Draft California 2020 Integrated Report (303(d) List/305(b) Report)

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).

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.015 ug/L (4 day average)(Siepmann and Finlayson 2000).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111413, Chlorpyrifos	Region 9
Temecula Creek

LOE ID:

219706

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.015 ug/L (4 day average)(Siepmann and Finlayson 2000).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Watershed Annual Progress Report 2004 to 2005 and 2005 to 2006

Line of Evidence (LOE) for Decision ID 111413, Chlorpyrifos	Region 9
Temecula Creek

LOE ID:

6462

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical monitoring (conventional pollutants only)

Data Used to Assess Water Quality:

Seven out of nine samples collected exceed the water quality objective according to results in the Riverside County Flood Control and Water Conservation District annual progress report from 2005 and 2006. Samples were collected from October 2004 through May 2006.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in the water column, sediments or biota at concentration(s) that adversely affect beneficial uses. Pesticides shall not be present at levels which will bioaccumulate in aquatic organisms to levels which are harmful to human health, wildlife or aquatic organisms (RWQCB, 2007).

Objective/Criterion 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

Evaluation Guideline:

The 4-day average concentration of chlorpyrifos in freshwater is 0.014 ug/L. The 1-hour average concentration of chlorpyrifos in freshwater is 0.025 ug/L according to Siepmann and Finlayson, 2000; Finlayson, 2004.

Guideline Reference:

Spatial Representation:

Samples were collected at Temecula Creek below Pala Road, lat/long: 33°28¿26.4¿ N/117°07¿46.1¿ W.

Temporal Representation:

Four to six samples are collected per monitoring year. Samples were collected from October 2004 through May 2006.

Environmental Conditions:

One sample represents the first storm event of each monitoring year that produces sufficient flow to collect a composite sample. In addition, three samples represent wet weather and two samples represent dry weather. However, one sampling event in the 2004-2005 monitoring year did not analyze for all constituents.

QAPP Information:

QA/QC conducted according to Federal Regulations under requirements of a NPDES permit.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111413, Chlorpyrifos	Region 9
Temecula Creek

LOE ID:

141160

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 0 of the 14 samples exceeded the water quality threshold for Chlorpyrifos. Although a total of 30 samples were collected, 16 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:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

The 2018 USEPA drinking water health advisory for chlorpyrifos is 2 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Watershed Annual Progress Report 2004 to 2005 and 2005 to 2006


DECISION ID	111414	Region 9
Temecula Creek

Pollutant:	Copper
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2021
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. Seven lines of evidence are available in the administrative record to assess pollutant. Four of the 38 samples exceed the water quality threshold for the WARM beneficial use. Zero of 29 samples exceed the water quality threshold for the MUN beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Four of the 38 samples exceed the water quality threshold, and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be 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 111414, Copper	Region 9
Temecula Creek

LOE ID:

6515

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical monitoring (conventional pollutants only)

Data Used to Assess Water Quality:

Four of eight samples exceeded the warm freshwater habitat water quality objective for Copper from results in the Riverside County Flood Control and Water Conservation annual progress reports from 2005 and 2006. The eight samples were collected between October 2004 and May 2006.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the CTR, the dissolved copper chronic criterion is 3.1 ppb and the acute criterion is 4.8 ppb, but these criteria may vary depending upon hardness of the sample (U.S. EPA, 2000).

Objective/Criterion Reference:

Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California; Rule. 40 CFR Part 131. U.S. Environmental Protection Agency, Region IX, Water Division, San Francisco, CA

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Temecula Creek below Pala Road, lat/long: 33°28¿26.4¿ N/117°07¿46.1¿ W.

Temporal Representation:

Four to six samples are collected per monitoring year. Samples were collected from October 2004 through May 2006.

Environmental Conditions:

One sample represents the first storm event of each monitoring year that produces sufficient flow to collect a composite sample. In addition, three samples represent wet weather and two samples represent dry weather. However, one sampling event in both the 2004-2005 and 2005-2006 monitoring years did not analyze for all constituents.

QAPP Information:

QA/QC conducted according to Federal Regulations under requirements of a NPDES permit.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111414, Copper	Region 9
Temecula Creek

LOE ID:

141619

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality threshold for Copper.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary MCL for copper is 1.0 mg/L (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111414, Copper	Region 9
Temecula Creek

LOE ID:

136448

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Copper .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper in 149 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111414, Copper	Region 9
Temecula Creek

LOE ID:

141618

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary MCL for copper is 1.0 mg/L (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111414, Copper	Region 9
Temecula Creek

LOE ID:

141620

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion continuous concentrations 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.

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111414, Copper	Region 9
Temecula Creek

LOE ID:

141576

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111414, Copper	Region 9
Temecula Creek

LOE ID:

136630

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper in 149 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Data for Various Pollutants in Riverside County, 2007-2009.


DECISION ID	128039	Region 9
Temecula Creek

Pollutant:	Indicator Bacteria
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2025
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.3 of the Listing Policy. Under section 4.3 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Thirteen of the 25 samples exceed the STV threshold for E. coli. 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 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. Thirteen of the 25 samples exceeded the E. coli water quality threshold for the protection of REC-1, and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. The State Water Board’s Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California (the “ISWEBE Plan”) contains two bacteria water quality objectives applicable to the REC-1 beneficial use, which were adopted on August 7, 2018. Because the salinity level of this waterbody is equal to or less than 1 part per thousand 95 percent or more of the time, the E. coli bacteria objective applies Therefore, this waterbody is being considered for placement on or removal from the CWA section 303(d) List under section 3.3 or 4.3 of the Listing Policy, as applicable, using the E. coli objective. In accordance with section 6.1.5.3 of the Listing Policy, data should be representative of the critical timing that the pollutant is expected to impact the waterbody. Indicator bacteria (total coliform, fecal coliform, E. coli, enterococci) populations may fluctuate substantially on a daily, seasonal, or yearly basis. Lacking constant inputs, they do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of indicator bacteria in the waterbody may be a poor indicator of current risks to human health, particularly when more recent data are available to sufficiently assess the water quality standard. Additionally, water quality conditions in waterbodies may change as a result of management actions that have been implemented to address bacteria. Unrepresentative data may result in incorrectly placing or not placing a water body segment on the list, which could result in the unnecessary expenditure of public resources or missing a human health problem. Historic lines of evidence for data collected prior to 2010 were evaluated pursuant to these considerations and were not used to assess water quality standards attainment because they do not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy. For E. coli data, Listing Policy sections 3.3 and 4.3 instructs to use the binomial distribution table in sections 3.2 and 4.2, as applicable. To use the binomial table that uses a four percent exceedance frequency, the data must be collected from coastal beaches or inland surface waters from April 1 through October 31 only, and where collected from inland waters from April 1 through October 31 only, bacterial measurements must be indicative of human fecal matter, and there is substantial human contact in the waterbody. No fecal coliform data are used in this assessment because the fecal coliform water quality objective was superseded and is no longer used as the basis of any 303(d) List decision for water contact recreation.

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:	The State Water Board’s Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California (the “ISWEBE Plan”) contains two bacteria water quality objectives applicable to the REC-1 beneficial use, which were adopted on August 7, 2018. Because the salinity level of this waterbody is equal to or less than 1 part per thousand 95 percent or more of the time, the E. coli bacteria objective applies Therefore, this waterbody is being considered for placement on or removal from the CWA section 303(d) List under section 3.3 or 4.3 of the Listing Policy, as applicable, using the E. coli objective. In accordance with section 6.1.5.3 of the Listing Policy, data should be representative of the critical timing that the pollutant is expected to impact the waterbody. Indicator bacteria (total coliform, fecal coliform, E. coli, enterococci) populations may fluctuate substantially on a daily, seasonal, or yearly basis. Lacking constant inputs, they do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of indicator bacteria in the waterbody may be a poor indicator of current risks to human health, particularly when more recent data are available to sufficiently assess the water quality standard. Additionally, water quality conditions in waterbodies may change as a result of management actions that have been implemented to address bacteria. Unrepresentative data may result in incorrectly placing or not placing a water body segment on the list, which could result in the unnecessary expenditure of public resources or missing a human health problem. Historic lines of evidence for data collected prior to 2010 were evaluated pursuant to these considerations and were not used to assess water quality standards attainment because they do not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy. For E. coli data, Listing Policy sections 3.3 and 4.3 instructs to use the binomial distribution table in sections 3.2 and 4.2, as applicable. To use the binomial table that uses a four percent exceedance frequency, the data must be collected from coastal beaches or inland surface waters from April 1 through October 31 only, and where collected from inland waters from April 1 through October 31 only, bacterial measurements must be indicative of human fecal matter, and there is substantial human contact in the waterbody. No fecal coliform data are used in this assessment because the fecal coliform water quality objective was superseded and is no longer used as the basis of any 303(d) List decision for water contact recreation.

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 128039, Indicator Bacteria	Region 9
Temecula Creek

LOE ID:

72784

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Four of the seven samples exceeded the total coliform objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Basin Plan for the San Diego Basin.

