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

Supporting Information

Regional Board 2 - San Francisco Bay Region

Water Body Name: Stege Marsh
Water Body ID: CAE2033001120020129144149
Water Body Type: Estuary
 
DECISION ID
88680
Region 2     
Stege Marsh
 
Pollutant: Dieldrin
Final Listing Decision: Do Not Delist from 303(d) list (being addressed with action other than TMDL)
Last Listing Cycle's Final Listing Decision: Do Not Delist from 303(d) list (being addressed with action other than TMDL)(2016)
Revision Status Original
Sources: A Source Unknown
Expected Attainment Date: 2019
Implementation Action Other than TMDL: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted and may be impacted by this pollutant. 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 section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The sediment quality guideline used complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 4. Two of 3 samples exceeded the sediment guideline, 5 of 5 samples exhibit toxicity, and these exceed the allowable frequency listed in Table 3.1 of the Listing Policy. The benthic community in this water body is impacted and this pollutant is associated with this impact. 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: 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 88680, Dieldrin
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88680, Dieldrin
Region 2     
Stege Marsh
 
LOE ID: 403
 
Pollutant: Dieldrin
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 2
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Two of 3 samples exceeded the ERM sediment quality guideline (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

There shall be no chronic toxicity in ambient waters. Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: ERM of 8 ng/g was used (Long et al., 1995).
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88680, Dieldrin
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88680, Dieldrin
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
 
DECISION ID
88836
Region 2     
Stege Marsh
 
Pollutant: PCBs (Polychlorinated biphenyls)
Final Listing Decision: Do Not Delist from 303(d) list (being addressed with action other than TMDL)
Last Listing Cycle's Final Listing Decision: Do Not Delist from 303(d) list (being addressed with action other than TMDL)(2016)
Revision Status Original
Sources: A Source Unknown
Expected Attainment Date: 2019
Implementation Action Other than TMDL: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and the pollutant is likely to cause of contribute to the toxic effect. The benthic community is impacted and may be impacted by this pollutant. The RWQCB has adopted a cleanup order that will result in attainment of the water quality standard. 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 section 303(d) list in the Water Quality Limited Segments Being Addressed category. This conclusion is based on the staff findings that: 1. The sediment quality guideline used complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 4. Two of 3 samples exceeded the sediment guideline, 5 of 5 samples exhibit toxicity, and these exceed the allowable frequency listed in Table 3.1 of the Listing Policy. The benthic community in this water body is impacted and this pollutant is associated with this impact. 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: 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 88836, PCBs (Polychlorinated biphenyls)
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88836, PCBs (Polychlorinated biphenyls)
Region 2     
Stege Marsh
 
LOE ID: 392
 
Pollutant: PCBs (Polychlorinated biphenyls)
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 2
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Two of 3 samples exceeded sediment guideline (Hunt et al., 1998b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Sediment guideline of 400 ng/g for PCBs was used (MacDonald et al., 2000).
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data were synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data were collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88836, PCBs (Polychlorinated biphenyls)
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88836, PCBs (Polychlorinated biphenyls)
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
 
DECISION ID
68082
Region 2     
Stege Marsh
 
Pollutant: Dichlorobenzophenone
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and it cannot be determined if the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted but it is unknown if it is impacted by this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification in favor of 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. A sediment quality guideline is not available that complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the 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 68082, Dichlorobenzophenone
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68082, Dichlorobenzophenone
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68082, Dichlorobenzophenone
Region 2     
Stege Marsh
 
LOE ID: 398
 
Pollutant: Dichlorobenzophenone
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three measurements (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

There shall be no chronic toxicity in ambient waters. Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: No applicable sediment guideline available.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68082, Dichlorobenzophenone
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
 
