Final California 2010 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 9 - San Diego Region

Water Body Name:	San Diego Bay Shoreline, near Switzer Creek
Water Body ID:	CAB9082100019990210093822
Water Body Type:	Bay & Harbor


DECISION ID	7521	Region 9
San Diego Bay Shoreline, near Switzer Creek

Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Final Listing Decision:	Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2006)
Revision Status	Revised
Reason for Delisting:	Flaws in original listing
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.11 of the Listing Policy. Three lines of evidence are available in the administrative record to assess this pollutant. One of samples exceeded the water quality objective for lindane. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing this water segment-pollutant combination from the section 303(d) list. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of the 18 samples exceeded the lindane water quality objective. The one sample that exceeded the Lindane objective was recorded at 8.2 ug/kg. This value should be treated as an outlier since all other Lindane samples collected in San Diego Bay for the same program had values less than 1.0 ug/kg or were recorded as non-detects. Subsequent sediment sampling that occurred in 2003 and 2004 at the mouth of Switzer Creek all had lindane sediment chemistry values recorded as non-detects. Toxicity identification evaluations conducted in 2004 at the mouth of Switzer Creek indicate that Chlordane is the most likely pesticide that contributes to the sediment toxicity in that area. Chlordane values exceeded the sediment quality guidelines and 95% upper prediction limits seven out of the eight samples collected in 2004. All other pesticides, including lindane, were recorded as non detects in all samples collected in July 2003, March 2004, August 2004 and October 2004.

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

State Board Review of Regional Board Conclusion and Recommendation:

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

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 7521, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 9
San Diego Bay Shoreline, near Switzer Creek

LOE ID:

29909

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Marine Habitat

Aquatic Life Use:

Estuarine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Chemical monitoring of sediments

Data Used to Assess Water Quality:

Six sediment samples were analyzed and all were recorded as non-detects at a detection limit of 1.0 ng/g dry weight. The samples were collected in February and July 2003 as part of a San Diego Bay study on three TMDL locations.

Data Reference:

Sediment Quality Assessment Study at the B Street/Broadway Piers, Downtown Anchorage, and Switzer Creek, San Diego Bay

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

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

Evaluation Guideline:

For lindane the sediment objective is 0.37 ug/g.

Guideline Reference:

An evaluation of methods for calculating mean sediment quality guideline quotients as indicators of contamination and acute toxicity to amphipods by chemical mixtures. Environmental Toxicology and Chemistry. 20(10): 2276-2286

Spatial Representation:

Six sediment samples were collected near the mouth of Switzer Creek in San Diego Bay.

Temporal Representation:

Samples were collected in February and July 2003.

Environmental Conditions:

Samples were collected from the top 5 centimeters of sediment surface layer.

QAPP Information:

Samples were collected in following the guidelines used for Bight 1998 Regional Monitoring surveys.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 7521, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 9
San Diego Bay Shoreline, near Switzer Creek

LOE ID:

29916

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Marine Habitat

Aquatic Life Use:

Estuarine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Chemical monitoring of sediments

Data Used to Assess Water Quality:

Nine sediment samples were analyzed and all were recorded as non-detects at a detection limit of 1.0 ng/g dry weight. The three samples were collected in February, August and October 2004 as part of a San Diego Bay study on three TMDL locations.

Data Reference:

TMDL Sediment Quality Assessment Study at the B Street/Broadway Piers, Downtown Anchorage, and Switzer Creek, San Diego PHASE II

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

For lindane the sediment objective is 0.37 ug/g.

Guideline Reference:

Spatial Representation:

Nine sediment samples were collected near the mouth of Switzer Creek in San Diego Bay.

Temporal Representation:

Samples were collected in February, August and October 2004.

Environmental Conditions:

Samples were collected from the top 5 centimeters of sediment surface layer.

QAPP Information:

Samples were collected in following the guidelines used for Bight 1998 Regional Monitoring surveys.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 7521, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 9
San Diego Bay Shoreline, near Switzer Creek

LOE ID:

29816

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Marine Habitat

Aquatic Life Use:

Estuarine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Chemical monitoring of sediments

Data Used to Assess Water Quality:

Two sediment samples were analyzed and both were recorded as non-detects at a detection limit of 0.2 ng/g dry weight. The samples were collected in 1992 and 1993 for the Bay Protection and Toxic Cleanup Program.

Data Reference:

Status of The Bay Protection and Toxic Cleanup Program Appendices

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

For lindane the sediment objective is 0.37 ug/g.

Guideline Reference:

Spatial Representation:

Two sediment samples were collected near the mouth of Switzer Creek in San Diego Bay.

Temporal Representation:

Samples were collected in 1992 and 1993

Environmental Conditions:

QAPP Information:

Samples were collected in compliance with State Water Board requirements.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 7521, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 9
San Diego Bay Shoreline, near Switzer Creek

LOE ID:

30105

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Marine Habitat

Aquatic Life Use:

Estuarine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Chemical monitoring of sediments

Data Used to Assess Water Quality:

Two sediment samples were analyzed and both were recorded as non-detects at a detection limit of 0.2 ng/g dry weight. The samples were collected in 1992 and 1994 for the Bay Protection and Toxic Cleanup Program.

Data Reference:

Chemistry Toxicity and Benthic Community Conditions In Sediments of The San Diego Bay Region Final Addendum Report

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

For lindane the sediment objective is 0.37 ug/g.

Guideline Reference:

Spatial Representation:

Two sediment samples were collected near the mouth of Switzer Creek in San Diego Bay.

Temporal Representation:

Samples were collected in 1992 and 1994

Environmental Conditions:

QAPP Information:

Samples were collected in compliance with State Water Board requirements.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 7521, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 9
San Diego Bay Shoreline, near Switzer Creek

LOE ID:

4710

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

Unspecified

Guideline Reference:

Placeholder reference pre-2006 303(d)

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	7475	Region 9
San Diego Bay Shoreline, near Switzer Creek

Pollutant:	Chlordane
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2006)
Revision Status	Original
Sources:	Unknown Nonpoint Source \| Unknown Point Source \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.

Regional Board Decision Recommendation:	No new data were assessed for 2008. 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.

USEPA Action (if applicable):	USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant.

Line of Evidence (LOE) for Decision ID 7475, Chlordane	Region 9
San Diego Bay Shoreline, near Switzer Creek

LOE ID:

4709

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Not Recorded

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

Unspecified

Guideline Reference:

Placeholder reference pre-2006 303(d)

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	7522	Region 9
San Diego Bay Shoreline, near Switzer Creek

Pollutant:	PAHs (Polycyclic Aromatic Hydrocarbons)
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2006)
Revision Status	Original
Sources:	Unknown Nonpoint Source \| Unknown Point Source \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.

Regional Board Decision Recommendation:	No new data were assessed for 2008. 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.

USEPA Action (if applicable):	USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant.

Line of Evidence (LOE) for Decision ID 7522, PAHs (Polycyclic Aromatic Hydrocarbons)	Region 9
San Diego Bay Shoreline, near Switzer Creek

LOE ID:

4711

Pollutant:

PAHs (Polycyclic Aromatic Hydrocarbons)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Not Recorded

Beneficial Use:

Marine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

Unspecified

Guideline Reference:

Placeholder reference pre-2006 303(d)

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):