Objective/Criterion Reference:

Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.

Evaluation Guideline:

The total coliform concentration shall not exceed more than 10000/100 ml. Guidance For Fresh Water Beaches (CDPH).

Guideline Reference:

Spatial Representation:

The samples were collected at Temecula Creek.

Temporal Representation:

Samples were collected between October 2007 and May 2009.

Environmental Conditions:

QAPP Information:

No QAPP was submitted. Sampling was done by municipalities in Riverside County pursuant to the Riverside County Municipal Stormwater Permit.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 128039, Indicator Bacteria	Region 9
Temecula Creek

LOE ID:

7403

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical monitoring (conventional pollutants only)

Data Used to Assess Water Quality:

Four out of seven samples collected exceed the water quality objective according to results in the Riverside County Flood Control and Water Conservation District annual progress report from 2005 and 2006. Samples were collected from October 2004 through May 2006.

Data Reference:

Watershed Annual Progress Report 2004 to 2005 and 2005 to 2006

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan, no more than 10% of the samples during any 30-day period for waters designated for contact recreation shall exceed 400 per 100 ml (RWQCB, 2007).

Objective/Criterion Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Temecula Creek below Pala Road, lat/long: 33°28¿26.4¿ N/117°07¿46.1¿ W.

Temporal Representation:

Four samples are collected per monitoring year. Samples were collected from October 2004 through May 2006.

Environmental Conditions:

One sample represents the first storm event of each monitoring year that produces sufficient flow to collect a composite sample. In addition, three samples represent wet weather and two samples represent dry weather. However, one sampling event in both the 2004-2005 and 2005-2006 monitoring year did not analyze for all constituents.

QAPP Information:

QA/QC conducted according to Federal Regulations under requirements of a NPDES permit.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 128039, Indicator Bacteria	Region 9
Temecula Creek

LOE ID:

220628

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Temecula Creek to determine beneficial use support and the results are as follows: 13 of the 25 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective applicable to all non-saline waters, is a Statistical Threshold Value (STV) of 320 cfu/100 mL. The applicable STV shall not be exceeded by more than 10 percent of the samples collected in a calendar month, calculated in a static manner (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): 902LTC777

Temporal Representation:

The samples were collected between the days of 2012-10-04 and 2018-03-22 .

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Data for Various Pollutants in Riverside County, 2007-2009.

Line of Evidence (LOE) for Decision ID 128039, Indicator Bacteria	Region 9
Temecula Creek

LOE ID:

72782

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Seven of the seven samples exceeded the E. coli objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The E.Coli concentration shall not exceed more than 235/100 ml. Water Quality Control Plan for the San Diego Basin.

Objective/Criterion Reference:

Data for Various Pollutants in Riverside County, 2007-2009.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at Temecula Creek.

Temporal Representation:

Samples were collected between October 2007 and May 2009.

Environmental Conditions:

QAPP Information:

No QAPP was submitted. Sampling was done by municipalities in Riverside County pursuant to the Riverside County Municipal Stormwater Permit.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 128039, Indicator Bacteria	Region 9
Temecula Creek

LOE ID:

72783

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Five of the seven samples exceeded the fecal Coliform objectivec

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Fecal Coliform concentration shall not exceed more than 400/100 ml. Water Quality Control Plan for the San Diego Basin.

Objective/Criterion Reference:

Watershed Annual Progress Report 2004 to 2005 and 2005 to 2006

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at Temecula Creek.

Temporal Representation:

Samples were collected between October 2007 and May 2009.

Environmental Conditions:

QAPP Information:

No QAPP was submitted. Sampling was done by municipalities in Riverside County pursuant to the Riverside County Municipal Stormwater Permit.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 128039, Indicator Bacteria	Region 9
Temecula Creek

LOE ID:

7152

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical monitoring (conventional pollutants only)

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The maximum E. coli level for moderately or lightly used areas is 406 colonies per 100 ml ( RWQCB, 2007).

Objective/Criterion Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Temecula Creek below Pala Road, lat/long: 33°28¿26.4¿ N/117°07¿46.1¿ W.

Temporal Representation:

Four samples are collected per monitoring year. Samples were collected from October 2004 through May 2006.

Environmental Conditions:

One sample represents the first storm event of each monitoring year that produces sufficient flow to collect a composite sample. In addition, three samples represent wet weather and two samples represent dry weather. However, one sampling event in both the 2004-2005 and 2005-2006 monitoring year did not analyze for all constituents.

QAPP Information:

QA/QC conducted according to Federal Regulations under requirements of a NPDES permit.

QAPP Information Reference(s):


DECISION ID	111431	Region 9
Temecula Creek

Pollutant:	Phosphorus
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2019
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. Six lines of evidence are available in the administrative record to assess pollutant. One hundred and seventy-seven of the 199 samples exceed the threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One hundred and seventy-eight of the 199 samples exceed the threshold, and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be 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 111431, Phosphorus	Region 9
Temecula Creek

LOE ID:

145865

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 28 of 29 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Concentrations of nitrogen and phosphorus, by themselves or in combination with other nutrients, shall be maintained at levels below those which stimulate algae and emergent plant growth. A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total P. Analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111431, Phosphorus	Region 9
Temecula Creek

LOE ID:

145846

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB9 Monitoring data for Temecula Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Phosphorus as P.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111431, Phosphorus	Region 9
Temecula Creek

LOE ID:

145832

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111431, Phosphorus	Region 9
Temecula Creek

LOE ID:

77113

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

9 of 9 samples exceed the water quality objective for Total Phosphorus for Temecula Creek.

Data Reference:

Data for Various Pollutants in Riverside County, 2007-2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Table 3-2 of the San Diego Basin Plan states that the water quality objective for Total Phosphorus for Temecula Creek is 0.1 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at 777 (Temecula Creek).

Temporal Representation:

Samples were collected from 10/16/2007 to 5/21/2009.

Environmental Conditions:

QAPP Information:

No quality assurance information was provided.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111431, Phosphorus	Region 9
Temecula Creek

LOE ID:

3158

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

160

Number of Exceedances:

139

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by the Rancho California Water District in 1999-2002. There were 139 of 160 samples that were in exceedance (RCWD, 2002).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters - streams and other flowing waters
and all beneficial uses, the WQO for total phosphorus is 0.1 mg/L. This appears to be desired goal in order to prevent plant nuisance in streams and other flowing waters; not to be exceeded more than 10% of the time.

Objective/Criterion Reference:

Evaluation Guideline:

Use unless studies of the specific water body in question clearly show that water quality objective changes are permissible and changes are approved by the Regional Board.

Guideline Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Spatial Representation:

Samples were collected at Temecula Creek.

Temporal Representation:

Samples were collected 4-5 times per month from 03/31/1999 to 04/17/2002.

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111431, Phosphorus	Region 9
Temecula Creek

LOE ID:

145721

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):


DECISION ID	111438	Region 9
Temecula Creek

Pollutant:	Total Dissolved Solids
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Five lines of evidence are available in the administrative record to assess this pollutant. One hundred eighty three of the 196 samples exceed the Basin Plan water quality objective for total dissolved solids. 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. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One hundred eighty three of 196 samples exceed the Basin Plan water quality objective for total dissolved solids, and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	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 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

3154

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB9 in 1998. One sample was collected and was in exceedance.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for TDS is 500 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.

Objective/Criterion Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Temecula Creek east of the confluence, west of I-15.

Temporal Representation:

Samples were collected on 06/09/1998.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment. QA=?

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147117

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147209

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 7 of 9 samples exceeded the water quality threshold for Total Dissolved Solids.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2014-05-07

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147348

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2014-05-07

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147261

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147143

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2014-05-07

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147011

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 18 of 25 samples exceeded the water quality threshold for Total Dissolved Solids.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2013-09-18 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147258

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2013-09-18 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147230

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147325

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2014-05-07

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

3155

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

160

Number of Exceedances:

156

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by Rancho California Water District from 1999 to 2002. There were 156 of 160 samples that were in exceedance (RCWD, 2002).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for TDS is 500 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.

Objective/Criterion Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Temecula Creek.

Temporal Representation:

Samples were collected 4-5 times per month from 03/31/1999 to 04/17/2002.

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147141

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2013-09-18 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147008

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2013-09-18 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111438, Total Dissolved Solids	Region 9
Temecula Creek

LOE ID:

147374

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):


DECISION ID	111439	Region 9
Temecula Creek

Pollutant:	Toxicity
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2021
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 4.6 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess pollutant. Twelve of the 27 samples exceed the water quality threshold. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Twelve of the 27 samples exceed the water quality threshold, and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be 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 111439, Toxicity	Region 9
Temecula Creek

LOE ID:

134678

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

9 of the 20 samples collected by San Diego Region for Temecula Creek exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca, for Growth (wt/surv indiv), Ceriodaphnia dubia, for Survival, Pimephales promelas, for Survival, Selenastrum capricornutum, for Total Cell Count, Hyalella azteca, for Survival, Ceriodaphnia dubia, for Reproduction, Pimephales promelas, for Growth (wt/surv indiv), Pimephales promelas, for Biomass (wt/orig indiv), Strongylocentrotus purpuratus, for Normal Development

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

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. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 station. Monitoring site: ( 902LTC777 )

Temporal Representation:

The samples were collected between the dates of 2014-09-10 and 2018-08-29.

