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

Water Quality Control Plan for the Santa Ana River Basin

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Objective: 6.5 - 8.5 pH units

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at one station in Chino Creek at Schaefer Avenue

Temporal Representation:

The samples were collected several times per month starting on 7/3/2003 through 2/21/2007.

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because it originated from an NPDES discharger in compliance with their monitoring and reporting program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132761, pH	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

237382

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Limited Warmwater

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB8 Monitoring data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The pH of inland surface waters shall not be raised above 8.5 or depressed below 6.5 as a result of controllable water quality factors (The Water Quality Control Plan, Santa Ana Basin, Chapter 4 Water Quality Objectives, Inland Surface Waters).

Objective/Criterion Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8521 (Chino Creek Random Olsen Site 521).

Temporal Representation:

The samples were collected between the dates of 2011-06-06 and 2011-06-06

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132761, pH	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

237341

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Limited Warmwater

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB8 Monitoring data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8197 (Chino Creek Random Olsen Site 197).

Temporal Representation:

The samples were collected between the dates of 2011-07-11 and 2013-07-01

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132761, pH	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

237321

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Limited Warmwater

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Middle Santa Ana River TMDL Monitoring Project data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and results are as follows: 9 of 10 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Santa Ana River Watershed Bacteria Monitoring Program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CHINOCRK (Chino Creek upstream of San Antonio Channel).

Temporal Representation:

The samples were collected between the dates of 2011-04-19 and 2019-09-03

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132761, pH	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

237317

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Limited Warmwater

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Middle Santa Ana River TMDL Monitoring Project data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Santa Ana River Watershed Bacteria Monitoring Program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: T1-BRSC (BRSC).

Temporal Representation:

The samples were collected between the dates of 2019-08-06 and 2019-09-03

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132761, pH	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

237185

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Limited Warmwater

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed RWB8 So. CA Stormwater Monitoring Coalition data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for pH.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 801S04078 (Chino Creek Random SMC Site 04078).

Temporal Representation:

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

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132761, pH	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

239639

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Limited Warmwater

Number of Samples:

243

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_IEUA Regional Plant No. 5 data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and results are as follows: 54 of 243 samples exceeded the water quality threshold for pH.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 8.

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: 745835 (R-003U).

Temporal Representation:

The samples were collected between the dates of 2011-06-08 and 2020-10-07

Environmental Conditions:

QAPP Information:

IEUA. 2019. Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 8.

Line of Evidence (LOE) for Decision ID 132761, pH	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

239636

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Limited Warmwater

Number of Samples:

236

Number of Exceedances:

171

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_IEUA Regional Plant No. 5 data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and results are as follows: 171 of 236 samples exceeded the water quality threshold for pH.

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: 745837 (R-004U).

Temporal Representation:

The samples were collected between the dates of 2011-06-14 and 2020-10-07

Environmental Conditions:

QAPP Information:

IEUA. 2019. Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

Field, Habitat, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.


DECISION ID	149140	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

Pollutant:	Indicator Bacteria
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2018)
Revision Status	Revised
Sources:	Unknown Nonpoint Source
TMDL Name:	Middle Santa Ana River Watershed Bacterial Indicator TMDLs
TMDL Project Code:	90
Date TMDL Approved by USEPA:	05/16/2007
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. 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 removal from the CWA section 303(d) List under section 4.3 of the Listing Policy using the E. coli objective. A total of four (4) lines of evidence of E. coli data were evaluated for this waterbody. Of these lines of evidence, four (4) are based on recent E. coli data, collected since 2010, and compared to the newer E. coli bacteria water quality 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. 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 failure to address a human health risk. The four (4) recent E. coli lines of evidence were relied upon to assess water quality standards attainment in this waterbody. The data were collected from 2010-2019. There are adequate data to determine beneficial use support in accordance with the Listing Policy. Ten out of 10 samples exceed the 6-week E.Coli Geomean objective. 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. Ten out of the 10 samples exceeded the E. coli Geomean Objective and this does exceed the allowable frequency listed in Table 3.2 of the Listing Policy. This exceedance rate still supports the original listing decision based on Table 3.2 because the use support rating cannot change until there are at least 26 samples and less than or equal to 4 exceedances. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. The historic LOE for Coliform bacteria (2988) will be retired. From 2010 Listing Cycle: This pollutant is being considered for listing under section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. The Prado Area Streams Pathogen TMDL was approved by RWQCB on 2007 and subsequently approved by USEPA on 5/16/07. Based on the readily available information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list.

