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

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name:	City Creek (Mountain Reach)
Water Body ID:	CAR8015200020210810034009
Water Body Type:	River & Stream


DECISION ID	134186	Region 8
City Creek (Mountain Reach)

Pollutant:	Alkalinity as CaCO3
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

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

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	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 134186, Alkalinity as CaCO3	Region 8
City Creek (Mountain Reach)

LOE ID:

234981

Pollutant:

Alkalinity as CaCO3

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 RWB8 Monitoring data for City Creek (Mountain Reach) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.

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 concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8167 (City Creek Random Olsen Site 167).

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 134186, Alkalinity as CaCO3	Region 8
City Creek (Mountain Reach)

LOE ID:

234980

Pollutant:

Alkalinity as CaCO3

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, 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 concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8167 (City Creek Random Olsen Site 167).

Temporal Representation:

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

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):

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


DECISION ID	150571	Region 8
City Creek (Mountain Reach)

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:	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 150571, Ammonia	Region 8
City Creek (Mountain Reach)

LOE ID:

235293

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:

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 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: 801RB8167 (City Creek Random Olsen Site 167).

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 150571, Ammonia	Region 8
City Creek (Mountain Reach)

LOE ID:

235231

Pollutant:

Nitrogen, ammonia (Total Ammonia)

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, 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 concentrations of contaminants in waters which are existing or potential sources of drinking water shall not occur at levels that are harmful to human health (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to ammonia as a drinking water level is a concentration of 30 mg/L. This Advisory Level is defined as 'the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for up to ten days of exposure.

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8167 (City Creek Random Olsen Site 167).

Temporal Representation:

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

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):

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


DECISION ID	132169	Region 8
City Creek (Mountain Reach)

Pollutant:	Arsenic
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the 24 samples exceed the WILD Arsenic criterion. 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 24 samples exceed the WILD Arsenic criterion and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 132169, Arsenic	Region 8
City Creek (Mountain Reach)

LOE ID:

234841

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 6 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

CTR aquatic life: Arsenic 4-day average 150 ug/l, and 1-hour average 340 ug/l

Guideline Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency

Spatial Representation:

The 6 samples were collected at one station on City Creek 2.7 miles north of Highland Avenue (north of mile post 32.35) at City Creek Bridge; at 1/4 mile d/s of confluence of West and East Forks of City Creek. Four hundred thirty five feet east of Highway 330.

Temporal Representation:

The 6 samples were taken on 11/1/1994, 6/6/1995, 8/14/1995, 7/30/1996, 8/20/1997, 7/29/1998.

Environmental Conditions:

QAPP Information:

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

Line of Evidence (LOE) for Decision ID 132169, Arsenic	Region 8
City Creek (Mountain Reach)

LOE ID:

234819

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 18 samples collected in the water column, none exceeded the standards.

Data Reference:

San Bernardino County Flood Control District data from storm water program

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

CTR Aquatic Life: Arsenic 4-day avg. 150 ug/l and 1-hr avg. 340 ug/l

Guideline Reference:

Spatial Representation:

The 18 samples were collected at one station on City Creek, 2.7 miles north of Highland Avenue (north of mile post 32.35) at City Creek Bridge; at 1/4 mile directly south of confluence of West and East Forks of City Creek; 435 feet East of Highway 330.

Temporal Representation:

The 18 samples were taken on 2/17/94, 3/17/94, 11/10/94, 1/23/94, 3/10/95, 12/12/95, 1/31/96, 2/19/1986, 3/4/96, 3/13/96, 10/30/96, 11/21/96, 12/9/96, 11/26/97, 1/9/98, 2/3/98, 3/25/98, 1/25/00

Environmental Conditions:

the samples were obtained as grab samples during the wet weather

QAPP Information:

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

QAPP Information Reference(s):


DECISION ID	153778	Region 8
City Creek (Mountain Reach)

Pollutant:	Benthic Community Effects
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:	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. Three line(s) of evidence evaluating benthic-macroinvertebrate bioassessment data is/are available in the administrative record to assess this indicator. Two of six benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. However, The available information is insufficient to determine whether the waterbody/pollutant combination should be placed on the 303(d) List of impaired waters at this time. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing Benthic Community Effects in this 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. Two of 6 benthic-macroinvertebrate bioassessment samples had CSCI scores below 0.79. The available information is insufficient to determine whether the waterbody/pollutant combination should be placed on the 303(d) List of impaired waters at this time. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 153778, Benthic Community Effects	Region 8
City Creek (Mountain Reach)

LOE ID:

314344

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold 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 801WE1043 to determine beneficial use support and the results are as follows: 2 of 4 samples exceeded the threshold. CSCI scores were from 0.59455938 to 1.263153465.