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Watershed Annual Progress Report 2004 to 2005 and 2005 to 2006

Line of Evidence (LOE) for Decision ID 111439, Toxicity	Region 9
Temecula Creek

LOE ID:

7511

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Ambient toxicity testing (chronic)

Data Used to Assess Water Quality:

Hyalella Azteca-
Three out of seven samples were found to have acute toxicity by the Hyalella Azteca growth/survival test.
Selenastrum capricornutum-
None of seven samples were found to have toxicity by the green alage, Selenastrum capricornutum, growth test. Toxicity results were in the Riverside County Flood Control and Water Conservation District annual progress report from 2005 and 2006. Samples were collected from October 2004 through March 2006.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan, all waters shall be free of toxic substances that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (RWQCB, 2007).

Objective/Criterion Reference:

Waste Discharge Requirements for Discharges of Urban Runoff From the Municipal Separate Storm Sewer Systems Draining the Watersheds of the County of San Diego, the Incorporated Cities of San Diego, the San Diego Unified Port District, and the San Diego County Regional Airport. Order No. R9-2007-0001

Evaluation Guideline:

Samples were found to exhibit toxicity when the No Observed Effect Concentration (NOEC) or median lethal concentration (LC50) for any given species was estimated to be less than 100% of the test sample concentration.

Guideline Reference:

Spatial Representation:

Samples were collected at Temecula Creek below Pala Road, lat/long: 33°28¿26.4¿ N/117°07¿46.1¿ W.

Temporal Representation:

Three to four samples are collected per monitoring year. Samples were collected from October 2004 through March 2006.

Environmental Conditions:

Toxicity testing is conducted on all storm event samples (at least three annually).

QAPP Information:

Quality control conducted in compliance with the Riverside County's quality assurance plan.

QAPP Information Reference(s):

Watershed Annual Progress Report 2004 to 2005 and 2005 to 2006

Line of Evidence (LOE) for Decision ID 111439, Toxicity	Region 9
Temecula Creek

LOE ID:

134679

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 station. Monitoring site: ( 902LTC777 )

Temporal Representation:

The samples were collected between the dates of 2014-09-10 and 2018-08-29.

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111451	Region 9
Temecula Creek

Pollutant:	Aldicarb
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 111451, Aldicarb	Region 9
Temecula Creek

LOE ID:

139550

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldicarb. Although a total of 15 samples were collected, 15 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111451, Aldicarb	Region 9
Temecula Creek

LOE ID:

139549

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldicarb. Although a total of 15 samples were collected, 15 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	127719	Region 9
Temecula Creek

Pollutant:	Ammonia
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. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the 16 samples exceed the water quality threshold. 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. Zero of the 16 samples exceed the water quality threshold, 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 127719, Ammonia	Region 9
Temecula Creek

LOE ID:

185153

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-11 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 127719, Ammonia	Region 9
Temecula Creek

LOE ID:

185352

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-11 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	115503	Region 9
Temecula Creek

Pollutant:	Ammonia (Unionized)
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:

Line of Evidence (LOE) for Decision ID 115503, Ammonia (Unionized)	Region 9
Temecula Creek

LOE ID:

185429

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 21 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The discharge of wastes shall not cause concentrations of un-ionized ammonia (NH3) to exceed 0.025 mg/l (as N) in inland surface waters, enclosed bays and estuaries and coastal lagoons (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 115503, Ammonia (Unionized)	Region 9
Temecula Creek

LOE ID:

185410

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111408	Region 9
Temecula Creek

Pollutant:	Arsenic
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 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. Eight lines of evidence are available in the administrative record to assess this pollutant. Zero of 30 samples exceed the water quality threshold in water for the WARM/COLD beneficial use, zero of 30 samples exceed the water quality threshold in water for the MUN beneficial use, and zero of one sample exceed the water quality threshold in sediment. 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. Zero of 30 samples exceed the water quality threshold in water for the WARM/COLD beneficial use, zero of 30 samples exceed the water quality threshold in water for the MUN beneficial use, zero of one sample exceed the water quality threshold in sediment, and this sample size is sufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is not an associated sediment toxicity data as required by Section 3.6 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111408, Arsenic	Region 9
Temecula Creek

LOE ID:

135164

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000a).

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111408, Arsenic	Region 9
Temecula Creek

LOE ID:

140294

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Arsenic.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Title 22 of the California Code of Regulations which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Maximum Contaminant Level for arsenic is 0.01 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111408, Arsenic	Region 9
Temecula Creek

LOE ID:

140257

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Arsenic.

Data Reference:

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 for dissolved arsenic is 0.150 mg/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111408, Arsenic	Region 9
Temecula Creek

LOE ID:

135237

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000a).

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111408, Arsenic	Region 9
Temecula Creek

LOE ID:

140273

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Arsenic.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111408, Arsenic	Region 9
Temecula Creek

LOE ID:

140293

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Arsenic.

Data Reference:

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 for dissolved arsenic is 0.150 mg/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111408, Arsenic	Region 9
Temecula Creek

LOE ID:

140127

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Arsenic.

Data Reference:

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 for dissolved arsenic is 0.150 mg/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111408, Arsenic	Region 9
Temecula Creek

LOE ID:

140430

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Arsenic.

Data Reference:

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 for dissolved arsenic is 0.150 mg/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111409	Region 9
Temecula Creek

Pollutant:	Atrazine
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:

Line of Evidence (LOE) for Decision ID 111409, Atrazine	Region 9
Temecula Creek

LOE ID:

140144

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Atrazine.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of <1 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111409, Atrazine	Region 9
Temecula Creek

LOE ID:

140141

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Atrazine.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of <1 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111410	Region 9
Temecula Creek

Pollutant:	Cadmium
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. Six lines of evidence are available in the administrative record to assess this pollutant. Zero of the 30 samples exceed the water quality threshold for the MUN beneficial use, and zero of the 30 samples exceed the water quality threshold for the WARM/COLD beneficial use. 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. Zero of the 30 samples exceed the water quality threshold for the MUN beneficial use, zero of the 30 samples exceed the water quality threshold for the WARM/COLD beneficial use, 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 111410, Cadmium	Region 9
Temecula Creek

LOE ID:

140685

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Cadmium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111410, Cadmium	Region 9
Temecula Creek

LOE ID:

140551

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Cadmium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111410, Cadmium	Region 9
Temecula Creek

LOE ID:

135957

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for Cadmium in 4.98 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Date for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111410, Cadmium	Region 9
Temecula Creek

LOE ID:

140784

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Cadmium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Title 22 of the California Code of Regulations which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Maximum Contaminant Level for cadmium is 0.005 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111410, Cadmium	Region 9
Temecula Creek

LOE ID:

140702

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Cadmium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Title 22 of the California Code of Regulations which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Maximum Contaminant Level for cadmium is 0.005 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111410, Cadmium	Region 9
Temecula Creek

LOE ID:

135823

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for Cadmium in 4.98 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Date for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111411	Region 9
Temecula Creek

Pollutant:	Carbofuran
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:

Line of Evidence (LOE) for Decision ID 111411, Carbofuran	Region 9
Temecula Creek

LOE ID:

141040

Pollutant:

Carbofuran

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality threshold for Carbofuran.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Title 22 of the California Code of Regulations which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Maximum Contaminant Level for Carbofuran is .0.018 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111412	Region 9
Temecula Creek

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

Regional Board Conclusion:	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 111412, Chlordane	Region 9
Temecula Creek

LOE ID:

136249

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Chlordane. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Chlordane from MacDonald et al., 2000a which states that the probable effect concentration for Chlordane is 17.6 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Date for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111412, Chlordane	Region 9
Temecula Creek

LOE ID:

136248

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Chlordane. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Chlordane from MacDonald et al., 2000a which states that the probable effect concentration for Chlordane is 17.6 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Date for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111457	Region 9
Temecula Creek

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 sections 3.1 and 3.6 of the Listing Policy. Under section 3.1, at least one line of evidence is necessary. 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. Six lines of evidence are available in the administrative record to assess this pollutant. Zero of 30 samples exceed the water quality threshold in water for the MUN beneficial use, zero of 30 samples exceed the water quality threshold in water for the WARM/COLD beneficial use, and zero of one sample exceeds the water quality threshold in sediment. 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. Zero of 30 samples exceed the water quality threshold in water for the MUN beneficial use, zero of 30 samples exceed the water quality threshold in water for the WARM/COLD beneficial use, and this sample size is sufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is not an associated sediment toxicity data as required by Section 3.6 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111457, Chromium	Region 9
Temecula Creek

LOE ID:

141126

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for total chromium is 0.05 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111457, Chromium	Region 9
Temecula Creek

LOE ID:

141298

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for total chromium is 0.05 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111457, Chromium	Region 9
Temecula Creek

LOE ID:

136116

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for Chromium in 111 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111457, Chromium	Region 9
Temecula Creek

LOE ID:

141252

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111457, Chromium	Region 9
Temecula Creek

LOE ID:

141250

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111457, Chromium	Region 9
Temecula Creek

LOE ID:

136280

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for Chromium in 111 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111446	Region 9
Temecula Creek

Pollutant:	Cypermethrin
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 111446, Cypermethrin	Region 9
Temecula Creek

LOE ID:

141883

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cypermethrin. Although a total of 24 samples were collected, 24 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that are toxic to, or produce detrimental physiological responses in, human, plant, animal, or aquatic life (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Evaluation Guideline:

The chronic concentration goal for Cypermethrin is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of Cypermethrin 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 Cypermethrin

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111446, Cypermethrin	Region 9
Temecula Creek

LOE ID:

136831

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15

Evaluation Guideline:

The evaluation guideline for cypermethrin is the median lethal concentration (LC50) of 0.3 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.3 ug/g is the geometric mean of LC50 values for cypermethrin from Maund et al. (2002).

