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253650
Pollutant:	Chlorine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 169 samples were collected, 169 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-05-02 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 138456, Chlorine Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253612
Pollutant:	Chlorine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 197 samples were collected, 197 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2016-11-30
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	138504	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Chromium
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 66 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 138504, Chromium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254079
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138504, Chromium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253613
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium.
Data Reference:	WQ data from the 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138504, Chromium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253636
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138504, Chromium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253634
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138504, Chromium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254075
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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	138457	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Chromium, hexavalent
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 66 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 138457, Chromium, hexavalent Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254062
Pollutant:	Chromium, hexavalent
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality threshold for Chromium VI.
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 (VI) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 11 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138457, Chromium, hexavalent Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254110
Pollutant:	Chromium, hexavalent
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium VI.
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 (VI) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 11 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138457, Chromium, hexavalent Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254154
Pollutant:	Chromium, hexavalent
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Chromium VI.
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 (VI) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 11 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138457, Chromium, hexavalent Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254010
Pollutant:	Chromium, hexavalent
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality threshold for Chromium VI.
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 (VI) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 11 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138457, Chromium, hexavalent Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254082
Pollutant:	Chromium, hexavalent
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality threshold for Chromium VI.
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 (VI) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 11 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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	138458	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Chromium, trivalent
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 63 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 138458, Chromium, trivalent Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254220
Pollutant:	Chromium, trivalent
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	13
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Chromium III.
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 hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 180 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138458, Chromium, trivalent Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254197
Pollutant:	Chromium, trivalent
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium III.
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 hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 180 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138458, Chromium, trivalent Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254242
Pollutant:	Chromium, trivalent
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Chromium III.
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 hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 180 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138458, Chromium, trivalent Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254221
Pollutant:	Chromium, trivalent
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality threshold for Chromium III.
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 hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 180 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138458, Chromium, trivalent Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254216
Pollutant:	Chromium, trivalent
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	12
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Chromium III.
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 hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 180 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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	138459	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Cyanide
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. 4 of 66 and 1 of 95 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 138459, Cyanide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85998
Pollutant:	Cyanide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	95
Number of Exceedances:	1
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	One of the ninty-five samples exceeded the evaluation guideline.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) for cyanide of 5.2 ug/L to protect aquatic life in freshwater.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138459, Cyanide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254090
Pollutant:	Cyanide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 2 of 19 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138459, Cyanide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254092
Pollutant:	Cyanide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 1 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138459, Cyanide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254111
Pollutant:	Cyanide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138459, Cyanide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254067
Pollutant:	Cyanide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 1 of 17 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138459, Cyanide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254207
Pollutant:	Cyanide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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	138501	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Cyfluthrin
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 138501, Cyfluthrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	259251
Pollutant:	Cyfluthrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cyfluthrin. Although a total of 1 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 Environmental Data Exchange Network 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 chronic criterion for cyfluthrin is 0.2 ng/L (expressed as a 4-day average).  If the freely dissolved concentrations of cyfluthrin were reported or could be calculated then these values were used for this assessment.  In the absence of freely dissolved concentrations, total concentrations were used.
Guideline Reference:	Water Quality Criteria Report for Cyfluthrin
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	Data for this waterbody were collected over the date range 2015-06-03 to 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138503	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Cyhalothrin, Lambda
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 138503, Cyhalothrin, Lambda Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	262587
Pollutant:	Cyhalothrin, Lambda
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lambda-cyhalothrin. Although a total of 1 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 Environmental Data Exchange Network 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 chronic criterion for lambda-cyhalothrin is 0.3 ng/L (expressed as a 4-day average).  If the freely dissolved concentrations of lambda-cyhalothrin were reported or could be calculated then these values were used for this assessment.  In the absence of freely dissolved concentrations, total concentrations were used.
Guideline Reference:	Water Quality Criteria Report for Lambda-cyhalothrin
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	Data for this waterbody were collected over the date range 2015-06-03 to 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	149695	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 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. 1 line of evidence is available in the administrative record to assess this pollutant. 0 of 23 samples exceed the guideline. 0 of 0 samples exceed the criteria. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for not 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 23 samples exceed the guideline for DDT 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. 0 of 0 samples exceed the criteria for DDT in water and this is insufficient to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. 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 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 149695, DDT (Dichlorodiphenyltrichloroethane) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254213
Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 149695, DDT (Dichlorodiphenyltrichloroethane) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254189
Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 2 samples were collected, 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 149695, DDT (Dichlorodiphenyltrichloroethane) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254261
Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 149695, DDT (Dichlorodiphenyltrichloroethane) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254192
Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 10 samples were collected, 10 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:	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: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 149695, DDT (Dichlorodiphenyltrichloroethane) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86001
Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	23
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the twenty three samples exceeded the evaluation guideline.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 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 LA River R4, LA River R5 and LA River R7.
Temporal Representation:	Samples were collected in 2006 on February 7 and August 2, and in 2007 on February 7.
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 149695, DDT (Dichlorodiphenyltrichloroethane) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254121
Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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:	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: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-08-04
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	138502	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Deltamethrin
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 138502, Deltamethrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	260250
Pollutant:	Deltamethrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 1 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 Environmental Data Exchange Network 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 deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	Data for this waterbody were collected over the date range 2015-06-03 to 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138505	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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:	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 138505, Demeton Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254300
Pollutant:	Demeton
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Demeton, Total. Although a total of 8 samples were collected, 8 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 to 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 138505, Demeton Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253959
Pollutant:	Demeton
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Demeton, Total. Although a total of 8 samples were collected, 8 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 to 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 138505, Demeton Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254301
Pollutant:	Demeton
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Demeton, Total. Although a total of 2 samples were collected, 2 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 138505, Demeton Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253960
Pollutant:	Demeton
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 9 samples were collected, 2 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site (770470).
Temporal Representation:	Data for this waterbody was collected over the date range 2012-02-07 to 2015-11-03
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 138505, Demeton Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254003
Pollutant:	Demeton
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 11 samples were collected, 4 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site (770468).
Temporal Representation:	Data for this waterbody was collected over the date range 2012-02-07 to 2017-02-16
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	138461	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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. 0 of 36 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 138461, Diazinon Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254585
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Diazinon. Although a total of 20 samples were collected, 20 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: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-05-02 to 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 138461, Diazinon Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254539
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Diazinon. Although a total of 20 samples were collected, 20 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-05-02 to 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 138461, Diazinon Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254474
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Diazinon. Although a total of 3 samples were collected, 3 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: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-03-15
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 138461, Diazinon Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254563
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	18
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and the results are as follows: 0 of the 18 samples exceeded the water quality threshold for Diazinon. Although a total of 26 samples were collected, 8 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 (770468).
Temporal Representation:	Data for this waterbody was collected over the date range 2012-04-17 to 2017-03-15
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 138461, Diazinon Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254561
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	18
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and the results are as follows: 0 of the 18 samples exceeded the water quality threshold for Diazinon. Although a total of 23 samples were collected, 5 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 (770470).
Temporal Representation:	Data for this waterbody was collected over the date range 2012-04-17 to 2015-11-24
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	138493	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Dicamba
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 138493, Dicamba Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	260495
Pollutant:	Dicamba
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Dicamba.
Data Reference:	WQ data from the California Environmental Data Exchange Network 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 dicamba is the USEPA Aquatic Life Benchmark of 61 ug/L for a nonvascular plant (acute) for Dicamba acid.
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	The samples were collected between the dates of 2015-06-03 and 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138462	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 of 48 and 0 of 24 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 138462, Dieldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254570
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-06-20 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 138462, Dieldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254692
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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 138462, Dieldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254666
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138462, Dieldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254645
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-06-20 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 138462, Dieldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254620
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138462, Dieldrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86002
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	24
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	All of the samples were below criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The California Toxics Rule (USEPA), 4-day avg., is 0.056 ug/L.
Guideline 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
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):