Regional Board Decision Recommendation:	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:	From 2010 Listing Cycle: This pollutant is being considered for listing under section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. The Prado Area Streams Pathogen TMDL was approved by RWQCB on 2007 and subsequently approved by USEPA on 5/16/07. Based on the readily available information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list.

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 149140, Indicator Bacteria	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

300938

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

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 Middle Santa Ana River TMDL Monitoring Project data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and the results are as follows: 2 of the 2 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective to protect the REC-1 beneficial use for waters where the salinity is equal to or less than 1 part per thousand 95 percent or more of the time applies a rolling six-week geometric mean of E. coli, not to exceed 100 cfu/100 mL (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): T1-BRSC (BRSC).

Temporal Representation:

The samples were collected between the days of 2019-07-30 and 2019-09-03 .

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Santa Ana River Watershed Bacteria Monitoring Program

Line of Evidence (LOE) for Decision ID 149140, Indicator Bacteria	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

300897

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

STV

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 Middle Santa Ana River TMDL Monitoring Project data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and the results are as follows: 4 of the 6 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:

Field, Habitat, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective to protect the REC-1 beneficial use where the salinity is less than 1 parts per thousand 95 percent or more of the time applies a statistical threshold value to E. coli of 320 cfu/100 mL, not to be exceeded by more than 10 percent of samples within a calendar month (ISWEBE 2018).

Objective/Criterion Reference:

Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): CHINOCRK (Chino Creek upstream of San Antonio Channel).

Temporal Representation:

The samples were collected between the days of 2011-04-19 and 2019-09-03 .

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Santa Ana River Watershed Bacteria Monitoring Program

Line of Evidence (LOE) for Decision ID 149140, Indicator Bacteria	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

300933

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

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 Middle Santa Ana River TMDL Monitoring Project data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and the results are as follows: 8 of the 8 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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): CHINOCRK (Chino Creek upstream of San Antonio Channel).

Temporal Representation:

The samples were collected between the days of 2011-04-19 and 2019-09-03 .

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Santa Ana River Watershed Bacteria Monitoring Program

Line of Evidence (LOE) for Decision ID 149140, Indicator Bacteria	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

300902

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

STV

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 Middle Santa Ana River TMDL Monitoring Project data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and the results are as follows: 3 of the 3 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:

Field, Habitat, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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): T1-BRSC (BRSC).

Temporal Representation:

The samples were collected between the days of 2019-07-30 and 2019-09-03 .

Environmental Conditions:

QAPP Information:

CDM Smith. 2019. Santa Ana River Watershed Bacteria Monitoring Program.

QAPP Information Reference(s):

Santa Ana River Watershed Bacteria Monitoring Program


DECISION ID	132229	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio 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:	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 132229, Arsenic	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

234818

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Aquatic Life Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The only sample collected did not exceed the guideline.

Data Reference:

Water Quality Control Plan for the Santa Ana River Basin

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentration of toxic substance in the water column, sediments or biota shall not adversely affect beneficial uses (SARWQCB, 1995).

Objective/Criterion Reference:

Evaluation Guideline:

CTR Fresh Water Aquatic Life Protection 4-day Average continuous concentration: Arsenic - 150 ppb

Guideline Reference:

Spatial Representation:

The sample was collected in Chino Creek at Pine Avenue.

Temporal Representation:

The sample was collected on 3/24/2006.

Environmental Conditions:

QAPP Information:

The data quality is deemed acceptable because it was submitted by an NPDES discharger in accordance with their Monitoring and Reporting Requirements.