Data Reference:

California Stream Condition Index (CSCI) Scores for the 2024 Integrated Report for Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Inland surface water communities and populations, including vertebrate, invertebrate, and plant species, shall not be degraded as a result of the discharge of waste. Degradation is damage to an aquatic community or population with the result that balanced community no longer exists. The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

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 (Rehn, 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:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

Samples were collected from station 801WE1043.

Temporal Representation:

Samples were collected from 6/11/2002 to 5/1/2007.

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols.

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 153778, Benthic Community Effects	Region 8
City Creek (Mountain Reach)

LOE ID:

314264

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold 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 801RB8167 to determine beneficial use support and the results are as follows: 0 of 1 samples exceeded the threshold. CSCI scores were from 1.178223113 to 1.178223113.

Data Reference:

California Stream Condition Index (CSCI) Scores for the 2024 Integrated Report for Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

Samples were collected from station 801RB8167.

Temporal Representation:

Samples were collected from 6/26/2012 to 6/26/2012.

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols.

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 153778, Benthic Community Effects	Region 8
City Creek (Mountain Reach)

LOE ID:

314221

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold 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 801CTCNHL to determine beneficial use support and the results are as follows: 0 of 1 samples exceeded the threshold. CSCI scores were from 1.17244028 to 1.17244028.

Data Reference:

California Stream Condition Index (CSCI) Scores for the 2024 Integrated Report for Region 8.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

Samples were collected from station 801CTCNHL.

Temporal Representation:

Samples were collected from 4/18/2014 to 4/18/2014.

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols.

QAPP Information Reference(s):

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


DECISION ID	132392	Region 8
City Creek (Mountain Reach)

Pollutant:	Copper
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 23 samples exceed the WILD Copper criteria. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the 23 samples exceed the WILD Copper criteria and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 132392, Copper	Region 8
City Creek (Mountain Reach)

LOE ID:

234847

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 17 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

California Toxics Rule Aquatic Life for copper: 2/17/94: 12.68 ug/l, 3/19/94: 13.47 ug/l, 11/10/94: 16.10 ug/l, 1/23/95: 10.54 ug/l, 3/10/95: 8.24 ug/l 12/12/95 13.6 ug/l, 1/31/96: 12.68 ug/l, 2/19/96: 9.33 ug/l, 3/4/96: 11.61 ug/l, 3/13/96: 11.61 ug/l, 3/13/96: 11.61 ug/l, 10/30/96: 17.92 ug/l, 11/21/96: 16.62 ug/l, 12/9/96: 15.31 ug/l, 11/26/97: 179.56 ug/l, 1/9/98: 16.62 ug/l, 2/3/98: 15.31 ug/l, 3/25/98: 10.41 ug/l;

Guideline Reference:

Spatial Representation:

The 17 samples were collected at one station on City Creek; 2.7 miles north of Highland Avenue (north of mile post 32.35), 1/4 mile directly south of the confluence of the West and East Forks of City Creek, and 435 feet east of Highway 330.

Temporal Representation:

The 17 samples were taken on 2/17/94, 3/17/94, 11/10/94, 1/23/95, 3/10/95, 12/12/95, 1/31/96, 2/19/96, 3/4/96, 3/13/96, 10/30/96, 11/21/96, 12/9/96, 11/26/97, 1/9/98, 2/3/98 and 3/25/98.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132392, Copper	Region 8
City Creek (Mountain Reach)

LOE ID:

234842

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 6 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

CTR aquatic life: Copper (hardness dependent metal) is as follows on 11/1/94: 14.92 ug/l, 6/6/95: 11.08 ug/l, 8/14/95: 12.68 ug/l, 7/30/96: 17.92 ug/l, 8/20/97: 20.51 ug/l, 7/29/98: 11.48 ug/l.