DECISION ID	138463	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 34 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 138463, Endosulfan sulfate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254632
Pollutant:	Endosulfan sulfate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138463, Endosulfan sulfate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254656
Pollutant:	Endosulfan sulfate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138463, Endosulfan sulfate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254678
Pollutant:	Endosulfan sulfate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138463, Endosulfan sulfate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254605
Pollutant:	Endosulfan sulfate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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 138463, Endosulfan sulfate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254633
Pollutant:	Endosulfan sulfate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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	138464	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. 2 lines of evidence areavailable in the administrative record to assess this pollutant. 0 of 23 samples exceeded the CRITERIA. 0 of 34 samples exceeded 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 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 23 and 0 of 34 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 138464, Endrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254766
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138464, Endrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254765
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138464, Endrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254335
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138464, Endrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254333
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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 138464, Endrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86004
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	23
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 23 samples exceeded the water quality criteria/objective.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	California Toxic Rule criteria fresh aquatic life protection continuous concentration (4-day average)is 0.036 ug/L.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	A total of 23 samples were collected at sampling locations, LA RIVER R-4 (9 samples), LA River R-5 (5 samples) and LA River R-7 (9 samples).
Temporal Representation:	23 samples from 2006 - 2010 were collected. At LA RIVER R-4, two samples in 2006, two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected. At LA River R-5, two samples in 2006, two samples in 2007, and one sample in 2008 were collected. LA River R-7 two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected.
Environmental Conditions:	There was no special environmental conditions reported.
QAPP Information:	ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF SANITATION DEPARTMENT OF PUBLIC WORKS CITY OF LOS ANGELES submitted QUALITY ASSURANCE MANUAL (QA) dated December 2009. The Quality Assurance Manual documents the QA Program
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138464, Endrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254680
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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	138506	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Esfenvalerate/Fenvalerate
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 138506, Esfenvalerate/Fenvalerate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	261429
Pollutant:	Esfenvalerate/Fenvalerate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Esfenvalerate. Although a total of 1 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 Environmental Data Exchange Network 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 chronic criterion for esfenvalerate is 0.3 ng/L (expressed as a 4-day average).  If the freely dissolved concentrations of esfenvalerate were reported or could be calculated then these values were used for this assessment.  In the absence of freely dissolved concentrations, total concentrations were used.
Guideline Reference:	Water Quality Criteria Report for Esfenvalerate
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	Data for this waterbody were collected over the date range 2015-06-03 to 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138492	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Fipronil
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 138492, Fipronil Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	261806
Pollutant:	Fipronil
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Fipronil.
Data Reference:	WQ data from the California Environmental Data Exchange Network 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:	UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of fipronil does not exceed 0.0032 ug/L (3.2 ng/L) in the water column more than once every three years on average (Bower, et al. 2017).
Guideline Reference:	Water and Sediment Quality Criteria Report for Fipronil. Phase III: Application of the pesticide water and sediment quality criteria methodologies. Department of Environmental Toxicology, University of California, Davis.
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	The samples were collected between the dates of 2015-06-03 and 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138449	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Fipronil Desulfinyl
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 138449, Fipronil Desulfinyl Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	261792
Pollutant:	Fipronil Desulfinyl
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fipronil Desulfinyl.
Data Reference:	WQ data from the California Environmental Data Exchange Network 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 fipronil degradate fipronil desulfinyl is the USEPA Aquatic Life Benchmark of 0.54 ug/L for a fish (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	The samples were collected between the dates of 2015-06-03 and 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138507	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Fipronil Sulfide
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 138507, Fipronil Sulfide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	261891
Pollutant:	Fipronil Sulfide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fipronil Sulfide.
Data Reference:	WQ data from the California Environmental Data Exchange Network 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 fipronil degradate fipronil sulfide is the USEPA Aquatic Life Benchmark of 0.83 ug/L for a fish (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	The samples were collected between the dates of 2015-06-03 and 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138508	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Fipronil Sulfone
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 138508, Fipronil Sulfone Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	261762
Pollutant:	Fipronil Sulfone
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fipronil Sulfone.
Data Reference:	WQ data from the California Environmental Data Exchange Network 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 fipronil degradate fipronil sulfone is the USEPA Aquatic Life Benchmark of 0.037 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	The samples were collected between the dates of 2015-06-03 and 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138466	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Heptachlor
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 138466, Heptachlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86007
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	The reporting limit for the non-detect sample was 0.01 ug/L which is equal to the water quality objective, therefore these data are not of sufficient resolution to determine if water quality standards are being achieved.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Region 4 Basin Plan objective is "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:	California Toxic Rule criteria fresh aquatic life protection continuous concentration (4-day average)is 0.0038 ug/L.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	A total of 23 samples were collected at sampling locations, LA RIVER R-4 (9 samples), LA River R-5 (5 samples) and LA River R-7 (9 samples).
Temporal Representation:	23 samples from 2006 - 2010 were collected. At LA RIVER R-4, two samples in 2006, two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected. At LA River R-5, two samples in 2006, two samples in 2007, and one sample in 2008 were collected. LA River R-7 two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected.
Environmental Conditions:	There was no special environmental conditions reported.
QAPP Information:	ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF SANITATION DEPARTMENT OF PUBLIC WORKS CITY OF LOS ANGELES submitted QUALITY ASSURANCE MANUAL (QA) dated December 2009. The Quality Assurance Manual documents the QA Program
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138466, Heptachlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254707
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 10 samples were collected, 10 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:	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: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 138466, Heptachlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254734
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 138466, Heptachlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254921
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 138466, Heptachlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255007
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 2 samples were collected, 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 138466, Heptachlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254709
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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:	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: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-08-04
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	138467	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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:	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 138467, Heptachlor epoxide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86009
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	The reporting limit for the non-detect sample was 0.01 ug/L which is equal to the water quality objective, therefore these data are not of sufficient resolution to determine if water quality standards are being achieved.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Region 4 Basin Plan objective is "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:	California Toxic Rule criteria fresh aquatic life protection continuous concentration (4-day average)is 0.0038 ug/L.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	A total of 23 samples were collected at sampling locations, LA RIVER R-4 (9 samples), LA River R-5 (5 samples) and LA River R-7 (9 samples).
Temporal Representation:	23 samples from 2006 - 2010 were collected. At LA RIVER R-4, two samples in 2006, two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected. At LA River R-5, two samples in 2006, two samples in 2007, and one sample in 2008 were collected. LA River R-7 two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected.
Environmental Conditions:	There was no special environmental conditions reported.
QAPP Information:	ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF SANITATION DEPARTMENT OF PUBLIC WORKS CITY OF LOS ANGELES submitted QUALITY ASSURANCE MANUAL (QA) dated December 2009. The Quality Assurance Manual documents the QA Program
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138467, Heptachlor epoxide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254860
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 2 samples were collected, 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 138467, Heptachlor epoxide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254882
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 10 samples were collected, 10 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:	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: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 138467, Heptachlor epoxide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254774
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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:	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: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-08-04
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 138467, Heptachlor epoxide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254928
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 138467, Heptachlor epoxide Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254820
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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	138494	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Imidacloprid
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 138494, Imidacloprid Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	262387
Pollutant:	Imidacloprid
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Imidacloprid.
Data Reference:	WQ data from the California Environmental Data Exchange Network 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:	UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the 4-day average concentration of imidacloprid does not exceed 0.016 ug/L.
Guideline Reference:	Water Quality Criteria Report for Imidacloprid Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	The samples were collected between the dates of 2015-06-03 and 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138468	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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:	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 34 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 138468, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254857
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138468, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254855
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138468, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254768
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138468, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254817
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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 138468, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254852
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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	138469	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 138469, Malathion Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255261
Pollutant:	Malathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 11 samples were collected, 11 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: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 138469, Malathion Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255262
Pollutant:	Malathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 to 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 138469, Malathion Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255223
Pollutant:	Malathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 9 samples were collected, 9 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: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-11-03
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 138469, Malathion Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255180
Pollutant:	Malathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 2 samples were collected, 2 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: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 138469, Malathion Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255181
Pollutant:	Malathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 to 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	150108	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 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 66 and 0 of 95 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 150108, Mercury Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86011
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	95
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the 95 samples exceeded the evaluation guideline.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to elemental mercury is 0.77 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 150108, Mercury Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255309
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	National Recommended Water Quality Criteria Continuous Concentration (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 150108, Mercury Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255096
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	National Recommended Water Quality Criteria Continuous Concentration (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 150108, Mercury Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255331
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	National Recommended Water Quality Criteria Continuous Concentration (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 150108, Mercury Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255122
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	National Recommended Water Quality Criteria Continuous Concentration (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 150108, Mercury Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255249
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	National Recommended Water Quality Criteria Continuous Concentration (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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	138470	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Methoxychlor
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. 2 lines of evidence are available in the administrative record to assess this pollutant. 0 of 23 samples exceeded the CRITERIA. 0 of 34 samples exceeded 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 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 23 and 0 of 34 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 138470, Methoxychlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255359
Pollutant:	Methoxychlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138470, Methoxychlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255041
Pollutant:	Methoxychlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 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:	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 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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 138470, Methoxychlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255357
Pollutant:	Methoxychlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138470, Methoxychlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255105
Pollutant:	Methoxychlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138470, Methoxychlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255101
Pollutant:	Methoxychlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 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:	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 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138470, Methoxychlor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86012
Pollutant:	Methoxychlor
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	23
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 23 samples exceeded the water quality criteria/objective.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Los Angeles Region Basin Plan states "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 Nationally Recommended Criteria for fresh aquatic life protection continuous concentration (4-day average)is 0.03 ug/L.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	A total of 23 samples were collected at sampling locations, LA RIVER R-4 (9 samples), LA River R-5 (5 samples) and LA River R-7 (9 samples).
Temporal Representation:	23 samples from 2006 - 2010 were collected. At LA RIVER R-4, two samples in 2006, two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected. At LA River R-5, two samples in 2006, two samples in 2007, and one sample in 2008 were collected. LA River R-7 two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected.
Environmental Conditions:	There was no special environmental conditions reported.
QAPP Information:	ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF SANITATION DEPARTMENT OF PUBLIC WORKS CITY OF LOS ANGELES submitted QUALITY ASSURANCE MANUAL (QA) dated December 2009. The Quality Assurance Manual documents the QA Program
QAPP Information Reference(s):

