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-1 P!1.:-'C13 • -s- ` = J.1, . 1 rcc <br /> beneficial uses already exists in the lanouaoe of Subchapter 15 and our <br /> Remon s past efforts to protect aquatic life from he3Vy metals. <br /> Ms. Catherine Kuhlman of the Water Quality Planning Standards Section of the <br /> EPA, Region 9 office has informed me that the application of the 10_6 cancer <br /> risk, level, instead of the TTHI1 MCL, as the goal for the cleanup of chloroform <br /> contaminated ground water appears to be consistent with the federal Clean <br /> Water Act and the recently adopted Safe Drinking Water Acta Mr. Bill <br /> Thurston, head of the Safe Drinking Water Program for EPA, Region 9, also <br /> agrees that the TTHM standard is not appropriate for protection of ambient <br /> water quality and should not form the basis of cleanup decisions. Mr. Thurston <br /> will discuss this issue with the Superfund group before addressing his <br /> comments to me in writing.$ <br /> I U.S. EPA, Office of Water Regulations and Standards, Ambient Water Quality <br /> Criteria for Chloroform (October 1980). <br /> 2 California Department of Health Services, Guidelines for Chemical <br /> Carcinogen Risk Assessments and Their Scientific Rationale (November <br /> 1985). <br /> 3 California Department of Health Services, Carcinogen Identification Policy: <br /> A statement of Science as a Basis of Policy. draft Section 1 (July 1982). <br /> 4 U.S. EPA, Office of Drinking Water, "SNARL for Trichloroethylene', health <br /> effects advisory ( 1982). <br /> S California Department of Health Services, "Action Levels Recommended" <br /> (March 1986). <br /> 6 Federal Register. Vol. 50, No. 219, Rules and Regulations (Wednesday, <br /> November 13, 1985). <br /> 7 Catherine Kuhlman, Water Quality Planning Standards Section, U.S. EPA, <br /> Region 9, San Francisco, personal communication (22 July 1986). <br /> 8 Bill Thurston, head of the Safe Drinking Water Program, U.S. EPA, Region 9, <br /> San Francisco, personal communication (23 July 1986). or <br /> ,Q <br /> �1 <br /> - T <br />