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STATE OF CALIFORNIA—ENVIRONMENTAL PROTE161 AGENCY PETE WILSON Govern r <br /> DEPARTMENT OF TOXIC SUBSTANCES CONTROL <br /> 10151 CROYDON WAY,SUITE 3 <br /> SACRAMENTO,CA 95827-2108 <br /> (916) 855-7700 <br /> November 26, 1991 <br /> Mr. Marshall Cloud <br /> Defense Distribution Region West, <br /> Tracy Site <br /> Office of Environmental Protection <br /> 25600 South Chrisman Road <br /> Tracy, California 95376-5000 <br /> Dear Mr. Cloud: <br /> RECOMMENDATIONS REGARDING GROUND WATER CONTAMINATION AT OFF-SITE <br /> RESIDENCES NEAR DEFENSE DISTRIBUTION REGION WEST (DDRW) , TRACY <br /> On November 6 and 14, 1991 the Department of Toxic <br /> Substances Control (Department) , in conjunction with the <br /> California Regional Water Quality Control Board, sampled the <br /> domestic water supplies down gradient of the ground water plume <br /> attributed to DDRW Tracy. The residences sampled were: <br /> Mr. Joe Rose Mr. Glenn Robertson <br /> 25516 S. Banta Rd. 25080 S. Banta Rd. <br /> Tracy, CA 95376 Tracy, CA 95376 <br /> The sampling on November 6 was conducted to assess whether <br /> DDRW Tracy' s ground water plume had impacted either residence. <br /> The detection of carbon tetrachloride at both households and <br /> trichloroethene (TCE) at the Rose property necessitated the <br /> confirmation round on November 14 . The sample results from both <br /> rounds indicated that carbon tetrachloride and TCE concentrations <br /> are consistently near or above the maximum contaminant levels <br /> established for chronic exposure. <br /> At the November 14 meeting, DDRW Tracy stated that it would <br /> accept responsibility for the TCE contamination but the carbon <br /> tetrachloride. In follow up discussions, DDRW Tracy established <br /> the following position: first to provide an alternative drinking <br /> water supply for the Rose household, secondly to conduct monthly <br /> sampling at both residences. Alternative drinking water would <br /> not be provided to the Robertson' s, as the carbon tetrachloride <br /> contamination is not attributable to DDRW Tracy. <br /> The Department strongly urges DDRW Tracy to re-consider its <br /> position and provide an alternative water supply to the Robertson <br /> household. Your rationale for not accepting the responsibility <br /> for the carbon tetrachloride contamination is based on partial <br /> evidence. Please note that DDRW Tracy is in the midst of a <br />