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111446, Cypermethrin	Region 9
Temecula Creek

LOE ID:

141858

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cypermethrin. Although a total of 24 samples were collected, 24 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Cypermethrin

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111446, Cypermethrin	Region 9
Temecula Creek

LOE ID:

136869

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	127275	Region 9
Temecula Creek

Pollutant:	DDD (Dichlorodiphenyldichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127275, DDD (Dichlorodiphenyldichloroethane)	Region 9
Temecula Creek

LOE ID:

136907

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Sum DDD from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDD is 28 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 127275, DDD (Dichlorodiphenyldichloroethane)	Region 9
Temecula Creek

LOE ID:

136922

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Sum DDD from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDD is 28 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	127283	Region 9
Temecula Creek

Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127283, DDE (Dichlorodiphenyldichloroethylene)	Region 9
Temecula Creek

LOE ID:

136718

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Sum DDE from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDE is 31.3 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 127283, DDE (Dichlorodiphenyldichloroethylene)	Region 9
Temecula Creek

LOE ID:

136944

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Sum DDE from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDE is 31.3 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	127358	Region 9
Temecula Creek

Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127358, DDT (Dichlorodiphenyltrichloroethane)	Region 9
Temecula Creek

LOE ID:

136790

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Sum DDT from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDT is 62.9 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 127358, DDT (Dichlorodiphenyltrichloroethane)	Region 9
Temecula Creek

LOE ID:

136807

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Sum DDT from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDT is 62.9 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111455	Region 9
Temecula Creek

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:

Line of Evidence (LOE) for Decision ID 111455, Deltamethrin	Region 9
Temecula Creek

LOE ID:

142124

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 1 of the 2 samples exceeded the water quality threshold for Deltamethrin. Although a total of 25 samples were collected, 23 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Deltamethrin is the USEPA Aquatic Life Benchmark of 0.0041 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111455, Deltamethrin	Region 9
Temecula Creek

LOE ID:

137031

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Evaluation Guideline:

The evaluation guideline for deltamethrin is the median lethal concentration (LC50) of 0.79 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.79 ug/g is the geometric mean of LC50 values for deltamethrin from Amweg et al. (2005).

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Date for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111455, Deltamethrin	Region 9
Temecula Creek

LOE ID:

136792

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Date for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111455, Deltamethrin	Region 9
Temecula Creek

LOE ID:

142076

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Deltamethrin is the USEPA Aquatic Life Benchmark of 0.0041 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111459	Region 9
Temecula Creek

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:

Line of Evidence (LOE) for Decision ID 111459, Demeton	Region 9
Temecula Creek

LOE ID:

142060

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Demeton, Total.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recomm. Water Quality criteria, 4-day avg. is 0.1 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111459, Demeton	Region 9
Temecula Creek

LOE ID:

142315

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recomm. Water Quality criteria, 4-day avg. is 0.1 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111415	Region 9
Temecula Creek

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:	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:

Line of Evidence (LOE) for Decision ID 111415, Diazinon	Region 9
Temecula Creek

LOE ID:

142301

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 0 of the 10 samples exceeded the water quality threshold for Diazinon. Although a total of 30 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111415, Diazinon	Region 9
Temecula Creek

LOE ID:

142288

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

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

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111415, Diazinon	Region 9
Temecula Creek

LOE ID:

142252

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 0 of the 14 samples exceeded the water quality threshold for Diazinon. Although a total of 30 samples were collected, 16 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

The USEPA drinking water health advisory for diazinon is 1.4 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111416	Region 9
Temecula Creek

Pollutant:	Dichlorvos
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 111416, Dichlorvos	Region 9
Temecula Creek

LOE ID:

142255

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorvos. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2016-11-21 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111416, Dichlorvos	Region 9
Temecula Creek

LOE ID:

142239

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorvos. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2016-11-21 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111417	Region 9
Temecula Creek

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

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 111417, Dieldrin	Region 9
Temecula Creek

LOE ID:

136974

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Dieldrin from MacDonald et al., 2000a which states that the probable effect concentration for Dieldrin is 61.8 ug/kg dw. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111417, Dieldrin	Region 9
Temecula Creek

LOE ID:

137132

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Dieldrin from MacDonald et al., 2000a which states that the probable effect concentration for Dieldrin is 61.8 ug/kg dw. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111448	Region 9
Temecula Creek

Pollutant:	Dimethoate
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 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 111448, Dimethoate	Region 9
Temecula Creek

LOE ID:

142518

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111448, Dimethoate	Region 9
Temecula Creek

LOE ID:

142353

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.

Evaluation Guideline:

The California Department of Health Services notification level for dimethoate is 1 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111448, Dimethoate	Region 9
Temecula Creek

LOE ID:

142550

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111418	Region 9
Temecula Creek

Pollutant:	Disulfoton
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:

Line of Evidence (LOE) for Decision ID 111418, Disulfoton	Region 9
Temecula Creek

LOE ID:

142539

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

The USEPA drinking water health advisory for disulfoton is 0.7 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111419	Region 9
Temecula Creek

Pollutant:	Dyfonate (Fonofos or Fonophos)
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:

Line of Evidence (LOE) for Decision ID 111419, Dyfonate (Fonofos or Fonophos)	Region 9
Temecula Creek

LOE ID:

142676

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Fonofos.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Fonofos is the maximum acceptable toxicant concentration (MATC) of 0.45 ug/L. The MATC is calculated as the geometric mean of the lowest observed effect concentration (LOEC) of 0.64 ug/L and the no observed effect concentration (NOEC) of 0.31 ug/L, as determined in a 21 day toxicity study with the water flea, Daphnia magna. Threshold values (LOEC and NOEC) are from USEPA Office of Pesticide Programs Ecotoxicity database.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111419, Dyfonate (Fonofos or Fonophos)	Region 9
Temecula Creek

LOE ID:

142658

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Fonofos.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111420	Region 9
Temecula Creek

Pollutant:	Endrin
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 111420, Endrin	Region 9
Temecula Creek

LOE ID:

137117

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Endrin from MacDonald et al., 2000a which states that the probable effect concentration for Endrin is 207 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111420, Endrin	Region 9
Temecula Creek

LOE ID:

137171

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Endrin from MacDonald et al., 2000a which states that the probable effect concentration for Endrin is 207 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111460	Region 9
Temecula Creek

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 111460, Esfenvalerate/Fenvalerate	Region 9
Temecula Creek

LOE ID:

142562

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Criteria Report for Esfenvalerate

Evaluation Guideline:

The chronic concentration goal 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:

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111460, Esfenvalerate/Fenvalerate	Region 9
Temecula Creek

LOE ID:

142422

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Criteria Report for Esfenvalerate

Evaluation Guideline:

Guideline Reference:

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111460, Esfenvalerate/Fenvalerate	Region 9
Temecula Creek

LOE ID:

137460

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Evaluation Guideline:

The evaluation guideline for esfenvalerate/fenvalerate is the median lethal concentration (LC50) of 1.5 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.5 ug/g is the geometric mean of LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005).

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111460, Esfenvalerate/Fenvalerate	Region 9
Temecula Creek

LOE ID:

137340

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111449	Region 9
Temecula Creek

Pollutant:	Ethoprop
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:

Line of Evidence (LOE) for Decision ID 111449, Ethoprop	Region 9
Temecula Creek

LOE ID:

142632

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Ethoprop.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111449, Ethoprop	Region 9
Temecula Creek

LOE ID:

142398

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Ethoprop.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111447	Region 9
Temecula Creek

Pollutant:	Ethyl p-nitrophenyl (EPN)
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:

Line of Evidence (LOE) for Decision ID 111447, Ethyl p-nitrophenyl (EPN)	Region 9
Temecula Creek

LOE ID:

142372

Pollutant:

Ethyl p-nitrophenyl (EPN)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for EPN.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for EPN is the LC50 of 6.8 ug/L for Gammarus fasciatus (Scud) (USEPA Office of Pesticide Programs Ecotoxicity database).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111447, Ethyl p-nitrophenyl (EPN)	Region 9
Temecula Creek

LOE ID:

142374

Pollutant:

Ethyl p-nitrophenyl (EPN)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for EPN.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for EPN is the LC50 of 6.8 ug/L for Gammarus fasciatus (Scud) (USEPA Office of Pesticide Programs Ecotoxicity database).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111458	Region 9
Temecula Creek

Pollutant:	Fenpropathrin
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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the 24 samples exceed the water quality threshold. 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. Zero of 24 samples exceeded the water quality threshold, 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 111458, Fenpropathrin	Region 9
Temecula Creek

LOE ID:

137327

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenpropathrin. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Evaluation Guideline:

The evaluation guideline for fenpropathrin is the median lethal concentration (LC50) of 1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1 ug/g is the geometric mean of LC50 values for fenpropathrin from Ding et al. ( 2011).

