Final California 2010 Integrated Report (303(d) List/305(b) 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	Region 5
Clear Lake

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

Regional Board Conclusion:	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.

Regional Board Decision 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

State Board Review of Regional Board Conclusion and Recommendation:

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

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 6586, Nutrients	Region 5
Clear Lake

LOE ID:

721

Pollutant:

Nutrients

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

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

Data Reference:

Placeholder reference 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	4285	Region 5
Clear Lake

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

Regional Board Conclusion:	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.

Regional Board Decision 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.

State Board Review of Regional Board Conclusion and Recommendation:

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

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 4285, Mercury	Region 5
Clear Lake