DECISION ID
88758
Region 2     
Stege Marsh
 
Pollutant: Endosulfan
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and it cannot be determined if the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted but it is unknown if it is impacted by this pollutant. The RWQCB has adopted a cleanup order that will result in attainment of the water quality standard. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments Being Attained category. This conclusion is based on the staff findings that: 1. A sediment quality guideline is not available that complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the 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 88758, Endosulfan
Region 2     
Stege Marsh
 
LOE ID: 400
 
Pollutant: Endosulfan
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three measurements (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

There shall be no chronic toxicity in ambient waters. Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: No applicable sediment guideline available.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88758, Endosulfan
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88758, Endosulfan
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88758, Endosulfan
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
 
DECISION ID
68101
Region 2     
Stege Marsh
 
Pollutant: Endosulfan sulfate
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and it cannot be determined if the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted but it is unknown if it is impacted by this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification in favor of 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. A sediment quality guideline is not available that complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the 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 68101, Endosulfan sulfate
Region 2     
Stege Marsh
 
LOE ID: 399
 
Pollutant: Endosulfan sulfate
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three measurements. Concentration ranges from 0.9 ng/g to 163 ng/g (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

There shall be no chronic toxicity in ambient waters. Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: No applicable sediment guideline available.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68101, Endosulfan sulfate
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68101, Endosulfan sulfate
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68101, Endosulfan sulfate
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
 
DECISION ID
88759
Region 2     
Stege Marsh
 
Pollutant: Heptachlor epoxide
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and it cannot be determined if the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted but it is unknown if it is impacted by this pollutant. The RWQCB has adopted a cleanup order that will result in attainment of the water quality standard. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments Being Attained category. This conclusion is based on the staff findings that: 1. A sediment quality guideline is not available that complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the 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 88759, Heptachlor epoxide
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88759, Heptachlor epoxide
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88759, Heptachlor epoxide
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88759, Heptachlor epoxide
Region 2     
Stege Marsh
 
LOE ID: 397
 
Pollutant: Heptachlor epoxide
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three measurements (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

There shall be no chronic toxicity in ambient waters. Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: No applicable sediment guideline available.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
 
DECISION ID
68704
Region 2     
Stege Marsh
 
Pollutant: Hexachlorocyclohexane (HCH) (mixture)
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity but HCH is not likely to cause or contribute to the toxic effect. It cannot be determined if other HCHs have an impact because there is no applicable guideline. The benthic community is impacted but it is unknown if it is impacted by this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments Being Addressed category. This conclusion is based on the staff findings that: 1. A sediment quality guideline that complies, with the requirements of section 6.1.3 of the Policy is not available. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 4. None of the samples exceeded the sediment guideline for HCH, 5 of 5 samples exhibit toxicity, and these exceed the allowable frequency listed in Table 3.1 of the Listing Policy. The benthic community in this water body is impacted and this pollutant is not associated with this impact. 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: 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 68704, Hexachlorocyclohexane (HCH) (mixture)
Region 2     
Stege Marsh
 
LOE ID: 396
 
Pollutant: Hexachlorocyclohexane (HCH) (mixture)
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: HCH -- three measurements ranging in concentration from 7.5 ng/g to 19.9 ng/g.
alpha HCH -- three measurements ranging in concentration from ND to 292 ng/g. beta HCH -- three measurements ranging in concentration from ND to 56.8 ng/g.
gamma HCH (Lindane) -- 0 of 3 measurements exceeded sediment guideline.
delta HCH -- three measurements ranging in concentration from 0.25 ng/g to 99.4 ng/g (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Sediment guideline for gamma HCH (Lindane) is 0.37 ug/g oc. No applicable sediment guidelines are available for other HCHs.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68704, Hexachlorocyclohexane (HCH) (mixture)
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68704, Hexachlorocyclohexane (HCH) (mixture)
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68704, Hexachlorocyclohexane (HCH) (mixture)
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
 