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Date for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111458, Fenpropathrin	Region 9
Temecula Creek

LOE ID:

137307

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenpropathrin. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Date for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111458, Fenpropathrin	Region 9
Temecula Creek

LOE ID:

142776

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality threshold for Fenpropathrin.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Fenpropathrin is the USEPA Aquatic Life Benchmark of 0.06 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111458, Fenpropathrin	Region 9
Temecula Creek

LOE ID:

142739

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Fenpropathrin is the USEPA Aquatic Life Benchmark of 0.06 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111422	Region 9
Temecula Creek

Pollutant:	Lead
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 sections 3.1 and 3.6 of the Listing Policy. Under section 3.1 a single line of evidence is necessary, and under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List. Three lines of evidence are available in the administrative record to assess this pollutant. Zero of the 30 samples exceed the water quality threshold for the WARM/COLD beneficial use. Zero of the 30 samples exceed the water quality threshold for the MUN beneficial use. Zero of one sediment sample exceeds the water quality threshold for sediment; this sample size is not sufficient to determine beneficial use support with the power and confidence of the Listing Policy. 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. Zero of 30 samples exceeded the threshold, 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 111422, Lead	Region 9
Temecula Creek

LOE ID:

137669

Pollutant:

Lead

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Lead .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for lead in 128 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111422, Lead	Region 9
Temecula Creek

LOE ID:

137614

Pollutant:

Lead

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Lead .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for lead in 128 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111422, Lead	Region 9
Temecula Creek

LOE ID:

143155

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Lead.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Title 22 of the California Code of Regulations which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Maximum Contaminant Level for lead is .015 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111422, Lead	Region 9
Temecula Creek

LOE ID:

143254

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Lead.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Title 22 of the California Code of Regulations which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Maximum Contaminant Level for lead is .015 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111422, Lead	Region 9
Temecula Creek

LOE ID:

143138

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Lead.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111422, Lead	Region 9
Temecula Creek

LOE ID:

143255

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Lead.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111423	Region 9
Temecula Creek

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:	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 111423, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 9
Temecula Creek

LOE ID:

137805

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Lindane from MacDonald et al., 2000a which states that the probable effect concentration for Lindane is 4.99 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111423, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 9
Temecula Creek

LOE ID:

137267

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Lindane from MacDonald et al., 2000a which states that the probable effect concentration for Lindane is 4.99 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111424	Region 9
Temecula Creek

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:

Line of Evidence (LOE) for Decision ID 111424, Malathion	Region 9
Temecula Creek

LOE ID:

143178

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Malathion.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

The USEPA drinking water health advisory for malathion is 500 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111424, Malathion	Region 9
Temecula Creek

LOE ID:

220986

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Malathion.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA national ambient water quality criteria for freshwater aquatic life instantaneous maximum for malathion is 0.1 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111444	Region 9
Temecula Creek

Pollutant:	Methiocarb
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 111444, Methiocarb	Region 9
Temecula Creek

LOE ID:

143143

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Methiocarb. Although a total of 15 samples were collected, 15 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for a invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111444, Methiocarb	Region 9
Temecula Creek

LOE ID:

143144

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Methiocarb. Although a total of 15 samples were collected, 15 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for a invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111452	Region 9
Temecula Creek

Pollutant:	Naled
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 111452, Naled	Region 9
Temecula Creek

LOE ID:

143640

Pollutant:

Naled

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Naled. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Naled is the USEPA Aquatic Life Benchmark of 0.045 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2016-11-21 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111452, Naled	Region 9
Temecula Creek

LOE ID:

143621

Pollutant:

Naled

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Naled. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Naled is the USEPA Aquatic Life Benchmark of 0.045 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2016-11-21 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111426	Region 9
Temecula Creek

Pollutant:	Nickel
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 sections 3.1 and 3.6 of the Listing Policy. Under section 3.1 a single line of evidence is necessary, and under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List. Three lines of evidence are available in the administrative record to assess this pollutant. Zero of the 30 samples exceed the water quality threshold for the WARM/COLD beneficial use, and zero of the 29 samples exceed the water quality threshold for the MUN beneficial use. Zero of one sediment sample exceeds the water quality threshold for sediment; this sample size is not sufficient to determine beneficial use support with the power and confidence of the Listing Policy. 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. Zero of 30 samples exceed the threshold for the WARM/COLD beneficial use, and zero of 29 samples exceed the threshold for the MUN beneficial use, 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 111426, Nickel	Region 9
Temecula Creek

LOE ID:

143635

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111426, Nickel	Region 9
Temecula Creek

LOE ID:

143596

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nickel is 0.1 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111426, Nickel	Region 9
Temecula Creek

LOE ID:

138196

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for nickel in 48.6 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111426, Nickel	Region 9
Temecula Creek

LOE ID:

143605

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nickel is 0.1 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111426, Nickel	Region 9
Temecula Creek

LOE ID:

138254

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for nickel in 48.6 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111426, Nickel	Region 9
Temecula Creek

LOE ID:

143716

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	127823	Region 9
Temecula Creek

Pollutant:	Nitrogen, Nitrite
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One lines of evidence are available in the administrative record to assess this pollutant. Zero of the 30 samples exceed the water quality threshold. 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. Zero of the 30 samples exceed the water quality threshold 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 127823, Nitrogen, Nitrite	Region 9
Temecula Creek

LOE ID:

143920

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111427	Region 9
Temecula Creek

Pollutant:	Oxamyl (Vydate)
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:

Line of Evidence (LOE) for Decision ID 111427, Oxamyl (Vydate)	Region 9
Temecula Creek

LOE ID:

144573

Pollutant:

Oxamyl (Vydate)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality threshold for Oxamyl.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Oxamyl is 50 ug/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111428	Region 9
Temecula Creek

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. Five line(s) of evidence are available in the administrative record to assess this pollutant. One of the 30 samples exceed the water quality threshold. 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. One of 30 samples exceeded the water quality threshold, 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:	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 111428, Oxygen, Dissolved	Region 9
Temecula Creek

LOE ID:

144762

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB9 Monitoring data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111428, Oxygen, Dissolved	Region 9
Temecula Creek

LOE ID:

144556

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 6 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-09-19 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111428, Oxygen, Dissolved	Region 9
Temecula Creek

LOE ID:

144709

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with the WARM beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-09-19 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Data for Various Pollutants in Riverside County, 2007-2009.

Line of Evidence (LOE) for Decision ID 111428, Oxygen, Dissolved	Region 9
Temecula Creek

LOE ID:

77111

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of 7 samples exceeded the objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 5.0 mg/l in inland surface waters with designated MAR or WARM beneficial uses. The annual mean dissolved oxygen concentration shall not be less than 7 mg/l more than 10% of the time.

Objective/Criterion Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Temecula Creek station.

Temporal Representation:

Samples were collected seven times between 2007 and 2009.

Environmental Conditions:

QAPP Information:

NPDES quality assurance.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111428, Oxygen, Dissolved	Region 9
Temecula Creek

LOE ID:

144456

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):


DECISION ID	111429	Region 9
Temecula Creek

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 111429, Parathion	Region 9
Temecula Creek

LOE ID:

144917

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 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:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA recommended freshwater aquatic life ambient water quality chronic criteria for Parathion is 0.013 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2016-11-21 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111429, Parathion	Region 9
Temecula Creek

LOE ID:

145006

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA recommended freshwater aquatic life ambient water quality chronic criteria for Parathion is 0.013 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2016-11-21 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111450	Region 9
Temecula Creek

Pollutant:	Phorate
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:

Line of Evidence (LOE) for Decision ID 111450, Phorate	Region 9
Temecula Creek

LOE ID:

145719

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Phorate.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

National Academy of Sciences - Volume I Drinking Water and Health

Evaluation Guideline:

The national academy of sciences no-adverse effect level in drinking water for phorate is 0.7 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111450, Phorate	Region 9
Temecula Creek

LOE ID:

145738

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Phorate.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111450, Phorate	Region 9
Temecula Creek

LOE ID:

145756

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Phorate.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111453	Region 9
Temecula Creek

Pollutant:	Phosmet
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:

Line of Evidence (LOE) for Decision ID 111453, Phosmet	Region 9
Temecula Creek

LOE ID:

145585

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Phosmet is the USEPA Aquatic Life Benchmark of 0.8 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111453, Phosmet	Region 9
Temecula Creek

LOE ID:

145587

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Phosmet is the USEPA Aquatic Life Benchmark of 0.8 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111453, Phosmet	Region 9
Temecula Creek

LOE ID:

145586

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

IRIS Reference Summary (Various Pollutants)

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for phosmet is 140 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111432	Region 9
Temecula Creek

Pollutant:	Selenium
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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the 30 samples exceed the water quality threshold. 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. Zero of 30 samples exceeded the threshold, 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 111432, Selenium	Region 9
Temecula Creek

LOE ID:

146540

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Selenium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Title 22 of the California Code of Regulations which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California MCL for Selenium is .05 mg/L (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111432, Selenium	Region 9
Temecula Creek

LOE ID:

146160

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Selenium.

