# Draft 2008 California 303(d)/305(b) Integrated Report

# Supporting Information

## Regional Board 5 - Central Valley Region

Water Body Name: | Clear Lake
Water Body ID: | CAL5135200019980814115549
Water Body Type: | Lake & Reservoir

DECISION ID | 6586
Pollutant: | Nutrients
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: | Agriculture | Erosion/Siltation | Grazing-Related Sources | Urban Runoff/Storm Sewers
TMDL Name: | Clear Lake Nutrient TMDL Project
TMDL Project Code: | 86
Date TMDL Approved by USEPA: | 09/21/2007
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard.. The Clear Lake Nutrient has been approved by the Central Valley Water Board in 2006 and approved by USEPA on 21 September 2007.
RWQCB Board Decision / Staff Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be listed on the section 303(d) list as being addressed by a USEPA approved TMDL
SWRCB Board Decision / Staff Recommendation: | N/A
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 6586

LOE ID: | 721
Pollutant: | Nutrients
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Not Recorded
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 0
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Asses Water Quality: | Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: | Placeholder reference 2006 303(d)
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 | 4285
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 (being addressed by USEPA approved TMDL)(2006)
Revision Status | Original
Sources: | Resource Extraction
TMDL Name: | Clear Lake Mercury TMDL Project
TMDL Project Code: | 76
Date TMDL Approved by USEPA: | 10/20/2003
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This water segment-pollutant combination is listed in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list. The Clear Lake watershed contains the Sulphur Bank mercury mine, a USEPA Superfund site. The Clear Lake Mercury TMDL was approved by the RWQCB in 2002 and subsequently approved by USEPA on 10/20/2003. This TMDL is in the implementation phase. Completion of tasks is dependent on funding from federal and state TMDL programs.
RWQCB Board Decision / Staff Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 4285

LOE ID: | 720
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 Asses Water Quality: | Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: | Placeholder reference 2006 303(d)
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):