DECISION ID
68508
Region 2     
Stege Marsh
 
Pollutant: Mirex
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and it cannot be determined if the pollutant is likely to cause or contribute to the toxic effect. It is unknown if the impact is due to the pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list of Water Quality Limited Segments. This conclusion is based on the staff findings that: 1. A sediment quality guideline is not available that complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the 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 68508, Mirex
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68508, Mirex
Region 2     
Stege Marsh
 
LOE ID: 395
 
Pollutant: Mirex
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three measurements range in concentration from ND to 103 ng/g (Hunt et al., 1998b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: No applicable sediment guideline available.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68508, Mirex
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68508, Mirex
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
 
DECISION ID
88760
Region 2     
Stege Marsh
 
Pollutant: Oxadiazon
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and it cannot be determined if the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted but it is unknown if it is impacted by this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification in favor of 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. A sediment quality guideline is not available that complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the 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 88760, Oxadiazon
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88760, Oxadiazon
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88760, Oxadiazon
Region 2     
Stege Marsh
 
LOE ID: 394
 
Pollutant: Oxadiazon
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three measurements range in concentration from ND to 114 ng/g (Hunt et al., 1998b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: No applicable sediment guideline available.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88760, Oxadiazon
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
 
DECISION ID
88837
Region 2     
Stege Marsh
 
Pollutant: Selenium
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and it cannot be determined if the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted but it is unknown if it is impacted by this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification in favor of 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. A sediment quality guideline is not available that complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the 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 88837, Selenium
Region 2     
Stege Marsh
 
LOE ID: 406
 
Pollutant: Selenium
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three measurements. Concentration ranged from 3.8 ug/g to 35.7 ug/g (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

There shall be no chronic toxicity in ambient waters. Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: No sediment guideline available.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88837, Selenium
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88837, Selenium
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88837, Selenium
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
 
DECISION ID
88914
Region 2     
Stege Marsh
 
Pollutant: Toxaphene
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and it cannot be determined if the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted but it is unknown if it is impacted by this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification in favor of 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. A sediment quality guideline is not available that complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the 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 88914, Toxaphene
Region 2     
Stege Marsh
 
LOE ID: 393
 
Pollutant: Toxaphene
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three measurements ranging in concentration from ND ng/g to 15,700 ng/g (Hunt et al., 1998b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: No applicable sediment guideline available.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88914, Toxaphene
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88914, Toxaphene
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88914, Toxaphene
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
 
DECISION ID
88835
Region 2     
Stege Marsh
 
Pollutant: p,p'-DDE
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and it cannot be determined if the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted but it is unknown if it is impacted by this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification in favor of 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. A sediment quality guideline is not available that complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the 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 88835, p,p'-DDE
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88835, p,p'-DDE
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88835, p,p'-DDE
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 88835, p,p'-DDE
Region 2     
Stege Marsh
 
LOE ID: 402
 
Pollutant: p,p'-DDE
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three total DDT samples available. Concentration range from 304 ng/g to 542 ng/g (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: No applicable sediment guideline available.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
 
DECISION ID
80076
Region 2     
Stege Marsh
 
Pollutant: Chlordane
Final Listing Decision: List on 303(d) list (being addressed by action other than TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (being addressed by action other than TMDL)(2016)
Revision Status Original
Sources: A Source Unknown
Expected Attainment Date: 2019
Implementation Action Other than TMDL: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). San Francisco Bay RWQCB Cleanup and Abatement Orders have been rescinded and the Department of Toxic Substances Control is now the lead agency for cleanup and is responsible for oversight of Cleanup Orders.
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted and may be impacted by this pollutant. The RWQCB has adopted a cleanup order that will result in attainment of the water quality standard. 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 section 303(d) list in the Water Quality Limited Segments Being Addressed category. This conclusion is based on the staff findings that: 1. The sediment quality guideline used complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 4. Three of 3 samples exceeded the 6 ng/g ERM sediment quality guideline, 5 of 5 samples exhibit toxicity, and these exceed the allowable frequency listed in Table 3.1 of the Listing Policy. The benthic community in this water body is impacted and this pollutant is associated with this impact. 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: 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 80076, Chlordane
Region 2     
Stege Marsh
 
