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DECISION ID |
6076 |
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| Pollutant: |
Nickel |
| Final Listing Decision: |
Delist from 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: |
List on 303(d) list (TMDL required list)(2006) |
| Revision Status |
Revised |
| Sources: |
Source Unknown |
| Reason for Delisting: |
State determines water quality standard is being met |
| Impairment from Pollutant or Pollution: |
Pollutant |
| |
| Weight of Evidence: |
None of the 96 samples from Suisun Bay exceeded the objective. |
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| RWQCB Board Decision / Staff Recommendation: |
After review of the available data and information, Water Board staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards have not been exceeded. |
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| SWRCB Board Decision / Staff Recommendation: |
N/A |
| |
| USEPA Decision: |
|
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| |
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| LOE ID: |
5195 |
| |
| Pollutant: |
Nickel |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
Dissolved |
| |
| Beneficial Use: |
Estuarine Habitat |
| Aquatic Life Use: |
Estuarine Habitat |
| |
| Number of Samples: |
96 |
| Number of Exceedances: |
0 |
| |
| Data and Information Type: |
Highest quality fixed-station P/C (conventional plus toxicants) |
| Data Used to Assess Water Quality: |
Data are dissolved nickel measurements of grab samples collected through two monitoring programs. The first is the ongoing Regional Monitoring Program (RMP) in San Francisco Bay. The second set of data was from a special discharger-funded study to develop copper and nickel site-specific objectives (SSOs) that began in 2001. These data were taken throughout San Francisco Bay, but the bulk of the data are from the deepwater spine of the Bay. |
| Data Reference: |
Spreadsheet of nickel data for San Franicsco Bay from Regional Monitoring Program and Special copper/nickel study (1993-2005)
|
| |
| Water Quality Objective/Criterion: |
The Regional Water Board Basin Plan contains water quality objectives of 8.2 microgram/Liter as a 4-day average and, 74 microgram/Liter as a 1-hour average. These objectives were approved by USEPA in January 2005 and are contained in the Regional Board Basin Plan in Table 3-3. |
| Objective/Criterion Reference: |
San Francisco Bay Basin (Region 2) Water Quality Control Plan (Basin Plan) |
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| Evaluation Guideline: |
|
| Guideline Reference: |
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| Spatial Representation: |
21 sampling locations for Suisun Bay. |
| Temporal Representation: |
Samples were taken from 1993 to 2005 in all seasons. |
| Environmental Conditions: |
|
| QAPP Information: |
Regional Monitoring Program QA/QC program is documented at http://sfei.org/rmp/rmp_data_index.html. |
| QAPP Information Reference(s): |
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DECISION ID |
6075 |
| |
| Pollutant: |
Mercury |
| Final Listing Decision: |
List on 303(d) list (being addressed by USEPA approved TMDL) |
| Last Listing Cycle's Final Listing Decision: |
List on 303(d) list (TMDL required list)(2006) |
| Revision Status |
Revised |
| Sources: |
Atmospheric Deposition | Industrial Point Sources | Natural Sources | Nonpoint Source | Resource Extraction |
| TMDL Name: |
San Francisco Bay Mercury |
| TMDL Project Code: |
6 |
| Date TMDL Approved by USEPA: |
02/12/2008 |
| Impairment from Pollutant or Pollution: |
Pollutant |
| |
| Weight of Evidence: |
303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.
A Bay-wide Hg TMDL has been developed and approved by USEPA (2/12/2008) and an approved implementation plan is expected to result in attainment of the standard. This provides a 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. |
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| RWQCB Board Decision / Staff Recommendation: |
Water Board staff conclude that the water body should be placed in the Water Quality Limited Segments Being Addressed category of the section 303(d) list because a TMDL has been approved by USEPA and an approved implementation plan is in place. |
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| SWRCB Board Decision / Staff Recommendation: |
N/A |
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| USEPA Decision: |
|
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Lines of Evidence (LOEs) for Decision ID 6075 |
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| LOE ID: |
3703 |
| |
| Pollutant: |
Mercury |
| LOE Subgroup: |
Pollutant-Tissue |
| Matrix: |
Tissue |
| Fraction: |
Not Recorded |
| |
| Beneficial Use: |
Commercial or recreational collection of fish, shellfish, or organisms |
| |
| Number of Samples: |
0 |
| Number of Exceedances: |
0 |
| |
| Data and Information Type: |
Not Specified |
| Data Used to Assess Water Quality: |
Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006. |
| Data Reference: |
Placeholder reference pre-2006 303(d) |
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| Water Quality Objective/Criterion: |
Unspecified |
| Objective/Criterion Reference: |
Placeholder reference pre-2006 303(d) |
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| Evaluation Guideline: |
Unspecified |
| Guideline Reference: |
Placeholder reference pre-2006 303(d) |
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| Spatial Representation: |
Unspecified |
| Temporal Representation: |
Unspecified |
| Environmental Conditions: |
Unspecified |
| QAPP Information: |
Unspecified |
| QAPP Information Reference(s): |