Data Reference:

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 0.005 mg/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111432, Selenium	Region 9
Temecula Creek

LOE ID:

146188

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality threshold for Selenium.

Data Reference:

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 0.005 mg/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-11 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111432, Selenium	Region 9
Temecula Creek

LOE ID:

146136

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Selenium.

Data Reference:

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 0.005 mg/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111432, Selenium	Region 9
Temecula Creek

LOE ID:

146605

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality threshold for Selenium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Title 22 of the California Code of Regulations which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California MCL for Selenium is .05 mg/L (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-11 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111432, Selenium	Region 9
Temecula Creek

LOE ID:

146624

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality threshold for Selenium.

Data Reference:

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 0.005 mg/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-11 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111433	Region 9
Temecula Creek

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

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the 30 samples exceed the water quality threshold. 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. Zero of 30 samples exceeded the threshold 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 111433, Silver	Region 9
Temecula Creek

LOE ID:

146909

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Silver.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Table 64449-A of section 64449 of Title 22 of the California Code of Regulations (Secondary Maximum Contaminant Levels, Consumer Acceptance Limits) which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Secondary MCL for silver is 0.1 mg/L (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111433, Silver	Region 9
Temecula Creek

LOE ID:

146853

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Silver.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion maximum concentrations 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.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111433, Silver	Region 9
Temecula Creek

LOE ID:

146360

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Silver.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111433, Silver	Region 9
Temecula Creek

LOE ID:

147006

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality threshold for Silver.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Table 64449-A of section 64449 of Title 22 of the California Code of Regulations (Secondary Maximum Contaminant Levels, Consumer Acceptance Limits) which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Secondary MCL for silver is 0.1 mg/L (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-11 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111434	Region 9
Temecula Creek

Pollutant:	Simazine
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:

Line of Evidence (LOE) for Decision ID 111434, Simazine	Region 9
Temecula Creek

LOE ID:

146822

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Simazine.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-05-24

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111434, Simazine	Region 9
Temecula Creek

LOE ID:

146800

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Simazine.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-05-24

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	127399	Region 9
Temecula Creek

Pollutant:	Specific Conductivity
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. Two lines of evidence are available in the administrative record to assess this pollutant. Twenty-four of the 32 samples exceed the California Secondary MCL for Specific Conductivity. However, this is a recommended, not required value, which is lower than the upper and short-term acceptable ranges in Table 64449-B and is lower than the naturally occurring specific conductance in some southern California streams. This water quality threshold will be reevaluated for future Integrated Report cycles.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 127399, Specific Conductivity	Region 9
Temecula Creek

LOE ID:

146881

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Table 64449-A of section 64449 of Title 22 of the California Code of Regulations (Secondary Maximum Contaminant Levels, Consumer Acceptance Limits) which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Secondary MCL for specific conductance is 900 uS/cm (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127399, Specific Conductivity	Region 9
Temecula Creek

LOE ID:

146844

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 23 of 31 samples exceeded the water quality threshold for SpecificConductivity.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Table 64449-A of section 64449 of Title 22 of the California Code of Regulations (Secondary Maximum Contaminant Levels, Consumer Acceptance Limits) which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Secondary MCL for specific conductance is 900 uS/cm (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-09-19 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111442	Region 9
Temecula Creek

Pollutant:	Surfactants (MBAS)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the 187 samples exceed the water quality threshold. 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. Zero of 187 samples exceeded the threshold, 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:	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 111442, Surfactants (MBAS)	Region 9
Temecula Creek

LOE ID:

143362

Pollutant:

Surfactants (MBAS)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality threshold for MBAS.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for MBAS is 0.5 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-03-23

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111442, Surfactants (MBAS)	Region 9
Temecula Creek

LOE ID:

3160

Pollutant:

Surfactants (MBAS)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

160

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data were collected by Rancho California Water District from 1999 to 2002. None of the 160 samples were in exceedance (RCWD, 2002).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for MBAS is 0.5 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.

Objective/Criterion Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Temecula Creek.

Temporal Representation:

Samples were collected 4-5 times per month from 03/31/1999 to 04/17/2002.

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):


DECISION ID	111436	Region 9
Temecula Creek

Pollutant:	Terbufos
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:

Line of Evidence (LOE) for Decision ID 111436, Terbufos	Region 9
Temecula Creek

LOE ID:

147203

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Terbufos.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

The USEPA drinking water health advisory for terbufos is 0.4 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2016-11-21 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111436, Terbufos	Region 9
Temecula Creek

LOE ID:

147225

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Terbufos. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2016-11-21 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111436, Terbufos	Region 9
Temecula Creek

LOE ID:

147201

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Terbufos. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for a invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2016-11-21 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111437	Region 9
Temecula Creek

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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the 30 samples exceed the water quality threshold. 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. Zero of 30 samples exceeded the threshold, 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 111437, Thallium	Region 9
Temecula Creek

LOE ID:

147296

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Thallium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The thallium criterion for the protection of human health from the consumption of water and organisms is 1.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111437, Thallium	Region 9
Temecula Creek

LOE ID:

147295

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Thallium.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The thallium criterion for the protection of human health from the consumption of water and organisms is 1.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	127454	Region 9
Temecula Creek

Pollutant:	Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
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:

Line of Evidence (LOE) for Decision ID 127454, Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)	Region 9
Temecula Creek

LOE ID:

139346

Pollutant:

Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Total DDTs from MacDonald et al., 2000a which states that the probable effect concentration for Total DDTs is 572 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 127454, Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)	Region 9
Temecula Creek

LOE ID:

139050

Pollutant:

Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Total DDTs from MacDonald et al., 2000a which states that the probable effect concentration for Total DDTs is 572 ug/kg. (dw = Dry Weight)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111441	Region 9
Temecula Creek

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

Regional Board Conclusion:	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 3.1 a single line of evidence is necessary, and under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the 30 samples exceed the water quality threshold for the WARM/COLD beneficial use. Zero of the 30 samples exceed the water quality threshold for the MUN beneficial use. Zero of one sediment sample exceeds the water quality threshold for sediment; this sample size is not sufficient to determine beneficial use support with the power and confidence of the Listing Policy. 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. Zero of 30 samples exceeded the threshold, 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 111441, Zinc	Region 9
Temecula Creek

LOE ID:

148188

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Title 22 of the California Code of Regulations which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Secondary MCL for zinc is 5.0 mg/L (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111441, Zinc	Region 9
Temecula Creek

LOE ID:

148162

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the maximum contaminant levels specified in Title 22 of the California Code of Regulations which is incorporated by reference into this plan. (Water Quality Control Plan, San Diego Basin). The California Secondary MCL for zinc is 5.0 mg/L (Title 22 California Code of Regulations).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111441, Zinc	Region 9
Temecula Creek

LOE ID:

147880

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111441, Zinc	Region 9
Temecula Creek

LOE ID:

148138

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111441, Zinc	Region 9
Temecula Creek

LOE ID:

139483

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Zinc .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for zinc in 459 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111441, Zinc	Region 9
Temecula Creek

LOE ID:

139322

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Zinc .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for zinc in 459 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Data for Various Pollutants in Riverside County, 2007-2009.


DECISION ID	111430	Region 9
Temecula Creek

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. Two line(s) of evidence are available in the administrative record to assess this pollutant. Three of the 30 samples exceed the water quality threshold. 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. Three of 30 samples exceeded the water quality threshold, 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:	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 111430, pH	Region 9
Temecula Creek

LOE ID:

77112

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of 8 samples exceeded the objective.

Data Reference:

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:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Temecula Creek station.

Temporal Representation:

Eight samples were between 2007 and 2009.