QAPP Information Reference(s):

This is a placeholder for previously assessed data that does not have quality assurance information but would require it under newly developed policies. These LOEs were previously assessed and approved at the Regional, State and Federal level in past cycles. The LOEs needed to be moved and/or reassessed but required this reference code for movement within the decision making database.


DECISION ID	132760	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

Pollutant:	Boron
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. None of the 25 samples exceed the OBJECTIVE. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the 25 samples exceeded the OBJECTIVE and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 132760, Boron	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

239679

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Groundwater Recharge

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_IEUA Regional Plant No. 5 data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Boron.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 8.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Boron concentrations shall not exceed 0.75 mg/L in inland surface waters of the region as a result of controllable water quality factors (Water Quality Control Plan, Santa Ana Basin, Chapter 4 Water Quality Objectives, Inland Surface Waters).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 745837 (R-004U).

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2020-10-07

Environmental Conditions:

QAPP Information:

IEUA. 2019. Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 8.

Line of Evidence (LOE) for Decision ID 132760, Boron	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

239685

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Groundwater Recharge

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_IEUA Regional Plant No. 5 data for Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Boron.

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: 745835 (R-003U).

Temporal Representation:

The samples were collected between the dates of 2011-11-01 and 2020-10-07

Environmental Conditions:

QAPP Information:

IEUA. 2019. Laboratory Quality Assurance Manual.

QAPP Information Reference(s):


DECISION ID	149094	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

Pollutant:	Mercury
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 149094, Mercury	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

234557

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Aquatic Life Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The only sample collected did not exceed the guideline.

Data Reference:

Water Quality Control Plan for the Santa Ana River Basin

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentration of toxic substance in the water column, sediments or biota shall not adversely affect beneficial uses (SARWQCB, 1995).

Objective/Criterion Reference:

Evaluation Guideline:

USEPA National Recommended Ambient Water Quality Criteria for Aquatic life protection: Mercury - 0.77 ppb

Guideline Reference:

Spatial Representation:

The sample was collected in Chino Creek at Pine Avenue.

Temporal Representation:

The sample was collected on 3/24/2006.

Environmental Conditions:

QAPP Information:

The data quality is deemed acceptable because it was submitted by an NPDES discharger in accordance with their Monitoring and Reporting Requirements.

QAPP Information Reference(s):


DECISION ID	73813	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

Pollutant:	Sodium
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:	There was no new data considered in the 2014 Listing Cycle, this previously made decision will carryover. The following description applies to an earlier Listing Cycle. This pollutant is being considered for placement on the 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. Nine (9) of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the 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. Nine (9) of seventy-nine (79) samples exceeded the Basin Plan Objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	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. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:	This pollutant is being considered for placement on the 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. Nine (9) of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the 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. Nine (9) of seventy-nine (79) samples exceeded the Basin Plan Objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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 73813, Sodium	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

7949

Pollutant:

Sodium

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:

of the 79 samples collected 9 exceeded the Basin Plan's objective.

Data Reference:

Water Quality Control Plan for the Santa Ana River Basin

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Objective: 7Please note that there is no specific objective in the basin plan for sodium and for that reason the sodium objective for Chino Creek Reach 1b was used to compare the data per the tributary rule.5 mg/l

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at one station in Chino Creek at Schaefer Avenue

Temporal Representation:

The samples were collected several times per month starting on 7/3/2003 through 2/21/2007.

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because it originated from an NPDES discharger in compliance with their monitoring and reporting program.

QAPP Information Reference(s):


DECISION ID	73514	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

Pollutant:	Total Nitrogen as N
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	There was no new data considered in the 2014 Listing Cycle, this previously made decision will carryover. The following description applies to an earlier Listing Cycle. This pollutant is being considered for placement on the 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 (1) line of evidence is available in the administrative record to assess this pollutant. None of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the 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 forty-three (43) samples exceeded the Basin Plan Objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	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. 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 73514, Total Nitrogen as N	Region 8
Chino Creek Reach 2 (Beginning of concrete channel to confl w San Antonio Creek)

LOE ID:

7955

Pollutant:

Total Nitrogen as N

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:

Of the 43 samples taken none exceeded the Basin Plan's objective.

Data Reference: