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RE: DDRW-Tracy Letter November 5, 1992 Page 2 At the November 14, 1991, Project Manager's Meeting,DDRW-Tracy expressed willingness to accept responsibility for the TCE contamination of the Rose residence well, but initially refused to provide bottled water to the Robertson residence since carbon tetrachloride had not been Identified in prior DDRW-Tracy on-site Investigations. Subsequent correspondence from both the Department or'roxic Substances Control (DTSC) and the CVRWQCB pointed out that until DDRW-Tracy completes Its sltewide Investigation they cannot be ruled out as the source of the carbon tetrachloride contamination. It was only after urging from the State regulatory agencies,as well as PIIS/EIID, that DDRW-Tracy agreed to provide bottled water to both residences. In their letter of November 22, 1991, the CVRWQCB again requested that DDRW-Tracy perform an off-site well survey and Implement quarterly monitoring of off-site supply wells as soon as possible. A time schedule for development of a long term alternative water supply for Impacted domestic wells was also requested by January 15, 1992. In their letters of November 26 and 27, 1991, the DTSC also recommended that an oft-site well survey be performed,a quarterly monitoring program be developed and that "the results of the well survey and any other pertinent Information" be provided to the Impacted community and regulatory agencies. The PIIS/EIID is the regulatory agency for water well construction in San Jonquin County. It is essential that PiIS/EIID have timely and accurate information on groundwater contamination problems when making decisions regarding approval of well construction permits and requirements for sealing off impacted water bearing zones. Excluding the PIIS/ELID from the information loop severely inhibits our ability to protect public health and the groundwater supply. It is unfortunate that DDRW-Tracy chose not to inform PHS/EIID of the sampling which was performed in April-May 1992, either at the time of the sampling or when we expressed our concern in the letter dated August 26, 1992. The PIIS/ELID again recommends that DDRW-Tracy exercise its obligation to provide information to the community on DDRW-Tracy's Investigation and remediation activities and Identify the impact these activities may have on private water supplies. Our staff and myself would he more than happy to meet with you to discuss our concerns and perhaps prevent future misunderstandings. Please contact my office at 468.3420 If you have any questions or if you wish to schedule a meeting. .iogi Khanna, M.D., M.P.II. Health Officer 77 7 Rona d /Vali oti k.E.iLS. Director, Environmental Health Division cc: Honorable Richard H. Lehman, Congressman Honorable Alan Cranston, U.S. Senator