Environmental Conditions:

QAPP Information:

NPDES quality assurance.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111430, pH	Region 9
Temecula Creek

LOE ID:

145178

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 3 of 22 samples exceeded the water quality threshold for pH.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-09-19 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111430, pH	Region 9
Temecula Creek

LOE ID:

145121

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 3 of 22 samples exceeded the water quality threshold for pH.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-09-19 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	126474	Region 9
Temecula Creek

Pollutant:	Benthic Community Effects
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Benthic Community Effects are 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 (LOEs) associating the Benthic Community Effects decision with a water or sediment concentration of pollutants other than benthic-macroinvertebrate bioassessment or habitat assessment LOEs are necessary to place a water body on the 303(d) List for Benthic Community Effects. Two line(s) of evidence evaluating benthic-macroinvertebrate bioassessment data is/are available in the administrative record to assess this indicator. Seven of seven benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. One sample was a same day replicate. These data indicate that the waterbody is likely impaired for Benthic Community Effects. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing Benthic Community Effects in this waterbody 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. Seven of seven benthic-macroinvertebrate bioassessment samples had CSCI scores below 0.79. One sample was a same day replicate Therefore, this water body is exceeding the water quality threshold for the protection of the WARM and/or COLD beneficial use. 4. Pursuant to section 3.9 of the Listing Policy, the water segment has associated pollutant(s) samples that exceed water quality objectives. 5. 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 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

142802

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 12 of 30 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life (Water Quality Control Plan for the San Diego Basin).

Objective/Criterion Reference:

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations are intended protect aquatic organisms from chronic exposures (expressed as 4-day average concentration) in freshwater. The evaluation guideline for iron is 1,000 ug/L to protect warm freshwater habitat.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

California Stream Condition Index Scores for the 2020 Integrated Report

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

215830

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 902TCI15x to determine beneficial use support and the results are as follows: 2 of 2 samples exceeded the threshold. CSCI scores were from 0.59953834 to 0.62101373 .

Data Reference:

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 Regional Board. Region 9 Basin Plan.

Objective/Criterion Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Evaluation Guideline:

The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rhen, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.

Guideline Reference:

Spatial Representation:

Samples were collected from station 902TCI15x

Temporal Representation:

Samples were collected from 5/7/2014 to 5/7/2014.

Environmental Conditions:

QAPP Information:

The data was collected under a permit required receiving waters monitoring and reporting program

QAPP Information Reference(s):

Quality Assurance Project Plan for Southern California Regional Watershed Monitoring Program Bioassessment, Version 1.0, and Freshwater Bioassessment from Weston Solutions.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

140540

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 10 of 10 samples exceeded the water quality threshold for Bifenthrin.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The chronic concentration goal 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:

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2014-02-28 and 2017-02-19

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

144456

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

144556

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Dissolved oxygen levels shall not be less than 6.0 mg/l in inland surface waters with the COLD beneficial use designated (Water Quality Control Plan, San Diego Basin).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-09-19 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

145266

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 2 of 5 samples exceeded the water quality threshold for Permethrin.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The chronic concentration goal 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

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2014-02-28 and 2017-05-17

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

145832

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

145721

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

146181

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 12 of the 13 samples exceeded the water quality threshold for Pyrethroids. Although a total of 26 samples were collected, 13 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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 (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

147117

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

147008

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2013-09-18 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

147143

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Total Dissolved Solids water quality threshold in this HSA is 500 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2014-05-07

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

144287

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

144175

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 14 of 30 samples exceeded the water quality threshold for Nitrogen, Total.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

134679

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 station. Monitoring site: ( 902LTC777 )

Temporal Representation:

The samples were collected between the dates of 2014-09-10 and 2018-08-29.

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

147865

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

147977

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 8 of 31 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-09-19 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

California Stream Condition Index Scores for the 2020 Integrated Report

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

215826

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 902LTC777 to determine beneficial use support and the results are as follows: 5 of 5 samples exceeded the threshold. CSCI scores were from 0.5441 to 0.745132845 .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from station 902LTC777

Temporal Representation:

Samples were collected from 5/15/2013 to 5/24/2018.

Environmental Conditions:

QAPP Information:

The data was collected under a permit required receiving waters monitoring and reporting program

QAPP Information Reference(s):

Quality Assurance Project Plan for Southern California Regional Watershed Monitoring Program Bioassessment, Version 1.0, and Freshwater Bioassessment from Weston Solutions.

Line of Evidence (LOE) for Decision ID 126474, Benthic Community Effects	Region 9
Temecula Creek

LOE ID:

141822

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality threshold for Cyfluthrin.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The chronic concentration goal 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:

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2014-02-28 and 2016-01-06

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111445	Region 9
Temecula Creek

Pollutant:	Bifenthrin
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
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. Six lines of evidence are available in the administrative record to assess this pollutant. Ten of the ten samples exceed the water quality threshold. 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. Ten of the ten samples exceed the water quality threshold, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111445, Bifenthrin	Region 9
Temecula Creek

LOE ID:

140657

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2014-02-28 and 2017-02-19

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111445, Bifenthrin	Region 9
Temecula Creek

LOE ID:

135764

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Evaluation Guideline:

The evaluation guideline for bifenthrin is the median lethal concentration (LC50) of 0.43 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.43 ug/g is the geometric mean of LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007).

Guideline Reference:

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Date for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111445, Bifenthrin	Region 9
Temecula Creek

LOE ID:

140525

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 15 samples were collected, 15 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111445, Bifenthrin	Region 9
Temecula Creek

LOE ID:

140508

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 15 samples were collected, 15 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111445, Bifenthrin	Region 9
Temecula Creek

LOE ID:

135583

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Evaluation Guideline:

Guideline Reference:

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Date for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111445, Bifenthrin	Region 9
Temecula Creek

LOE ID:

140540

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2014-02-28 and 2017-02-19

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111454	Region 9
Temecula Creek

Pollutant:	Cyfluthrin
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
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, at least one line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Three of the three samples exceed the water quality threshold in water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing this water segment-pollutant combination on the 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 of three samples exceeded the water quality threshold in water, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111454, Cyfluthrin	Region 9
Temecula Creek

LOE ID:

141905

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 21 samples were collected, 21 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111454, Cyfluthrin	Region 9
Temecula Creek

LOE ID:

141906

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 21 samples were collected, 21 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111454, Cyfluthrin	Region 9
Temecula Creek

LOE ID:

141862

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality threshold for Cyfluthrin.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2014-02-28 and 2016-01-06

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111454, Cyfluthrin	Region 9
Temecula Creek

LOE ID:

141822

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality threshold for Cyfluthrin.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2014-02-28 and 2016-01-06

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111456	Region 9
Temecula Creek

Pollutant:	Cyhalothrin, Lambda
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
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 the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence are available in the administrative record to assess this pollutant. Five of five samples exceed the water quality threshold in water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing this water segment-pollutant combination on the 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. Five of five samples exceed the water quality threshold in water, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111456, Cyhalothrin, Lambda	Region 9
Temecula Creek

LOE ID:

142994

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 5 of 5 samples exceeded the water quality threshold for Lambda-cyhalothrin.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Criteria Report for Lambda-cyhalothrin

Evaluation Guideline:

The chronic concentration goal 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:

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2015-03-01 and 2017-09-14

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111456, Cyhalothrin, Lambda	Region 9
Temecula Creek

LOE ID:

142944

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 15 samples were collected, 15 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Criteria Report for Lambda-cyhalothrin

Evaluation Guideline:

Guideline Reference:

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-02-08 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111456, Cyhalothrin, Lambda	Region 9
Temecula Creek

LOE ID:

142891

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 15 samples were collected, 15 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Criteria Report for Lambda-cyhalothrin

Evaluation Guideline:

Guideline Reference:

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-02-08 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111456, Cyhalothrin, Lambda	Region 9
Temecula Creek

LOE ID:

142945

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Criteria Report for Lambda-cyhalothrin

Evaluation Guideline:

Guideline Reference:

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2015-03-01 and 2017-09-14

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111421	Region 9
Temecula Creek

Pollutant:	Iron
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
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. Four lines of evidence are available in the administrative record to assess this pollutant. Fourteen of the 30 samples exceed the water quality threshold for the MUN beneficial use. Zero of the 30 samples exceed the water quality threshold for the WARM/COLD beneficial use. 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. Fourteen of 30 samples exceed the waer quality threshold, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111421, Iron	Region 9
Temecula Creek

LOE ID:

142802

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 12 of 30 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111421, Iron	Region 9
Temecula Creek

LOE ID:

142784

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111421, Iron	Region 9
Temecula Creek

LOE ID:

142570

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Iron is 0.3 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111421, Iron	Region 9
Temecula Creek

LOE ID:

142608

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 14 of 30 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Iron is 0.3 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111421, Iron	Region 9
Temecula Creek

LOE ID:

142569

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111421, Iron	Region 9
Temecula Creek

LOE ID:

142804

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 12 of 30 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111425	Region 9
Temecula Creek

Pollutant:	Manganese
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
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. Two lines of evidence are available in the administrative record to assess this pollutant. Twenty-five of the 28 samples exceed the water quality threshold. 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. Twenty-five of 28 samples exceed the threshold, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111425, Manganese	Region 9
Temecula Creek

LOE ID:

143301

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 11 of 30 samples exceeded the water quality threshold for Manganese.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Manganese is 0.05 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111425, Manganese	Region 9
Temecula Creek

LOE ID:

143261

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 25 of 28 samples exceeded the water quality threshold for Manganese.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Manganese is 0.05 mg/L (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	128185	Region 9
Temecula Creek