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 6 samples were taken on 11/1/1994, 6/6/1995, 8/14/1995, 7/30/1996, 8/20/1997, 7/29/1998.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):


DECISION ID	134185	Region 8
City Creek (Mountain Reach)

Pollutant:	Hardness as CaCO3
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

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

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	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 134185, Hardness as CaCO3	Region 8
City Creek (Mountain Reach)

LOE ID:

239923

Pollutant:

Hardness as CaCO3

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, 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:

Site-Specific Objective: The concentration of Hardness shall not exceed 115 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (801RB8167)

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 134185, Hardness as CaCO3	Region 8
City Creek (Mountain Reach)

LOE ID:

239924

Pollutant:

Hardness as CaCO3

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, 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:

Site-Specific Objective: The concentration of Hardness shall not exceed 115 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (801RB8167)

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 134185, Hardness as CaCO3	Region 8
City Creek (Mountain Reach)

LOE ID:

239922

Pollutant:

Hardness as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Groundwater Recharge

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

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:

Site-Specific Objective: The concentration of Hardness shall not exceed 115 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (801RB8167)

Temporal Representation:

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

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):

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


DECISION ID	132393	Region 8
City Creek (Mountain Reach)

Pollutant:	Iron
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. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. 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.

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 132393, Iron	Region 8
City Creek (Mountain Reach)

LOE ID:

234843

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 17 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

USEPA National Ambient Water Quality Criteria Toxicity for iron 4-day average: 1,000 ug/l.

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 17 samples were taken on 2/17/94, 3/17/94, 11/10/94, 1/23/95, 3/10/95, 12/12/95, 1/31/96, 2/19/96, 3/4/96, 3/13/96, 10/30/96, 11/21/96, 12/9/96, 11/26/97, 1/9/98, 2/3/98 and 3/25/98.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132393, Iron	Region 8
City Creek (Mountain Reach)

LOE ID:

234840

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 6 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

USEPA National Ambient Water Quality Criteria Toxicity: Iron 4-day average 1,000 ug/l

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 6 samples were taken on 11/1/1994, 6/6/1995, 8/14/1995, 7/30/1996, 8/20/1997, 7/29/1998.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):


DECISION ID	132394	Region 8
City Creek (Mountain Reach)

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 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 23 water samples exceed the WILD Lead criterion. 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 23 water samples exceed the WILD Lead criterion 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 132394, Lead	Region 8
City Creek (Mountain Reach)

LOE ID:

234848

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 17 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

California Toxics Rule Aquatic Life for lead: 2/17/94: 71.4 ug/l, 3/19/94: 77.51 ug/l, 11/10/94: 98.62 ug/l, 1/23/95: 55.65 ug/l, 3/10/95 39.92 ug/l, 12/12/95: 78.54 ug/l, 1/31/96: 71.40 ug/l, 2/19/96 ug/l: 47.18 ug/l, 3/4/96: 63.42 ug/l, 3/13/96: 63.42 ug/l, 10/30/96: 114.02 ug/l, 11/21/96 102.97 ug/l, 12/9/96:92.18 ug/l, 11/26/97:2,565.04 ug/l, 1/9/98: 102.97 ug/l, 2/3/98: 92.18 ug/l, 3/25/98: 54.69 ug/l.

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 17 samples were taken on 2/17/94, 3/17/94, 11/10/94, 1/23/95, 3/10/95, 12/12/95, 1/31/96, 2/19/96, 3/4/96, 3/13/96, 10/30/96, 11/21/96, 12/9/96, 11/26/97, 1/9/98, 2/3/98 and 3/25/98.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132394, Lead	Region 8
City Creek (Mountain Reach)

LOE ID:

234844

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 6 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

CTR aquatic life: Lead (hardness dependent metal) is as follows on: 11/1/94: 88.99 ug/l, 6/6/95: 59.51 ug/l, 8/14/95: 71.40 ug/l, 7/30/96: 114.02 ug/l, 8/20/97: 136.80 ug/l, 7/29/98: 62.44 ug/l.

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 6 samples were taken on 11/1/1994, 6/6/1995, 8/14/1995, 7/30/1996, 8/20/1997, 7/29/1998.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):


DECISION ID	150888	Region 8
City Creek (Mountain Reach)

Pollutant:	Nitrogen
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 150888, Nitrogen	Region 8
City Creek (Mountain Reach)

LOE ID:

303308

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

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, 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:

Site-Specific Objective: The concentration of Total Inorganic Nitrogen shall not exceed 1 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (801RB8167)

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 150888, Nitrogen	Region 8
City Creek (Mountain Reach)

LOE ID:

303312

Pollutant:

Total Nitrogen as N

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:

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:

Site-Specific Objective: The concentration of Total Inorganic Nitrogen shall not exceed 1 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (801RB8167)

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 150888, Nitrogen	Region 8
City Creek (Mountain Reach)

LOE ID:

303309

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Groundwater Recharge

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

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:

Site-Specific Objective: The concentration of Total Inorganic Nitrogen shall not exceed 1 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (801RB8167)

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 150888, Nitrogen	Region 8
City Creek (Mountain Reach)

LOE ID:

305546

Pollutant:

Total Nitrogen as N

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:

0 of the 1 samples exceeded the water quality objective for Total Nitrogen at 1 mg/L. This LOE is replacing LOE ID: 234838. It was updated to accurately reflect the split of City Creek into mountain and West Fork reaches with their respective stations.