LOE ID: 404
 
Pollutant: Chlordane
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three of 3 samples exceeded the 6 ng/g ERM sediment quality guideline (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

There shall be no chronic toxicity in ambient waters. Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: ERM of 6 ng/g used (Long and Morgan, 1990).
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80076, Chlordane
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80076, Chlordane
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80076, Chlordane
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
 
DECISION ID
80125
Region 2     
Stege Marsh
 
Pollutant: Copper
Final Listing Decision: List on 303(d) list (being addressed by action other than TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (being addressed by action other than TMDL)(2016)
Revision Status Original
Sources: A Source Unknown
Expected Attainment Date: 2019
Implementation Action Other than TMDL: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted and may be impacted by this pollutant. The RWQCB has adopted a cleanup order that will result in attainment of the water quality standard. 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 section 303(d) list in the Water Quality Limited Segments Being Addressed category. This conclusion is based on the staff findings that: 1. The sediment quality guideline used complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 4. Three of 3 samples exceeded the 270 ìg/g ERM sediment quality guideline, 5 of 5 samples exhibit toxicity, and these exceed the allowable frequency listed in Table 3.1 of the Listing Policy. The benthic community in this water body is impacted and this pollutant is associated with this impact. 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: 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 80125, Copper
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80125, Copper
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80125, Copper
Region 2     
Stege Marsh
 
LOE ID: 408
 
Pollutant: Copper
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Three of 3 samples exceeded 270 μg/g ERM sediment quality guideline (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

There shall be no chronic toxicity in ambient waters. Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: ERM of 270 μg/g was used (Long et al., 1995).
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80125, Copper
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
 
DECISION ID
80127
Region 2     
Stege Marsh
 
Pollutant: Dacthal
Final Listing Decision: List on 303(d) list (being addressed by action other than TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (being addressed by action other than TMDL)(2016)
Revision Status Original
Sources: A Source Unknown
Expected Attainment Date: 2019
Implementation Action Other than TMDL: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and it cannot be determined if the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted but it is unknown if it is impacted by this pollutant. The RWQCB has adopted a cleanup order that will result in attainment of the water quality standard. Based on the readily available information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list. This conclusion is based on the staff findings that: 1. A sediment quality guideline is not available that complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 4. Three of 3 samples exhibited significant urchin toxicity. The water body appears to have toxicity and the pollutant may be contributing to or causing this toxicity. 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: 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 80127, Dacthal
Region 2     
Stege Marsh
 
LOE ID: 401
 
Pollutant: Dacthal
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Five samples ranging in concentration from ND to 11.1 ng/g (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

There shall be no chronic toxicity in ambient waters. Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: No applicable sediment guideline is available.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80127, Dacthal
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80127, Dacthal
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80127, Dacthal
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
 
DECISION ID
80169
Region 2     
Stege Marsh
 
Pollutant: Mercury
Final Listing Decision: List on 303(d) list (being addressed by action other than TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (being addressed by action other than TMDL)(2016)
Revision Status Original
Sources: A Source Unknown
Expected Attainment Date: 2019
Implementation Action Other than TMDL: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted and may be impacted by this pollutant. The RWQCB has adopted a cleanup order that will result in attainment of the water quality standard. 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 section 303(d) list in the Water Quality Limited Segments Being Addressed category. This conclusion is based on the staff findings that: 1. The sediment quality guideline used complies, with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 4. Two of 3 samples exceeded the sediment guideline, 5 of 5 samples exhibit toxicity, and these exceed the allowable frequency listed in Table 3.1 of the Listing Policy. The benthic community in this water body is impacted and this pollutant is associated with this impact. 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: 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 80169, Mercury
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80169, Mercury
Region 2     
Stege Marsh
 
LOE ID: 407
 
Pollutant: Mercury
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 2
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Two of 3 samples exceeded guideline (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