DECISION ID	138471	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Mirex
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. 2 lines of evidence are available in the administrative record to assess this pollutant. 0 of 0 samples exceeded the CRITERIA. 0 of 23 samples exceeded 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 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 0 and 0 of 23 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 138471, Mirex Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255233
Pollutant:	Mirex
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 10 samples were collected, 10 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 138471, Mirex Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86016
Pollutant:	Mirex
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	23
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 23 samples exceeded the water quality criteria/objective.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	California Toxic Rule criteria fresh aquatic life protection maximum concentration (instantaneous) is 0.001 ug/L.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	A total of 23 samples were collected at sampling locations, LA RIVER R-4 (9 samples), LA River R-5 (5 samples) and LA River R-7 (9 samples).
Temporal Representation:	23 samples from 2006 - 2010 were collected. At LA RIVER R-4, two samples in 2006, two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected. At LA River R-5, two samples in 2006, two samples in 2007, and one sample in 2008 were collected. LA River R-7 two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected.
Environmental Conditions:	There was no special environmental conditions reported.
QAPP Information:	ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF SANITATION DEPARTMENT OF PUBLIC WORKS CITY OF LOS ANGELES submitted QUALITY ASSURANCE MANUAL (QA) dated December 2009. The Quality Assurance Manual documents the QA Program
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138471, Mirex Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255272
Pollutant:	Mirex
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 138471, Mirex Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255234
Pollutant:	Mirex
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 138471, Mirex Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255275
Pollutant:	Mirex
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-08-04
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 138471, Mirex Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255293
Pollutant:	Mirex
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 2 samples were collected, 2 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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	138472	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 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 34 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 138472, Naphthalene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255318
Pollutant:	Naphthalene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138472, Naphthalene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255337
Pollutant:	Naphthalene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138472, Naphthalene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255360
Pollutant:	Naphthalene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138472, Naphthalene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255059
Pollutant:	Naphthalene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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 138472, Naphthalene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255061
Pollutant:	Naphthalene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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	138473	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 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 66 and 0 of 46 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 138473, Nickel Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255222
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel.
Data Reference:	WQ data from the 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138473, Nickel Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255236
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138473, Nickel Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255345
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138473, Nickel Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255155
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138473, Nickel Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86017
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	46
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the 46 samples exceeded the hardness adjusted criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a value of 100 mg/L was used.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138473, Nickel Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255346
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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	138474	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	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. 3 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 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 16, 0n of 420 and 0 of 398 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 138474, Nitrate/Nitrite (Nitrite + Nitrate as N) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243906
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	121
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 121 samples exceed the criterion for Nitrate + Nitrite 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 list a site specific objective for Nitrate + Nitrite as N in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 8 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-LAGT654(a) (34.13, -118.27314), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 5/30/2017 -10/13/2020, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138474, Nitrate/Nitrite (Nitrite + Nitrate as N) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243902
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	126
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 126 samples exceed the criterion for Nitrate + Nitrite 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 list a site specific objective for Nitrate + Nitrite as N in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 8 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-LAGT650 (34.1377, -118.27532), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 5/30/2017 -10/13/2020, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138474, Nitrate/Nitrite (Nitrite + Nitrate as N) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243951
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles County MS4 Permit to determine beneficial use support. The results are as follows: 0 out of 8 samples exceed the criterion for Nitrate + Nitrite as N.
Data Reference:	WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan for the Los Angeles Region gives a site specific objective for Nitrate + Nitrite as N in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 8 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station LAR_03_ZOO (34.155683, -118.28127), located in Los Angeles River (Zoo Dr).
Temporal Representation:	The water samples were taken between 1/20/2016 - 8/13/2019, per the monitoring requirements listed in the Los Angeles County Municipal Separate Storm Sewer Permit.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the provisions of the Los Angeles Municipal Separate Storm Sewer System quality control and quality assurance procedures listed in coordinated integrated monitoring plan.
QAPP Information Reference(s):	Municipal Separate Storm Sewer System (MS4)
Line of Evidence (LOE) for Decision ID 138474, Nitrate/Nitrite (Nitrite + Nitrate as N) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243950
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles County MS4 Permit to determine beneficial use support. The results are as follows: 0 out of 8 samples exceed the criterion for Nitrate + Nitrite as N.
Data Reference:	WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan for the Los Angeles Region gives a site specific objective for Nitrate + Nitrite as N in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 8 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station LAR_03_FIG (34.081249, -118.227546), located in Los Angeles River (Figueroa St).
Temporal Representation:	The water samples were taken between 1/20/2016 - 8/13/2019, per the monitoring requirements listed in the Los Angeles County Municipal Separate Storm Sewer Permit.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the provisions of the Los Angeles Municipal Separate Storm Sewer System quality control and quality assurance procedures listed in coordinated integrated monitoring plan.
QAPP Information Reference(s):	Municipal Separate Storm Sewer System (MS4)
Line of Evidence (LOE) for Decision ID 138474, Nitrate/Nitrite (Nitrite + Nitrate as N) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86018
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	398
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	0 of the 398 samples exceeded the objective for nitrate + nitrite. Sampling data for nitrate and nitrite were summed to determine whether sampling data met the water quality objectives.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan for the Los Angeles Region site specific objective for Nitrogen (Nitrate + Nitrite as N) in the Los Angeles River Reach 3 is 8 mg/L. From table 3-8 titled "Water Quality Objectives for Selected Constituents in Inland Surface Waters".
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected in three locations: LAG R4, LAG R5, and LAG R7.
Temporal Representation:	Samples were collected weekly from 07/2005 through 06/2010.
Environmental Conditions:
QAPP Information:	All 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 138474, Nitrate/Nitrite (Nitrite + Nitrate as N) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243880
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	95
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 95 samples exceed the criterion for Nitrate + Nitrite 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 list a site specific objective for Nitrate + Nitrite as N in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 8 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-650 (34.134833, -118.274533), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 2/15/2012 - 3/29/2017, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138474, Nitrate/Nitrite (Nitrite + Nitrate as N) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243884
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	71
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 71 samples exceed the criterion for Nitrate + Nitrite 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 list a site specific objective for Nitrate + Nitrite as N in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 8 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-654 (34.122833, -118.27045), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 2/22/2012 - 11/8/2016, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138474, Nitrate/Nitrite (Nitrite + Nitrate as N) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243893
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 7 samples exceed the criterion for Nitrate + Nitrite 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 list a site specific objective for Nitrate + Nitrite as N in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 8 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-654(a) (34.13, -118.27314), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 12/20/2016 -3/29/2017, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program