Data Reference:

Data for Various Pollutants from San Bernardino, 2004.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Table 4-1 of the Santa Ana Basin Plan (1995) states that the water quality objective for Total Nitrogen for City Creek is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from the following stations: 801WE1043

Temporal Representation:

The samples were collected on the date of 2004-06-29

Environmental Conditions:

QAPP Information:

No quality assurance information was provided.

QAPP Information Reference(s):


DECISION ID	134181	Region 8
City Creek (Mountain Reach)

Pollutant:	Oxygen, Dissolved
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 134181, Oxygen, Dissolved	Region 8
City Creek (Mountain Reach)

LOE ID:

236944

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, 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 dissolved oxygen content of surface waters shall not be depressed below 6 mg/L for waters designated COLD 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:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8167 (City Creek Random Olsen Site 167).

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 134181, Oxygen, Dissolved	Region 8
City Creek (Mountain Reach)

LOE ID:

236962

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:

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 dissolved oxygen content of surface waters shall not be depressed below 5 mg/L for waters designated WARM 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:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8167 (City Creek Random Olsen Site 167).

Temporal Representation:

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

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):

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


DECISION ID	132395	Region 8
City Creek (Mountain Reach)

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. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. 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.

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 132395, Selenium	Region 8
City Creek (Mountain Reach)

LOE ID:

234846

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 6 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

NTR aquatic life: Selenium 4-day average 5 ug/l and 1-hour average 20 ug/l

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 6 samples were taken on 11/1/1994, 6/6/1995, 8/14/1995, 7/30/1996, 8/20/1997, 7/29/1998.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132395, Selenium	Region 8
City Creek (Mountain Reach)

LOE ID:

234845

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 17 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

National Toxics Rule Aquatic Life for selenium 4-day average: 5 ug/l and 1-hr average: 20 ug/l.

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 17 samples were taken on 2/17/94, 3/17/94, 11/10/94, 1/23/95, 3/10/95, 12/12/95, 1/31/96, 2/19/96, 3/4/96, 3/13/96, 10/30/96, 11/21/96, 12/9/96, 11/26/97, 1/9/98, 2/3/98 and 3/25/98.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):


DECISION ID	134183	Region 8
City Creek (Mountain Reach)

Pollutant:	Temperature, water
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 134183, Temperature, water	Region 8
City Creek (Mountain Reach)

LOE ID:

238091

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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 temperature of waters designated WARM shall not be raised above 90 degrees F June through October or above 78 degrees F during the rest of the year 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:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8167 (City Creek Random Olsen Site 167).

Temporal Representation:

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

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):

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


DECISION ID	134184	Region 8
City Creek (Mountain Reach)

Pollutant:	Toxicity
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 134184, Toxicity	Region 8
City Creek (Mountain Reach)

LOE ID:

238187

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:

0 of the 1 samples collected by SWAMP RWB8 Monitoring for City Creek (Mountain Reach) 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 and the same location. The following organisms and parameters were utilized for the toxicity tests: Ceriodaphnia dubia for Survival, Ceriodaphnia dubia for Young/female.

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 concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses (Water Quality Control Plan, Santa Ana Basin, Chapter 4 Water Quality Objectives, Inland Surface Waters).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is “Significant; Less Similarity,” which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.

Guideline Reference:

Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013

Spatial Representation:

The samples were collected at monitoring site: 801RB8167 ( City Creek Random Olsen Site 167 ).

Temporal Representation:

The samples were collected between the dates of 2012-07-08 and 2012-07-08.

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):

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

Line of Evidence (LOE) for Decision ID 134184, Toxicity	Region 8
City Creek (Mountain Reach)

LOE ID:

238188

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

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:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at monitoring site: 801RB8167 ( City Creek Random Olsen Site 167 ).

Temporal Representation:

The samples were collected between the dates of 2012-07-08 and 2012-07-08.

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):

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


DECISION ID	132396	Region 8
City Creek (Mountain Reach)

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 section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. 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.