Pollutant:	Mercury
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One lines of evidence are available in the administrative record to assess this pollutant. Three of the three samples exceed the threshold. 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. Three of three samples exceed the threshold and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 128185, Mercury	Region 9
Temecula Creek

LOE ID:

143398

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 3 of the 3 samples exceeded the water quality threshold for Mercury. Although a total of 26 samples were collected, 23 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria for the protection of human health from the consumption of water and organisms for mercury is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2013-05-15 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 128185, Mercury	Region 9
Temecula Creek

LOE ID:

138109

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury in 1.06 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 128185, Mercury	Region 9
Temecula Creek

LOE ID:

143419

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Mercury. Although a total of 26 samples were collected, 25 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria for the protection of human health from the consumption of water and organisms for mercury is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2013-05-15 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 128185, Mercury	Region 9
Temecula Creek

LOE ID:

137865

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury in 1.06 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	127622	Region 9
Temecula Creek

Pollutant:	Nitrogen
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Delist from 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Reason for Delisting:	Flaws in original listing
Expected TMDL Completion Date:	2033
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. Five lines of evidence are available in the administrative record to assess this pollutant. Fourteen of the 31 samples exceed the water quality threshold. 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. Fourteen of the 31 samples exceed the water quality threshold, 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 127622, Nitrogen	Region 9
Temecula Creek

LOE ID:

143926

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127622, Nitrogen	Region 9
Temecula Creek

LOE ID:

144287

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127622, Nitrogen	Region 9
Temecula Creek

LOE ID:

3159

Pollutant:

Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

160

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by Ranch California Water District from 1999 to 2002. Nineteen of 160 samples were in exceedance (RCWD, 2002).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters, enclosed bays and estuaries, coastal lagoons, and ground waters and all beneficial uses, analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used.

Objective/Criterion Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Temecula Creek.

Temporal Representation:

Samples were collected 4-5 times per month from 03/1999 to 04/2002

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 127622, Nitrogen	Region 9
Temecula Creek

LOE ID:

144175

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 127622, Nitrogen	Region 9
Temecula Creek

LOE ID:

143909

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	130328	Region 9
Temecula Creek

Pollutant:	Permethrin
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
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 3.1 a single line of evidence is necessary to assess listing status. Under section 3.6, at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List. Two lines of evidence are available in the administrative record to assess this pollutant. Two of five samples exceed the water quality threshold in water. Zero of one sample exceeds the water quality threshold in sediment, but this sample size is insufficient to determine beneficial use support with the statistical power and confidence of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of five samples exceed the water quality threshold in water, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 130328, Permethrin	Region 9
Temecula Creek

LOE ID:

138665

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Evaluation Guideline:

The evaluation guideline for permethrin is the median lethal concentration (LC50) of 8.9 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 8.9 ug/g is the geometric mean of LC50 values for permethrin from Amweg et al. (2005).

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 130328, Permethrin	Region 9
Temecula Creek

LOE ID:

138540

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 130328, Permethrin	Region 9
Temecula Creek

LOE ID:

144777

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Permethrin

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 130328, Permethrin	Region 9
Temecula Creek

LOE ID:

145191

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 2 of 5 samples exceeded the water quality threshold for Permethrin.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Permethrin

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2014-02-28 and 2017-05-17

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 130328, Permethrin	Region 9
Temecula Creek

LOE ID:

145190

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek 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 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Permethrin

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 (902LTC777).

Temporal Representation:

Date for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 130328, Permethrin	Region 9
Temecula Creek

LOE ID:

145266

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 2 of 5 samples exceeded the water quality threshold for Permethrin.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Permethrin

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 (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2014-02-28 and 2017-05-17

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111443	Region 9
Temecula Creek

Pollutant:	Pyrethroids
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
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 3.1 a single line of evidence is necessary to assess listing status. Under section 3.6, at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List. Four lines of evidence are available in the administrative record to assess this pollutant. Twelve of 13 samples exceed the water quality threshold in water. Zero of one sample exceeds the water quality threshold in sediment, but this sample size is insufficient to determine beneficial use support with the statistical power and confidence of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing this water segment-pollutant combination on the 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. Twelve of 13 samples exceed the water quality threshold in water, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111443, Pyrethroids	Region 9
Temecula Creek

LOE ID:

146181

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

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 (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111443, Pyrethroids	Region 9
Temecula Creek

LOE ID:

139165

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Evaluation Guideline:

The evaluation guideline for the protection of aquatic life from pyrethroids is one toxic unit equivalent. A toxic unit equivalent is equal to the sum of; Bifenthrin, Cyfluthrin, Cypermethrin, Lambda-Cyhalothrin, and Permethrin, 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 day is considered to be in exceedance of the water quality standard. (Department of Fish and Game Aquatic Life Criteria for Pyrethroid Insecticides, 2000)

Guideline Reference:

Guideline Reference:

Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: ll. Pyrethroid insecticides. Reviews of Environmental Contamination and Toxicology 216:51-103.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111443, Pyrethroids	Region 9
Temecula Creek

LOE ID:

146195

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

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 (902LTC777).

Temporal Representation:

Data for this waterbody was collected over the date range 2012-10-04 to 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111443, Pyrethroids	Region 9
Temecula Creek

LOE ID:

139006

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Evaluation Guideline:

Guideline Reference:

Guideline Reference:

Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: ll. Pyrethroid insecticides. Reviews of Environmental Contamination and Toxicology 216:51-103.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 902LTC777.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-05-15 to 2013-05-15

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111435	Region 9
Temecula Creek

Pollutant:	Sulfates
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
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. One line of evidence is available in the administrative record to assess this pollutant. Eight of the 30 samples exceed the threshold. 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. Eight of 30 samples exceed the threshold, and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 111435, Sulfates	Region 9
Temecula Creek

LOE ID:

147082

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 8 of 30 samples exceeded the water quality threshold for Sulfate.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Sulfate water quality threshold in this HSA is 250 mg/L, and this concentration is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-10-04 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.


DECISION ID	111440	Region 9
Temecula Creek

Pollutant:	Turbidity
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
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. Seven lines of evidence are available in the administrative record to assess this pollutant. Eleven of the 33 samples exceed the water quality threshold. 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. Eleven of 33 samples exceed the threshold and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board 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 111440, Turbidity	Region 9
Temecula Creek

LOE ID:

147824

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111440, Turbidity	Region 9
Temecula Creek

LOE ID:

3156

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by RWQCB 9 in 1998. One sample was collected and was not in exceedance (SWRCB, 2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for turbidity is 5.0 ntu.

Objective/Criterion Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected Temecula Creek east of the confluence, west of I-15.

Temporal Representation:

Samples were collected on 06/09/1998.

Environmental Conditions:

QAPP Information:

Data used in 2002 assessment.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111440, Turbidity	Region 9
Temecula Creek

LOE ID:

147865

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 111440, Turbidity	Region 9
Temecula Creek

LOE ID:

147868

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Sediment, Tissue, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902TCTCR1)

Temporal Representation:

The samples were collected between the dates of 2012-03-16 and 2012-03-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008, Nagoda and Busse, 2013. Quality Assurance Project Plan for Screening of Cyanotoxins in Lakes/Reservoirs and Coastal Wetlands in the San Diego Region, SWAMP QAPrP 2017

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 111440, Turbidity	Region 9
Temecula Creek

LOE ID:

147911

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 8 of 31 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-09-19 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111440, Turbidity	Region 9
Temecula Creek

LOE ID:

147914

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 11 of 31 samples exceeded the water quality threshold for Turbidity.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Secondary California Maximum Contaminant Level for Turbidity is 5 NTU (Title 22 of the California Code of Regulations).

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-09-19 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):

Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 9.

Line of Evidence (LOE) for Decision ID 111440, Turbidity	Region 9
Temecula Creek

LOE ID:

147977

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed San Diego Region data for Temecula Creek to determine beneficial use support and results are as follows: 8 of 31 samples exceeded the water quality threshold for Turbidity.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Turbidity water quality threshold in this HSA is 20 NTU, and this level is not to be exceeded more than 10% of the time during any one year period (Basin Plan, Table 3-2).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (902LTC777)

Temporal Representation:

The samples were collected between the dates of 2012-09-19 and 2018-08-29

Environmental Conditions:

QAPP Information:

Riverside County. 2018. Volume II: Quality Assurance Project Plan.

QAPP Information Reference(s):


DECISION ID	68838	Region 9
Temecula Creek

Pollutant:	Boron
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:	The decision has not changed from the previous listing cycle. No new data were assessed for the current listing cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None of 160 of the samples exceed the Basin Plan water quality objective for Boron. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of 160 of the samples exceed the Basin Plan water quality objective for Boron and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 68838, Boron	Region 9
Temecula Creek

LOE ID:

3161

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

160

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data were collected by Rancho California Water District from 1999 to 2002. None of the 160 samples were in exceedance (RCWD, 2002).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for boron is 0.75 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.

Objective/Criterion Reference: