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0 <br /> „TATE OF CALIFORNIA—ENVIRONMENTAL PROTECTION AGENCY PETE WILSON, Governor <br /> I <br /> DEPARTMENT OF TOXIC SUBSTANCES CONTROL <br /> REGION 1 <br /> 10151 CROYDON WAY,SUITE 3 <br /> SACRAMENTO,CA 95827-2106 <br /> (916)855-7700 <br /> (916) 255-3737 <br /> April 26, 1993 <br /> IVMr. Robert Doss, P.E. <br /> Project Manager <br /> Pacific Gas & Electric Company APR 2 8 1993 <br /> Environmental Services ENVIRONMENTAL- HI-.,u,O'H <br /> 77 Beale Street, Room F-1636 <br /> San Francisco, California 94106 PERMS ,,/$ERVICCs <br /> PACIFIC GAS & ELECTRIC COMPANY (PG&E) , STOCKTON - REMEDIAL <br /> INVESTIGATION REPORT <br /> Dear Mr. Doss: <br /> The Department of Toxic Substances Control (Department) has <br /> reviewed PG&E's March 1, 1993 , response to the Department's <br /> comments issued February 3 , 1993, for the Remedial Investigation <br /> Report. The Department's comments have not been adequately <br /> addressed. Apparently PG&E does not concur with the Department <br /> that additional groundwater characterization work will be <br /> required to satisfy the requirements of the June, 1991 Consent <br /> Agreement. <br /> One of the primary goals of the characterization work is to <br /> define the nature and extent of contaminants of concern <br /> sufficiently to evaluate remedial action alternatives, including <br /> alternatives for a permanent remedial solution. To seek a <br /> permanent remedial solution as required by the National <br /> Contingency Plan (NCP) , PG&E must ensure that the nature and <br /> extent of all releases or threatened releases of a hazardous <br /> substance are thoroughly investigated. This objective was <br /> clearly specified and agreed to when entering into the Consent <br /> Agreement in June of 1991. A thorough investigation would <br /> consist of delineating the dispersion of contaminants to <br /> background levels in order to completely define the extent of <br /> contamination. Characterization to background levels would be <br /> required in order to evaluate a cleanup to background alternative <br /> in the Feasibility Study (FS) . <br /> In order to satisfy the requirements listed above, PG&E must <br /> complete characterization of groundwater. This must include soil <br /> modeling to protect groundwater from further degradation by <br /> h <br /> PrinnC on flecyci[O Peper <br />