DECISION ID	149696	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 441 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 149696, Nitrogen, Nitrate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	302590
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	91
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 91 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-09 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 149696, Nitrogen, Nitrate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	302531
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed LA County MS4 data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Nitrate as N.
Data Reference:	WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan for the Los Angeles Region (page 3-34) states that: Waters shall not exceed 10 mg/L as nitrate-nitrogen (NO3-N).
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: LAR_03_FIG (Los Angeles River (Figueroa St)).
Temporal Representation:	The samples were collected between the dates of 2016-01-20 and 2019-08-13
Environmental Conditions:
QAPP Information:	Municipal Separate Storm Sewer System (MS4)
QAPP Information Reference(s):	Municipal Separate Storm Sewer System (MS4)
Line of Evidence (LOE) for Decision ID 149696, Nitrogen, Nitrate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	302585
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	121
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 121 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-04-25
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 149696, Nitrogen, Nitrate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	302591
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 11 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-13 and 2017-04-25
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 149696, Nitrogen, Nitrate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	302597
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	91
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 91 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-09 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 149696, Nitrogen, Nitrate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	302522
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed LA County MS4 data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Nitrate as N.
Data Reference:	WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan for the Los Angeles Region (page 3-34) states that: Waters shall not exceed 10 mg/L as nitrate-nitrogen (NO3-N).
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: LAR_03_ZOO (Los Angeles River (Zoo Dr)).
Temporal Representation:	The samples were collected between the dates of 2016-01-20 and 2019-08-13
Environmental Conditions:
QAPP Information:	Municipal Separate Storm Sewer System (MS4)
QAPP Information Reference(s):	Municipal Separate Storm Sewer System (MS4)
Line of Evidence (LOE) for Decision ID 149696, Nitrogen, Nitrate Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	302604
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	111
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 111 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-30
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	138476	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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. 1 of 61 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 138476, Organophosphate Pesticides Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255679
Pollutant:	Organophosphate Pesticides
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	22
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 24 samples were collected, 2 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 (770468).
Temporal Representation:	Data for this waterbody was collected over the date range 2012-04-17 to 2017-03-15
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 138476, Organophosphate Pesticides Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255678
Pollutant:	Organophosphate Pesticides
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	21
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and the results are as follows: 0 of the 21 samples exceeded the water quality threshold for Organophosphorus Pesticides. Although a total of 22 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 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 (770470).
Temporal Representation:	Data for this waterbody was collected over the date range 2012-04-17 to 2015-11-24
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 138476, Organophosphate Pesticides Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255677
Pollutant:	Organophosphate Pesticides
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the water quality threshold for Organophosphorus Pesticides. Although a total of 3 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 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 (829991).
Temporal Representation:	Data for this waterbody was collected over the date range 2016-12-06 to 2017-03-15
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 138476, Organophosphate Pesticides Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255656
Pollutant:	Organophosphate Pesticides
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and the results are as follows: 0 of the 8 samples exceeded the water quality threshold for Organophosphorus Pesticides. Although a total of 16 samples were collected, 8 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 (833670).
Temporal Representation:	Data for this waterbody was collected over the date range 2017-05-02 to 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 138476, Organophosphate Pesticides Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255550
Pollutant:	Organophosphate Pesticides
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and the results are as follows: 0 of the 8 samples exceeded the water quality threshold for Organophosphorus Pesticides. Although a total of 16 samples were collected, 8 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 (833667).
Temporal Representation:	Data for this waterbody was collected over the date range 2017-05-24 to 2020-05-27
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	151916	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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. Six lines of evidence are available in the administrative record to assess this pollutant. 5 of 967 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. 5 of 967 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 151916, Oxygen, Dissolved Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85895
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	542
Number of Exceedances:	3
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Numeric data generated from 542 averages of Dissolved Oxygen concentration had 3 exceedences.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 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 5mg/l.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected from the R-4, R-5, and R-7 monitoring locations.
Temporal Representation:	Samples were collected approximately once a week from July 2005 to June 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 151916, Oxygen, Dissolved Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	308179
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	91
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 91 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-09 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 151916, Oxygen, Dissolved Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	308006
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	121
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 121 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-04-25
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 151916, Oxygen, Dissolved Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	307856
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	91
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 1 of 91 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-09 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 151916, Oxygen, Dissolved Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	307802
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	111
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 1 of 111 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-30
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 151916, Oxygen, Dissolved Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	307830
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 11 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-13 and 2017-04-25
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	138481	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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:	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. 6 lines of evidence are available in the administrative record to assess this pollutant. 0 of 23 samples exceeded the CRITERIA. 0 of 23 samples exceeded the CRITERIA. 0 of 0 samples exceeded the CRITERIA. 0 of 0 samples exceeded the CRITERIA. 0 of 23 samples exceeded the CRITERIA. 0 of 0 samples exceeded 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 23, 0 of 23, 0 of 0, 0 of 0, 0 of 23 and 0 of 0 samples exceeded the CRITERIA and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to SECTION 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 138481, PCBs (Polychlorinated biphenyls) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85896
Pollutant:	PCB (Polychlorinated biphenyl)-1242
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	23
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	The reporting limits for all 23 of the non-detect samples were greater than the criteria, therefore were not used in this assessment.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The CTR for freshwater habitat, continuous concentration, is 0.014 ug/L for total PCBs.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138481, PCBs (Polychlorinated biphenyls) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85897
Pollutant:	PCB (Polychlorinated biphenyl)-1248
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	23
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	The reporting limits for all 23 of the non-detect samples were greater than the criteria, therefore were not used in this assessment.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The CTR for freshwater habitat, continuous concentration, is 0.014 ug/L for total PCBs.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138481, PCBs (Polychlorinated biphenyls) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85898
Pollutant:	PCB (Polychlorinated biphenyl)-1254
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	The reporting limits for all 23 of the non-detect samples were greater than the criteria, therefore were not used in this assessment.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The CTR for freshwater habitat, continuous concentration, is 0.014 ug/L for total PCBs.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138481, PCBs (Polychlorinated biphenyls) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85911
Pollutant:	PCB (Polychlorinated biphenyl)-1260
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	The reporting limits for all 23 of the non-detect samples were greater than the criteria, therefore were not used in this assessment.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The CTR for freshwater habitat, continuous concentration, is 0.014 ug/L for total PCBs.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138481, PCBs (Polychlorinated biphenyls) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85912
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	23
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the twenty three samples exceeded the evaluation guideline.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 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 LA River R4, LA River R5 and LA River R7.
Temporal Representation:	Samples were collected in 2006 on February 7 and August 2, and in 2007 on February 7.
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 138481, PCBs (Polychlorinated biphenyls) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255425
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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:	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: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-08-04
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 138481, PCBs (Polychlorinated biphenyls) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255447
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 2 samples were collected, 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 138481, PCBs (Polychlorinated biphenyls) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255683
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 10 samples were collected, 10 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:	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: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 138481, PCBs (Polychlorinated biphenyls) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255448
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 138481, PCBs (Polychlorinated biphenyls) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255723
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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	138478	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 138478, Parathion Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255531
Pollutant:	Parathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 2 samples were collected, 2 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 138478, Parathion Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255510
Pollutant:	Parathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 11 samples were collected, 11 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 138478, Parathion Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255532
Pollutant:	Parathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 to 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 138478, Parathion Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255444
Pollutant:	Parathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 9 samples were collected, 9 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-11-03
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 138478, Parathion Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255467
Pollutant:	Parathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 to 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	138479	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Pentachlorophenol (PCP)
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 138479, Pentachlorophenol (PCP) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85913
Pollutant:	Pentachlorophenol (PCP)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	The reporting limits for all 23 of the non-detect samples were greater than the criteria, therefore were not used in this assessment.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The California Toxic Rule, 4-day avg. at pH 6.5 is 4 ug/L.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138479, Pentachlorophenol (PCP) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255623
Pollutant:	Pentachlorophenol (PCP)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	6
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the water quality threshold for Pentachlorophenol. Although a total of 9 samples were collected, 3 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 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:	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 (770470).
Temporal Representation:	Data for this waterbody was collected over the date range 2012-02-07 to 2016-11-15
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	138509	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Permethrin
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 138509, Permethrin Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	265002
Pollutant:	Permethrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Permethrin. Although a total of 1 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 Environmental Data Exchange Network 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 chronic criterion for permethrin is 1 ng/L (expressed as a 4-day average).  If the freely dissolved concentrations of permethrin were reported or could be calculated then these values were used for this assessment.  In the absence of freely dissolved concentrations, total concentrations were used.
Guideline Reference:	Water Quality Criteria Report for Permethrin
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	Data for this waterbody were collected over the date range 2015-06-03 to 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138491	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Pyrethroids
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 138491, Pyrethroids Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	265418
Pollutant:	Pyrethroids
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 1 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 Environmental Data Exchange Network 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 summed ratios of the pyrethroid pesticides bifenthrin, cyfluthrin, cypermethrin, esfenvalerate, lambda-cyhalothrin, permethrin and their respective chronic concentration goals are not to exceed 1. If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment.  In the absence of freely dissolved concentrations, total concentrations were used.
Guideline Reference:	Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the Control of Pyrethroid Pesticide Discharges
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	Data for this waterbody were collected over the date range 2015-06-03 to 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138482	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Selenium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. 2 lines of evidence are available in the administrative record to assess this pollutant. 0 of 31 samples exceeded the CRITERIA. 0 of 66 samples exceeded 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 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 66 and 0 of 31 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 138482, Selenium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255846
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138482, Selenium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255411
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138482, Selenium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255873
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138482, Selenium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85915
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	31
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the 31 samples exceeded the criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The CTR for selenium is 5.0 ug/L.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138482, Selenium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255384
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138482, Selenium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255803
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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	138483	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Silver
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 66 and 0 of 31 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 138483, Silver Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256001
Pollutant:	Silver
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138483, Silver Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255812
Pollutant:	Silver
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138483, Silver Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255829
Pollutant:	Silver
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138483, Silver Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255982
Pollutant:	Silver
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138483, Silver Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85932
Pollutant:	Silver
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	31
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the 31 samples exceeded the hardness adjusted criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion maximum concentrations for silver to protect aquatic life in freshwater (1-hour average). The silver criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a value of 100 mg/L was used.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138483, Silver Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255983
Pollutant:	Silver
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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	138484	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Sulfates
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 65 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 138484, Sulfates Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243881
Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	18
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 18 samples exceed the criterion for 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 list a site specific objective for Sulfate in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 300 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-650 (34.134833, -118.274533), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 5/1/2012 - 2/16/2017, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138484, Sulfates Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243907
Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 14 samples exceed the criterion for 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 list a site specific objective for Sulfate in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 300 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-LAGT654(a) (34.13, -118.27314), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 5/2/2017 - 8/11/2020, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138484, Sulfates Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243903
Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 14 samples exceed the criterion for 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 list a site specific objective for Sulfate in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 300 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-LAGT650 (34.1377, -118.27532), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 5/2/2017 - 8/11/2020, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138484, Sulfates Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243885
Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 17 samples exceed the criterion for 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 list a site specific objective for Sulfate in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 300 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-654 (34.122833, -118.27045), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 2/7/2012 - 11/15/2016, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138484, Sulfates Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243894
Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 2 samples exceed the criterion for 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 list a site specific objective for Sulfate in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 300 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-654(a) (34.13, -118.27314), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 12/6/2016 - 2/16/2017, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program

