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• TON F r,5 - 5- 2' .)uly l'85 beneficial uses already exists in the language of Subchapter 15 ana our Region's past efforts to protect aquatic life from heavy metals. Ms. Catherine Kuhlman of the Water Quality Planning Standards Section of the EPA, Region 9 office has informed me that the application of the 10-6 cancer risk level, instead of the TTHII MCL, as the goal for the cleanup of chloroform contaminated ground water appears to be consistent with the federal Clean Water Act and the recently adopted Safe Drinking Water Acta Mr, Bill Thurston, head of the Safe Drinking Water Program for EPA, Reqion 9, also agrees t'nat the TTHM standard is not appropriate for protection of ambient water Gualii r and should not form the basis of cleanup decisions. Mr. Thurston will discuss this issue with the Superfund group before addressing his. - comments to me in writing.$ U.S. EPA, Office of Water Regulations and Standards, Ambient Water Quality Criteria for Chloroform (October 1980). 2 California Department of Health Services, Guidelines for Chernical Carcinogen Risk Assessments and Their Scientific Rationale (November 1985). 3 California Department of Health Services, Carcinooen Identification Policy: A statement of Science as a Basis of PoliM draft Section I (July 1982). 4 U.S. EPA, Office of Drinkina Water, "SNARL for Trichloroethylene", health effects advisory (1982). 5 California Department of Health Services, "Action Levels Recommended" (March 1986). 6 Federal Register. Vol. 50, No. 219, Rules and Regulations (Wednesday, November 13, 1985). 7 Catherine Kuhlman, Water Quality Planning Standards Section, U.S. EPA, Region 9, San Francisco, personal communication (22 July 1986). 8 Bill Thurston, head of the Safe Drinking Water Program, U.S. EPA, Region 9, San Francisco, personal communication (23 July 1986). oe C-6