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 132396, Zinc	Region 8
City Creek (Mountain Reach)

LOE ID:

234839

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 6 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

CTR aquatic life: Zinc (hardness dependent metal) is as follows on: 11/1/94: 126.89 ug/l, 6/6/95: 97.07 ug/l, 8/14/95: 109.58 ug/l, 7/30/96: 149.64 ug/l, 8/20/97: 169.93 ug/l, 7/29/98: 100.22 ug/l.

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 6 samples were taken on 11/1/1994, 6/6/1995, 8/14/1995, 7/30/1996, 8/20/1997, 7/29/1998.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132396, Zinc	Region 8
City Creek (Mountain Reach)

LOE ID:

234849

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 17 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

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:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

California Toxics Rule Aquatic Life for zinc: 2/17/94: 109.58 ug/l, 3/19/94: 115.74 ug/l, 11/10/94: 135.87 ug/l, 1/23/95: 92.84 ug/l, 3/10/95: 74.42 ug/l, 12/12/95: 116.76 ug/l, 1/31/96: 109.58 ug/l, 2/19/96: 83.18 ug/l, 3/4/96: 101.27 ug/l, 3/13/96: 101.27 ug/l, 10/30/96: 149.64 ug/l, 11/21/96: 139.83 ug/l, 12/9/96: 129.89 ug/l, 11/26/97: 1,188.55 ug/l, 1/9/98: 139.83 ug/l, 2/3/98: 129.89 ug/l, 3/25/98: 91.77 ug/l.

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 17 samples were taken on 2/17/94, 3/17/94, 11/10/94, 1/23/95, 3/10/95, 12/12/95, 1/31/96, 2/19/96, 3/4/96, 3/13/96, 10/30/96, 11/21/96, 12/9/96, 11/26/97, 1/9/98, 2/3/98 and 3/25/98.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):


DECISION ID	134182	Region 8
City Creek (Mountain Reach)

Pollutant:	pH
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 134182, pH	Region 8
City Creek (Mountain Reach)

LOE ID:

237225

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 SWAMP RWB8 Monitoring data for City Creek (Mountain Reach) 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:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8167 (City Creek Random Olsen Site 167).

Temporal Representation:

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

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):

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


DECISION ID	132170	Region 8
City Creek (Mountain Reach)

Pollutant:	Chloride
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2037
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. As part of this assessment, the site-specific objective for Chloride specified in the Santa Ana Region Basin Plan was applied. Previous-cycle LOEs 234820 and 234823 were retired. The data from those LOEs was reassessed against the site-specific objective. Five lines of evidence are available in the administrative record to assess this pollutant. Eight of the 24 samples exceed the COLD Chloride objective. 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 the 24 samples exceed the COLD Chloride objective, 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 132170, Chloride	Region 8
City Creek (Mountain Reach)

LOE ID:

239982

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Groundwater Recharge

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

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:

Site-Specific Objective: The concentration of Chloride shall not exceed 10 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (801RB8167)

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 132170, Chloride	Region 8
City Creek (Mountain Reach)

LOE ID:

239981

Pollutant:

Chloride

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, 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:

Site-Specific Objective: The concentration of Chloride shall not exceed 10 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (801RB8167)

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 132170, Chloride	Region 8
City Creek (Mountain Reach)

LOE ID:

305534

Pollutant:

Chloride

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 Bernardino County Flood Control District data from storm water program for City Creek (Mountain Reach) to determine beneficial use support and results are as follows: 5 of 17 samples exceeded the water quality standard for Chloride. This LOE is replacing LOE ID: 234823. It was updated to accurately reflect an assessment against the appropriate site-specific objective and BU.

Data Reference:

San Bernardino County Flood Control District data from storm water program

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Site-Specific Objective: The concentration of Chloride shall not exceed 10 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The 17 samples were collected at one station (801WE1043) on City Creek, 2.7 miles north of Highland Ave (north of mile post 32.35) at City Creek Bridge; at 1/4 mile directly south of confluence of West and East Forks of City Creek and 435 feet east of Highway 330.

Temporal Representation:

The 17 samples were collected on 2/17/94, 3/19/94, 11/10/94, 1/23/95, 3/10/95, 12/12/95, 1/31/96, 2/19/96, 3/4/96, 3/13/96, 10/30/96, 11/21/96, 12/9/96, 11/26/97, 1/9/98, 2/3/98, 3/25/98

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132170, Chloride	Region 8
City Creek (Mountain Reach)

LOE ID:

305535

Pollutant:

Chloride

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 Bernardino County Flood Control District data from storm water program for City Creek (Mountain Reach) to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality standard for Chloride. This LOE is replacing LOE ID: 234820. It was updated to accurately reflect an assessment against the appropriate site-specific objective and BU.