There shall be no chronic toxicity in ambient waters. Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Sediment guideline of 2.1 ug/g was used (PTI Environmental Services, 1991).
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80169, Mercury
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 80169, Mercury
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
 
DECISION ID
68029
Region 2     
Stege Marsh
 
Pollutant: Zinc
Final Listing Decision: List on 303(d) list (being addressed by action other than TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (being addressed by action other than TMDL)(2016)
Revision Status Original
Sources: A Source Unknown
Expected Attainment Date: 2019
Implementation Action Other than TMDL: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for listing under sections 2.2, 3.6, and 3.10 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status while under section 3.10, a minimum of two lines of evidence are needed to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Based on section 3.6 the site has significant sediment toxicity and the pollutant is likely to cause or contribute to the toxic effect. The benthic community is impacted and may be impacted by this pollutant. The RWQCB has adopted a cleanup order that will result in attainment of the water quality standard. 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 section 303(d) list in the Water Quality Limited Segments Being Addressed category. This conclusion is based on the staff findings that: 1. The sediment quality guideline used complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 4. Two of 3 samples exceeded the sediment guideline, 5 of 5 samples exhibit toxicity, and these exceed the allowable frequency listed in Table 3.1 of the Listing Policy. The benthic community in this water body is impacted and this pollutant is associated with this impact. 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: 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 68029, Zinc
Region 2     
Stege Marsh
 
LOE ID: 411
 
Pollutant: Estuarine Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Relative benthic index = 0.00 (2 benthic samples); (Hunt et al., 1998).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: Evaluation of the benthic data was completed using the approaches developed by scientists associated with the BPTCP. The relative benthic index used is a calculated value considering the total fauna, total mollusk species, crustacean species and indicator species at a site. The index ranges from 0 to 1.0. An index value of less than or equal to 0.3 is an indication that pollutants or other factors are negatively impacting the benthic community.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68029, Zinc
Region 2     
Stege Marsh
 
LOE ID: 410
 
Pollutant: Sediment Toxicity
LOE Subgroup: Toxicity
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Toxicity testing of sediments
Data Used to Assess Water Quality: There was 0-1% amphipod survival in 5 of 5 tests. Three of 3 samples with significant urchin toxicity (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: BPTCP reference envelope approach.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was spatially collected.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68029, Zinc
Region 2     
Stege Marsh
 
LOE ID: 409
 
Pollutant: Sediment Toxicity
LOE Subgroup: Narrative Description Data
Matrix: -N/A
Fraction: Not Recorded
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Stege Marsh is identified as a toxic hot spot in the SWRCB Consolidated Toxic Hot Spot Cleanup Plan (SWRCB Resolution No. 99-065). This plan is being implemented by the San Francisco Bay RWQCB through Cleanup and Abatement Orders.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 68029, Zinc
Region 2     
Stege Marsh
 
LOE ID: 405
 
Pollutant: Zinc
LOE Subgroup: Pollutant-Sediment
Matrix: Sediment
Fraction: None
 
Beneficial Use: Wetland Habitat
 
Number of Samples: 3
Number of Exceedances: 2
 
Data and Information Type: Chemical monitoring of sediments
Data Used to Assess Water Quality: Two of 3 samples exceed ERM (Hunt et al., 1988b).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms.

Chronic toxicity is a detrimental biological effect on growth rate, reproduction, fertilization success, larval development, population abundance, community composition, or any other relevant measure of the health of an organism, population, or community.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: ERM of 410 ug/g dw used (Long et al., 1995).
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Data was synoptically collected with benthic community and toxicity measurements.
Temporal Representation: Data was collected from 10/97-12/97.
Environmental Conditions:
QAPP Information: Used BPTCP QA/QC. Data evaluation was based on USEPA guidelines for 305(b) reports, that uses a hierarchy of water quality data levels. Only data of higher overall level of information (Levels 3 and 4) were used to list a water body.
QAPP Information Reference(s):