DECISION ID	138485	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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. 2 lines of evidence are available in the administrative record to assess this pollutant. 0 of 235 samples exceeded the objective. 0 of 766 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. 0 of 235 and 0 of 766 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 138485, Temperature, water Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255941
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-04-25
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 138485, Temperature, water Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255966
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	169
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 169 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138485, Temperature, water Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255858
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	197
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 197 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-30
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 138485, Temperature, water Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255989
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	169
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 169 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138485, Temperature, water Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255922
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	214
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 214 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-04-25
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 138485, Temperature, water Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85933
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	235
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	0 of the 235 samples exceeded the evaluation guideline for water temperature.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	For waters designated as WARM, water temperature shall not be altered more than 5 degrees F above the natural temperature. At no time shall these WARM designated waters be raised above 80 degrees F as a result of waste discharges.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	At no time shall these WARM designated waters be raised above 80 degrees F
Guideline Reference:	Fish introductions in CA: History and impact on native fishes. Davis, CA: University of CA, Davis
Spatial Representation:	Samples were collected at three locations in Reach 3 of the Los Angeles River: Site 1: Lat. 34.1377167 Lon. -118.2753667, Site 2: Lat. 34.1348333 Lon. -118.2745333, Site 3: Lat. 34.1228333 Lon. -118.2704500
Temporal Representation:	Samples collected between July 2005 and June 2010.
Environmental Conditions:
QAPP Information:	QUALITY ASSURANCE MANUAL Prepared for The Analysts, Supervisors, and Managers of the Environmental Monitoring Division ENVIRONMENTAL MONITORING DIVISION BUREAU OF SANITATION DEPARTMENT OF PUBLIC WORKS CITY OF LOS ANGELES, December 2009
QAPP Information Reference(s):

DECISION ID	138486	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 66 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 138486, Thallium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256036
Pollutant:	Thallium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA Quality Criteria for Water (Gold Book) states that 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138486, Thallium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255757
Pollutant:	Thallium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA Quality Criteria for Water (Gold Book) states that 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138486, Thallium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255770
Pollutant:	Thallium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA Quality Criteria for Water (Gold Book) states that 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138486, Thallium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255773
Pollutant:	Thallium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA Quality Criteria for Water (Gold Book) states that 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138486, Thallium Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255906
Pollutant:	Thallium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	The USEPA Quality Criteria for Water (Gold Book) states that 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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	138487	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Total Dissolved Solids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	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 66 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 138487, Total Dissolved Solids Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243914
Pollutant:	Total Dissolved Solids
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 14 samples exceed the criterion for Total Dissolved Solids.
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 list a site specific objective for Total Dissolved Solids in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 950 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-LAGT654(a) (34.13, -118.27314), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 5/2/2017 - 8/11/2020, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138487, Total Dissolved Solids Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243882
Pollutant:	Total Dissolved Solids
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 19 samples exceed the criterion for Total Dissolved Solids.
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 list a site specific objective for Total Dissolved Solids in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 950 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-650 (34.134833, -118.274533), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 2/7/2012 - 2/16/2017, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138487, Total Dissolved Solids Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243891
Pollutant:	Total Dissolved Solids
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 17 samples exceed the criterion for Total Dissolved Solids.
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 list a site specific objective for Total Dissolved Solids in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 950 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-654 (34.122833, -118.27045), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 2/7/2012 - 11/15/2016, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138487, Total Dissolved Solids Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243895
Pollutant:	Total Dissolved Solids
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 2 samples exceed the criterion for Total Dissolved Solids.
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 list a site specific objective for Total Dissolved Solids in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 950 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-654(a) (34.13, -118.27314), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 12/6/2016 - 2/16/2017, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program
Line of Evidence (LOE) for Decision ID 138487, Total Dissolved Solids Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	243904
Pollutant:	Total Dissolved Solids
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from the Los Angeles-Glendale Wastewater Reclamation Plant to determine beneficial use support. The results are as follows: 0 out of 14 samples exceed the criterion for Total Dissolved Solids.
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 list a site specific objective for Total Dissolved Solids in the Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) of 950 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Station RSW-LAGT650 (34.1377, -118.27532), located in Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.).
Temporal Representation:	The water samples were taken between 5/2/2017 - 8/11/2020, per the monitoring requirements listed in the Los Angeles-Glendale Wastewater Reclamation Plant NPDES Permit monitoring and reporting program.
Environmental Conditions:
QAPP Information:	The work was performed in accordance with the Los Angeles-Glendale Wastewater Reclamation Plant NDPES Permit quality assurance provisions for water quality monitoring.
QAPP Information Reference(s):	Los Angeles River Watershed-Wide Monitoring Program

DECISION ID	138488	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Toxaphene
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 138488, Toxaphene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256246
Pollutant:	Toxaphene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 10 samples were collected, 10 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:	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: 770468 (RSW-650).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2017-02-16
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 138488, Toxaphene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256213
Pollutant:	Toxaphene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 2 samples were collected, 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2016-12-06 to 2017-02-16
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 138488, Toxaphene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256110
Pollutant:	Toxaphene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 8 samples were collected, 8 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:	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: 770470 (RSW-654).
Temporal Representation:	Data for this waterbody were collected over the date range 2012-02-07 to 2015-08-04
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 138488, Toxaphene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256178
Pollutant:	Toxaphene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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 138488, Toxaphene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85935
Pollutant:	Toxaphene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Since the criteria is smaller than the reporting limit and method detection limit, none of samples can be counted.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Los Angeles Region Basin Plan objective is "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:	Criteria Continuous Concentration (4-day Average) is 0.0002 ug/L
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	A total of 23 samples were collected at sampling locations, LA RIVER R-4 (9 samples), LA River R-5 (5 samples) and LA River R-7 (9 samples).
Temporal Representation:	23 samples from 2006 - 2010 were collected. At LA RIVER R-4, two samples in 2006, two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected. At LA River R-5, two samples in 2006, two samples in 2007, and one sample in 2008 were collected. LA River R-7 two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected.
Environmental Conditions:	There was no special environmental conditions reported.
QAPP Information:	ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF SANITATION DEPARTMENT OF PUBLIC WORKS CITY OF LOS ANGELES submitted QUALITY ASSURANCE MANUAL (QA) dated December 2009. The Quality Assurance Manual documents the QA Program
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138488, Toxaphene Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256261
Pollutant:	Toxaphene
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) 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 7 samples were collected, 7 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	Data for this waterbody were collected over the date range 2017-08-01 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	138498	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Triclopyr
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 138498, Triclopyr Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	267774
Pollutant:	Triclopyr
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Triclopyr.
Data Reference:	WQ data from the California Environmental Data Exchange Network 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 triclopyr is the USEPA Aquatic Life Benchmark of 26 ug/L for a fish (chronic) for Triclopyr Butoxyethyl Ester (BEE).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site: Los Angeles 247 (Los Angeles River upper watershed).
Temporal Representation:	The samples were collected between the dates of 2015-06-03 and 2015-06-03
Environmental Conditions:
QAPP Information:	Department of Pesticide Regulation Environmental Monitoring Branch Surface Water Protection Program. 2018. STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern.
QAPP Information Reference(s):	STUDY 270: Ambient Surface Water and Mitigation Monitoring in Urban Areas in Southern

DECISION ID	138489	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 66 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 138489, Turbidity Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256285
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138489, Turbidity Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256295
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138489, Turbidity Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256217
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138489, Turbidity Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256186
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Turbidity.
Data Reference:	WQ data from the 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138489, Turbidity Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256216
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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	138490	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 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 18, 4 of 75 and 0 of 93 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 138490, Zinc Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256107
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138490, Zinc Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256221
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	19
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 19 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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 138490, Zinc Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256223
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	14
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 14 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-02 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 138490, Zinc Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256104
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138490, Zinc Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	253039
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	4
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed LA County MS4 data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 4 of 7 samples exceeded the water quality threshold for Zinc.
Data Reference:	WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 120 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: LAR_03_FIG (Los Angeles River (Figueroa St)).
Temporal Representation:	The samples were collected between the dates of 2016-08-20 and 2019-11-27
Environmental Conditions:
QAPP Information:	Municipal Separate Storm Sewer System (MS4)
QAPP Information Reference(s):	Municipal Separate Storm Sewer System (MS4)
Line of Evidence (LOE) for Decision ID 138490, Zinc Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	252899
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed LA County MS4 data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Zinc.
Data Reference:	WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 120 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: LAR_03_ZOO (Los Angeles River (Zoo Dr)).
Temporal Representation:	The samples were collected between the dates of 2016-08-20 and 2018-05-15
Environmental Conditions:
QAPP Information:	Municipal Separate Storm Sewer System (MS4)
QAPP Information Reference(s):	Municipal Separate Storm Sewer System (MS4)
Line of Evidence (LOE) for Decision ID 138490, Zinc Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	252896
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed LA County MS4 data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Zinc.
Data Reference:	WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 120 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: LAR_03_ZOO (Los Angeles River (Zoo Dr)).
Temporal Representation:	The samples were collected between the dates of 2016-01-20 and 2019-08-13
Environmental Conditions:
QAPP Information:	Municipal Separate Storm Sewer System (MS4)
QAPP Information Reference(s):	Municipal Separate Storm Sewer System (MS4)
Line of Evidence (LOE) for Decision ID 138490, Zinc Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	256158
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	17
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 17 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-15
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 138490, Zinc Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85953
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	93
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the 93 samples exceeded the hardness adjusted criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a value of 100 mg/L was used.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 138490, Zinc Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	252991
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed LA County MS4 data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Zinc.
Data Reference:	WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 120 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: LAR_03_FIG (Los Angeles River (Figueroa St)).
Temporal Representation:	The samples were collected between the dates of 2016-01-20 and 2019-08-13
Environmental Conditions:
QAPP Information:	Municipal Separate Storm Sewer System (MS4)
QAPP Information Reference(s):	Municipal Separate Storm Sewer System (MS4)

DECISION ID	138460	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 34 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 138460, alpha-Endosulfan (Endosulfan 1) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254652
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138460, alpha-Endosulfan (Endosulfan 1) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254623
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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 138460, alpha-Endosulfan (Endosulfan 1) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254555
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138460, alpha-Endosulfan (Endosulfan 1) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254671
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138460, alpha-Endosulfan (Endosulfan 1) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254603
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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	138477	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 of 34 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 138477, beta-Endosulfan (Endosulfan 2) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254380
Pollutant:	beta-Endosulfan (Endosulfan 2)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 2 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:	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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-06 and 2017-02-16
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 138477, beta-Endosulfan (Endosulfan 2) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254345
Pollutant:	beta-Endosulfan (Endosulfan 2)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 8 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:	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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2015-08-04
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 138477, beta-Endosulfan (Endosulfan 2) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254354
Pollutant:	beta-Endosulfan (Endosulfan 2)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138477, beta-Endosulfan (Endosulfan 2) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254373
Pollutant:	beta-Endosulfan (Endosulfan 2)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 7 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:	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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 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 138477, beta-Endosulfan (Endosulfan 2) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	254355
Pollutant:	beta-Endosulfan (Endosulfan 2)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 10 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:	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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-02-16
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	138480	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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. 23 of 967 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. 23 of 967 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 138480, pH Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85914
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	542
Number of Exceedances:	7
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Seven of the 542 samples exceeded the objective.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 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 the R-4, R-5, and R-7 monitoring locations.
Temporal Representation:	Samples were collected approximately once a week from July 2005 to June 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 138480, pH Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255504
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	91
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 91 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: 833670 (RSW-LAGT654(a)).
Temporal Representation:	The samples were collected between the dates of 2017-05-09 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 138480, pH Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255689
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	111
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 111 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: 770470 (RSW-654).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2016-11-30
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 138480, pH Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255404
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 0 of 11 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: 829991 (RSW-654(a)).
Temporal Representation:	The samples were collected between the dates of 2016-12-13 and 2017-04-25
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 138480, pH Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255479
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	91
Number of Exceedances:	6
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 6 of 91 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: 833667 (RSW-LAGT650).
Temporal Representation:	The samples were collected between the dates of 2017-05-09 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 138480, pH Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	255403
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	121
Number of Exceedances:	10
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed eSMR_Los Angeles-Glendale WWRP data for Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) to determine beneficial use support and results are as follows: 10 of 121 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: 770468 (RSW-650).
Temporal Representation:	The samples were collected between the dates of 2012-02-07 and 2017-04-25
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	72373	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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:	Other
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 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. 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 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 72373, Scum/Foam-unnatural Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2506
Pollutant:	Scum/Foam-unnatural
LOE Subgroup:	Narrative Description Data
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	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	69968	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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. The Los Angeles River Nitrogen TMDL was approved by RWQCB on August 19, 2003 and subsequently approved by USEPA on March 18, 2004.
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 69968, Taste and odor Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2505
Pollutant:	Taste and odor
LOE Subgroup:	Pollutant-Water
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference:	Placeholder reference 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	70709	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Lead
Final Listing Decision:	Delist from 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Delist from 303(d) list (being addressed by USEPA approved TMDL)(2016)
Revision Status	Original
Reason for Delisting:	Applicable WQS attained; due to restoration activities
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 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. 2 lines of evidence are available in the administrative record to assess this pollutant. 1 of the 93 samples exceeded the CRITERIA. 0 of the 0 samples exceeded the CRITERIA. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 1 of 93 and 0 of 0 samples exceeded the CRITERIA and this does not exceed the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 70709, Lead Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2511
Pollutant:	Lead
LOE Subgroup:	Pollutant-Water
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	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 70709, Lead Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86010
Pollutant:	Lead
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	93
Number of Exceedances:	1
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	One of the 93 samples exceeded the hardness adjusted criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a value of 100 mg/L was used.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):

DECISION ID	69733	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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)(2016)
Revision Status	Original
Sources:	A Source Unknown
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 removal on the CWA section 303(d) List under sections 2.2 and 3.1 of the Listing Policy. Under SECTION 3.1 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. 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. 8 of 93 samples exceeded the CRITERIA and these exceed the allowable frequency listed in Table 3.1of the Listing Policy. 4. The Los Angeles Metals TMDL was approved by USEPA on 12/22/2005 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. There is sufficient justification to place this waterbody/pollutant in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: 1. The Los Angeles River Metals TMDL was approved by USEPA on 10/29/2008.
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 69733, Copper Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85997
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	93
Number of Exceedances:	8
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	Eight of the 93 samples exceeded the hardness adjusted criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a value of 100 mg/L was used.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 69733, Copper Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2510
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	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):