Data Reference:

San Bernardino County Flood Control District data from storm water program

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Site-Specific Objective: The concentration of Chloride shall not exceed 10 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The 6 samples were collected at one station (801WE1043) on City Creek, 2.7 miles north of Highland Ave (north of mile post 32.35) at City Creek Bridge; at 1/4 mile directly south of confluence of West and East Forks of City Creek and 435 feet east of Highway 330.

Temporal Representation:

The 6 samples were taken on 11/1/94, 6/6/95, 8/14/95, 7/30/96, 8/20/97, 7/29/98.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132170, Chloride	Region 8
City Creek (Mountain Reach)

LOE ID:

239983

Pollutant:

Chloride

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:

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:

Site-Specific Objective: The concentration of Chloride shall not exceed 10 mg/L in this waterbody (Water Quality Control Plan for the Santa Ana River Basin).

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (801RB8167)

Temporal Representation:

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

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):

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


DECISION ID	132172	Region 8
City Creek (Mountain Reach)

Pollutant:	Cadmium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Original
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 this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 132172, Cadmium	Region 8
City Creek (Mountain Reach)

LOE ID:

234822

Pollutant:

Cadmium

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:

Of the 14 samples none exceeded the CTR criteria because all these were reported as non detect and the detection limit was below the criteria. This data was obtained from the self monitoring reports submitted by San Bernardino County Flood Control District.

Data Reference:

San Bernardino County Flood Control District data from storm water program

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

California Toxics Rule Aquatic Life (this criteria changes day to day because it is hardness dependent): it ranged from 2.3 to 79 ug/l

Guideline Reference:

Spatial Representation:

The samples were collected at one station (station 9) on City Creek, 2.7 miles north of Highland Avenue (north of mile post 32.35) at City Creek Bridge and at 1/4 mile due south of confluence of West and East Forks of City Creek and at 435 feet east of Highway 330.

Temporal Representation:

The samples were taken monthly beginning with 2/17/94 through 4/17/2000.

Environmental Conditions:

The samples were collected as grab samples during the wet weather.

QAPP Information:

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

QAPP Information Reference(s):


DECISION ID	132175	Region 8
City Creek (Mountain Reach)

Pollutant:	Indicator Bacteria
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	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 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 44 samples exceed the E. coli Geomean Objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment ¿pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the 44 samples exceed the E. coli Geomean Objective, and this does not exceed the frequency listed in table 3.2 4. The line of evidence based on the single sample maximum was not included in the Final Use Rating as the Region 8 Basin Plan states that where a representative geometric mean can be calculated, single sample maximum values shall not be used for assessment (page 4-17, footnote 3). 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 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 132175, Indicator Bacteria	Region 8
City Creek (Mountain Reach)

LOE ID:

305542

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

SSM

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

0 of the 57 samples exceeded the E. coli evaluation guideline. This LOE is replacing LOE ID: 234829. It was updated to accurately reflect the split of City Creek into mountain and valley reaches with their respective stations.

Data Reference:

Data for Various Pollutants in Region 8, 2008-2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Santa Ana Region Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The single sample E. coli concentration shall not exceed more than 235/100ml. USEPA Ambient Water Quality Criteria for Bacteria -1986.

Guideline Reference:

Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002

Spatial Representation:

The samples were collected from the following stations: CC1

Temporal Representation:

The samples were collected between the dates of 2008-07-16 and 2009-11-24

Environmental Conditions:

QAPP Information:

Data was collected under the Quality Assurance Project Plan for the Upper Santa Ana River Watershed Water Quality Assessment Project.

QAPP Information Reference(s):

Quality Assurance Project Plan for Upper Santa Ana River Watershed Water Quality Assessment, Version 1.

Line of Evidence (LOE) for Decision ID 132175, Indicator Bacteria	Region 8
City Creek (Mountain Reach)

LOE ID:

305544

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:

Not Specified

Data Used to Assess Water Quality:

0 of the 44 samples exceeded the E. coli evaluation guideline. This LOE is replacing LOE ID: 234831. It was updated to accurately reflect the split of City Creek into mountain and valley reaches with their respective stations.

Data Reference:

Data for Various Pollutants in Region 8, 2008-2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Santa Ana Region Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Geomean: The E. coli concentration for geometric mean shall not exceed more than 126/100ml. USEPA Ambient Water Quality Criteria for Bacteria -1986.

