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

Supporting Information

Regional Board 5 - Central Valley Region

Water Body Name:	East Antioch Creek (in Delta Waterways, western portion)
Water Body ID:	CAR5440000020200310036705
Water Body Type:	River & Stream


DECISION ID	121431	Region 5
East Antioch Creek (in Delta Waterways, western portion)

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

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

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	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 121431, Arsenic	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

186408

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STLS Monitoring WY2017 data for East Antioch Creek (in Delta Waterways, western portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for arsenic incorporated by reference in the Basin Plan is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.

Line of Evidence (LOE) for Decision ID 121431, Arsenic	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

186388

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.


DECISION ID	121432	Region 5
East Antioch Creek (in Delta Waterways, western portion)

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

Regional Board Conclusion:	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 121432, Cadmium	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

186776

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for cadmium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.

Line of Evidence (LOE) for Decision ID 121432, Cadmium	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

186735

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.


DECISION ID	121433	Region 5
East Antioch Creek (in Delta Waterways, western portion)

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:	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 121433, Copper	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

187881

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary Maximum Contaminant Level for copper incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 1.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.

Line of Evidence (LOE) for Decision ID 121433, Copper	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

187656

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.


DECISION ID	121434	Region 5
East Antioch Creek (in Delta Waterways, western portion)

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:	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 121434, Lead	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

190804

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.

Line of Evidence (LOE) for Decision ID 121434, Lead	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

190746

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: At a minimum, water designated for use as MUN shall not contain lead in excess of 0.015 mg/l.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.


DECISION ID	130913	Region 5
East Antioch Creek (in Delta Waterways, western portion)

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

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

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 130913, Mercury	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

190984

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria for the protection of human health from consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.

Line of Evidence (LOE) for Decision ID 130913, Mercury	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

191126

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria for the protection of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.

Line of Evidence (LOE) for Decision ID 130913, Mercury	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

191003

Pollutant:

Mercury

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:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan for the Sacramento and San Joaquin River Basins).

Objective/Criterion Reference:

Evaluation Guideline:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.


DECISION ID	121435	Region 5
East Antioch Creek (in Delta Waterways, western portion)

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:	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 121435, Selenium	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

193576

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.

Line of Evidence (LOE) for Decision ID 121435, Selenium	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

193453

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for selenium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.


DECISION ID	121436	Region 5
East Antioch Creek (in Delta Waterways, western portion)

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:	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 121436, Zinc	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

194369

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary Maximum Contaminant Level for zinc incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 5.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.

Line of Evidence (LOE) for Decision ID 121436, Zinc	Region 5
East Antioch Creek (in Delta Waterways, western portion)

LOE ID:

194394

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Eantioch)

Temporal Representation:

The samples were collected between the dates of 2017-01-08 and 2017-01-08

Environmental Conditions:

QAPP Information:

SFEI: Don Yee, Amy Franz, Adam Wong, John Ross, Philip Trowbridge

QAPP Information Reference(s):

Quality Assurance Program Plan for The Regional Monitoring Program for Water Quality in San Francisco Bay.