DECISION ID	99749	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Benthic Community Effects
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:	Benthic Community Effects is being considered for placement on the CWA section 303(d) List under sections 3.9 of the Listing Policy. Under section 3.9, additional lines of evidence associating the Benthic Community Effects with a water or sediment concentration of pollutants and there are multiple lines of evidence for other impairments. Three samples were collected from the Los Angeles River Reach 3 over three years. Four of the four samples collected had an IBI score below 40. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing Benthic Community Effects in this water segment 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. Three samples were collected from Los Angeles River Reach 3over two years. Four of the four samples collected had an IBI score below 40. However, the Los Angeles Water Board has identified this waterbody as needing further monitoring and data collection. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. The CSCI is applicable statewide, accounts for a much wider range of natural variability, and provides equivalent scoring thresholds in all regions of the state. The CSCI will be used in the future for water quality assessment purposes statewide over the regional indices of biologic integrity (IBIs).
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:	The CSCI is applicable statewide, accounts for a much wider range of natural variability, and provides equivalent scoring thresholds in all regions of the state. The CSCI will be used in the future for water quality assessment purposes statewide over the regional indices of biologic integrity (IBIs).
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 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2510
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	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 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85997
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	93
Number of Exceedances:	8
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	Eight of the 93 samples exceeded the hardness adjusted criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a value of 100 mg/L was used.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2507
Pollutant:	Ammonia
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference:	Placeholder reference 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 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	28079
Pollutant:	Trash
LOE Subgroup:	Narrative Description Data
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	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 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2508
Pollutant:	Trash
LOE Subgroup:	Narrative Description Data
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	The Los Angeles River Trash TMDL was completed by the Regional Board on September 19, 2001 (USEPA, 2002) to address impairments caused by trash. However, on July 19, 2006 the State Board rescinded approval of this TMDL and remanded it back to the Regional Board based on court ruling City of Arcadia v. State Water Resources Control Board (D043877).
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 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85994
Pollutant:	Benthic-Macroinvertebrate Bioassessments
LOE Subgroup:	Population/Community Degradation
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	4
Data and Information Type:	Benthic macroinvertebrate surveys
Data Used to Assess Water Quality:	Four samples were collected from two sites on the Los Angeles River over two years. Four of the four samples collected had IBI scores below 40. The scores were 7 and 0 (2006) and 17 and 0 (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 near confluence with Arroyo Seco Channel, station 12 and Los Angeles River at Victory Blvd, station 11.
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 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85936
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	75
Number of Exceedances:	29
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Seventy-five samples were collected to evaluate water toxicity. Twenty-nine of the 75 samples exhibited significant toxicity. The toxicity tests included acute toxicity using Atherinops affinis and chronic toxicity using Ceriodaphnia dubia, Selenastrum capricornutum and Pimephales promelas.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 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 R4, R5 and R7.
Temporal Representation:	The samples were collected every three months from November 2005 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 CA0053953.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2511
Pollutant:	Lead
LOE Subgroup:	Pollutant-Water
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	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 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86010
Pollutant:	Lead
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	93
Number of Exceedances:	1
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	One of the 93 samples exceeded the hardness adjusted criteria.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a value of 100 mg/L was used.
Objective/Criterion Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The River was sampled between Figueroa St. and Riverside Dr.
Temporal Representation:	One sample was collected in 2007, two samples was collected in 2008, three samples were collected in 2009, and one sample was collected in 2010.
Environmental Conditions:	There was no special environmental condition reported.
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.los angeles river
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86019
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	51
Number of Exceedances:	13
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	13 out of 51 monthly averages exceeded the site specific basin plan objective for total ammonia as nitrogen. All exceedences occurred 2007 and prior.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	he 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 waterbody are based upon the presence of early life stages and found in Table 3-4. "Site-Specific 30-day Average Objectives for Ammonia by Waterbody Reach." Site specific objectives are applied as if early life stages are absent (dates ranging October 1 to March 31).
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected in three locations: LAG R4, LAG R5, and LAG R7.
Temporal Representation:	Samples were collected weekly from 07/2005 through 06/2010. Only samples collected from the months of October 1 to March 31 have been included.
Environmental Conditions:
QAPP Information:	All 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 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85894
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	60
Number of Exceedances:	20
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	20 out of 60 monthly averages exceeded the site specific basin plan objective for total ammonia as nitrogen. All the exceedences were 2007 and prior.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 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 waterbody are based upon the presence of early life stages and found in Table 3-4. "Site-Specific 30-day Average Objectives for Ammonia by Waterbody Reach." Site specific objectives are applied as if early life stages are present (dates ranging April 1 to September 30).
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Samples were collected in three locations: LAG R4, LAG R5, and LAG R7.
Temporal Representation:	Samples were collected weekly from 07/2005 through 06/2010. Only samples collected from the months of April 1 to September 30 have been included.
Environmental Conditions:
QAPP Information:	All 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 99749, Benthic Community Effects Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2504
Pollutant:	Nutrients (Algae)
LOE Subgroup:	Pollutant-Water
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	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	100591	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 23 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 23 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 100591, DDD (Dichlorodiphenyldichloroethane) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85999
Pollutant:	DDD (Dichlorodiphenyldichloroethane)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	23
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the twenty three samples exceeded the evaluation guideline.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 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 LA River R4, LA River R5 and LA River R7.
Temporal Representation:	Samples were collected in 2006 on February 7 and August 2, and in 2007 on February 7.
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):

DECISION ID	96144	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 23 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 23 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 96144, DDE (Dichlorodiphenyldichloroethylene) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86000
Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	23
Number of Exceedances:	0
Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	None of the twenty three samples exceeded the evaluation guideline.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 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.
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 LA River R4, LA River R5 and LA River R7.
Temporal Representation:	Samples were collected in 2006 on February 7 and August 2, and in 2007 on February 7.
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):

DECISION ID	96145	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

Pollutant:	Endosulfan
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 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. 1 line of evidence is available in the administrative record to assess this pollutant. 0 of 23 samples exceeded 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 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 23 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:	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 96145, Endosulfan Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	86003
Pollutant:	Endosulfan
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	23
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 23 samples exceeded the water quality criteria/objective.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use.
Objective/Criterion Reference:	Water Quality Control Plan Los Angeles Region R4 Basin Plan
Evaluation Guideline:	Toxic Rule criteria fresh aquatic life protection continuous concentration (4-day average)is 0.056 ug/L.
Guideline Reference:	Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
Spatial Representation:	A total of 23 samples were collected at sampling locations, LA RIVER R-4 (9 samples), LA River R-5 (5 samples) and LA River R-7 (9 samples).
Temporal Representation:	23 samples from 2006 - 2010 were collected. At LA RIVER R-4, two samples in 2006, two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected. At LA River R-5, two samples in 2006, two samples in 2007, and one sample in 2008 were collected. LA River R-7 two samples in 2007, two samples in 2008, two samples in 2009, and one sample in 2010 were collected.
Environmental Conditions:	There was no special environmental conditions reported.
QAPP Information:	ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF ENVIRONMENTAL MONITORING DIVISION (EMD) BUREAU OF SANITATION DEPARTMENT OF PUBLIC WORKS CITY OF LOS ANGELES submitted QUALITY ASSURANCE MANUAL (QA) dated December 2009. The Quality Assurance Manual documents the QA Program
QAPP Information Reference(s):

DECISION ID	100454	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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. 29 of 75 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. 29 of 75 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 100454, Toxicity Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	85936
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	75
Number of Exceedances:	29
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Seventy-five samples were collected to evaluate water toxicity. Twenty-nine of the 75 samples exhibited significant toxicity. The toxicity tests included acute toxicity using Atherinops affinis and chronic toxicity using Ceriodaphnia dubia, Selenastrum capricornutum and Pimephales promelas.
Data Reference:	Data from Los Angeles-Glendale Water Reclamation Plant NPDES Permit no. CA0053953, Jul. 2005-Jun. 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 R4, R5 and R7.
Temporal Representation:	The samples were collected every three months from November 2005 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 CA0053953.
QAPP Information Reference(s):

DECISION ID	68871	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 68871, Nutrients (Algae) Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2504
Pollutant:	Nutrients (Algae)
LOE Subgroup:	Pollutant-Water
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	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	68157	Region 4
Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)

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 68157, Trash Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	2508
Pollutant:	Trash
LOE Subgroup:	Narrative Description Data
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	The Los Angeles River Trash TMDL was completed by the Regional Board on September 19, 2001 (USEPA, 2002) to address impairments caused by trash. However, on July 19, 2006 the State Board rescinded approval of this TMDL and remanded it back to the Regional Board based on court ruling City of Arcadia v. State Water Resources Control Board (D043877).
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 68157, Trash Region 4      Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.)
LOE ID:	28079
Pollutant:	Trash
LOE Subgroup:	Narrative Description Data
Matrix:	Not Specified
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	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):