Guideline Reference:

Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002

Spatial Representation:

The samples were collected from the following stations: CC1

Temporal Representation:

The samples were collected between the dates of 2008-07-16 and 2009-11-24

Environmental Conditions:

QAPP Information:

Data was collected under the Quality Assurance Project Plan for the Upper Santa Ana River Watershed Water Quality Assessment Project.

QAPP Information Reference(s):

Quality Assurance Project Plan for Upper Santa Ana River Watershed Water Quality Assessment, Version 1.


DECISION ID	132173	Region 8
City Creek (Mountain Reach)

Pollutant:	Mercury
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	There was no new data considered in the 2024 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 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Of the 48 samples taken, none 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 (0) of 48 samples exceeded the EPA's National Recommended Criteria and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	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 132173, Mercury	Region 8
City Creek (Mountain Reach)

LOE ID:

234827

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 6 samples collected, none exceeded the standards/guidelines.

Data Reference:

San Bernardino County Flood Control District data from storm water program

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan narrative objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

USEPA National Ambient Water Quality Criteria Toxicity: Mercury 1-hr avg. 1.4 ug/l.

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 6 samples were taken on 11/1/1994, 6/6/1995, 8/14/1995, 7/30/1996, 8/20/1997, 7/29/1998.

Environmental Conditions:

the samples were collected as grab samples in the dry weather

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132173, Mercury	Region 8
City Creek (Mountain Reach)

LOE ID:

234826

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 18 samples collected in the water column, none exceeded the standards.

Data Reference:

San Bernardino County Flood Control District data from storm water program

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

U.S. EPA National Ambient Water Quality Criteria Toxicity: Mercury 1-hr avg. 1.4 ug/l

Guideline Reference:

Spatial Representation:

Temporal Representation:

The 18 samples were taken on 2/17/94, 3/17/94, 11/10/94, 1/23/94, 3/10/95, 12/12/95, 1/31/96, 2/19/1986, 3/4/96, 3/13/96, 10/30/96, 11/21/96, 12/9/96, 11/26/97, 1/9/98, 2/3/98, 3/25/98, 1/25/00

Environmental Conditions:

the samples were obtained as grab samples during the wet weather

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132173, Mercury	Region 8
City Creek (Mountain Reach)

LOE ID:

234824

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 24 samples collected, none exceeded the standard listed. This data was obtained from the self monitoring reports submitted by San Bernardino County Flood Control District.

Data Reference:

San Bernardino County Flood Control District data from storm water program

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

U.S. EPA National Ambient Water Quality Criteria Toxicity: Mercury 1-hr avg. 1.4 ug/l.

Guideline Reference:

Compilation of Water Quality Goals

Spatial Representation:

The 18 samples were collected at one station on City Creek 2.7 miles north of Highland Ave. (north of mile post 32.35) at City Creek Bridge; at 1/4 mile directly south of confluence of West and East Forks of City Creek and 435 feet east of Highway 330.

Temporal Representation:

The 18 samples were taken on 2/17/94, 3/17/94, 11/10/94, 1/23/95, 3/10/95, 12/12/95, 1/31/96, 2/19/86, 3/4/96, 3/13/96, 10/30/96, 11/21/96, 12/9/96, 11/26/97, 1/9/98, 2/3/98, 3/25/98, 1/25/00.

Environmental Conditions:

The samples were collected as grab during the wet weather.

QAPP Information:

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

QAPP Information Reference(s):


DECISION ID	132176	Region 8
City Creek (Mountain Reach)

Pollutant:	Nitrogen, Nitrate
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	Original
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 132176, Nitrogen, Nitrate	Region 8
City Creek (Mountain Reach)

LOE ID:

305548

Pollutant:

Nitrogen, Nitrate

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:

0 of the 1 samples do not exceed the water quality objective for Nitrate (as N) at 10 mg/L. The data are reported as non-detects (NDs). These NDs are less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline. This LOE is replacing LOE ID: 234832. It was updated to accurately reflect the split of City Creek into mountain and West Fork reaches with their respective stations.

Data Reference:

Data for Various Pollutants from San Bernardino, 2004.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Santa Ana Region (1995): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The Nitrate (as N) MCL is 10 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from the following stations: 801WE1043

Temporal Representation:

The samples were collected on the date of 2004-06-29

Environmental Conditions:

QAPP Information:

No quality assurance information was provided.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132176, Nitrogen, Nitrate	Region 8
City Creek (Mountain Reach)

LOE ID:

236691

Pollutant:

Nitrogen, Nitrate

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:

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:

Nitrate-nitrogen concentrations shall not exceed 10 mg/L (as N) in inland surface waters designated MUN 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:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8167 (City Creek Random Olsen Site 167).

Temporal Representation:

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

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):

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


DECISION ID	132177	Region 8
City Creek (Mountain Reach)

Pollutant:	Nitrogen, Nitrite
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	Original
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 132177, Nitrogen, Nitrite	Region 8
City Creek (Mountain Reach)

LOE ID:

236955

Pollutant:

Nitrogen, Nitrite

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:

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:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations).

Guideline Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Spatial Representation:

The samples were collected at 1 monitoring site: 801RB8167 (City Creek Random Olsen Site 167).

Temporal Representation:

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

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):

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

Line of Evidence (LOE) for Decision ID 132177, Nitrogen, Nitrite	Region 8
City Creek (Mountain Reach)

LOE ID:

305551

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:

0 of the 1 samples do not exceed the water quality objective for Nitrite (as N) at 1 mg/L. The data are reported as non-detects (NDs). These NDs are less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline. This LOE is replacing LOE ID: 234833. It was updated to accurately reflect the split of City Creek into mountain and West Fork reaches with their respective stations.

Data Reference:

Data for Various Pollutants from San Bernardino, 2004.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from the following stations: 801WE1043

Temporal Representation:

The samples were collected on the date of 2004-06-29

Environmental Conditions:

QAPP Information:

No quality assurance information was provided.

QAPP Information Reference(s):


DECISION ID	132171	Region 8
City Creek (Mountain Reach)

Pollutant:	Silver
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Original
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 132171, Silver	Region 8
City Creek (Mountain Reach)

LOE ID:

234821

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 6 samples collected all were reported as non detect and the detection limit was below the standard and therefore all the samples were counted as none exceeding the standards.

Data Reference:

San Bernardino County Flood Control District data from storm water program

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

CTR Aquatic Life: Silver 11/1/94: 4.56 ug/l, 6/6/95: 2.65 ug/l, 8/14/95: 3.39 ug/l, 7/30/96: 6.37 ug/l, 8/20/97: 8.15 ug/l, 7/29/98: 2.82 ug/l

Guideline Reference:

Spatial Representation:

The 6 samples were collected at one station on City Creek, 2.7 miles north of Highland Ave. (north of mile post 32.35) at City Creek Bridge; at 1/4 mile directly south of confluence of West and East Forks of City Creek and 435 feet east of Highway 330.

Temporal Representation:

The 6 samples were collected on 11/1/94, 6/6/95, 8/14/95, 7/30/96, 8/20/97, 7/29/98.

Environmental Conditions:

The samples were taken as grabs during the dry weather.

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 132171, Silver	Region 8
City Creek (Mountain Reach)

LOE ID:

234825

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 17 samples collected, all were reported as non-detect and only one of these had the detection limit below the standard. So only one sample was counted. This data was obtained from the self monitoring reports submitted by San Bernardino County Flood Control District.

Data Reference:

San Bernardino County Flood Control District data from storm water program

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

California Toxics Rule Aquatic Life ( the criteria changes from day to day because it is dependent on hardness) silver: 2/17/94: 3.39 ug/l, 3/19/94: 3.78 ug/l, 11/10/94: 5.24 ug/l, 1/23/95: 2.42 ug/l, 3/10/95: 1.54 ug/l, 12/12/95: 3.85 ug/l, 1/31/96: 3.39 ug/l, 2/19/96: 1.93 ug/l, 3/4/96:2.86 ug/l, 3/13/96:2.86 ug/l, 10/30/96: 6.37 ug/l, 11/21/96: 5.55 ug/l, 12/9/96: 4.78 ug/l, 11/26/97: 427.84 ug/l, 1/9/98: 5.55 ug/l, 2/3/98: 4.78 ug/l, 3/25/98: 2.36 ug/l

Guideline Reference:

Spatial Representation:

The 17 samples were collected at one station on City Creek 2.7 miles north of Highland Ave. (north of mile post 32.35) at City Creek Bridge; at 1/4 mile directly south of confluence of West and East Forks of City Creek and 435 feet east of Highway 330.

Temporal Representation:

The 17 samples were collected on 2/17/94, 3/17/94, 11/10/94, 1/23/95, 3/10/95, 12/12/95, 1/31/96, 2/19/96, 3/4/96, 3/13/96, 10/30/96, 11/21/96, 12/9/96, 11/26/97, 1/9/98, 2/3/98, 3/25/98.

Environmental Conditions:

The samples were collected as wet weather grabs.

QAPP Information:

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

QAPP Information Reference(s):