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STATE OF CALIFORNIA—ENVIRONMENTAL PROTECTION AGENCY PETE WILSON,Governor <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 April 8 , 1993 <br /> APR 12 1993 <br /> Mr. Robert Doss, P. E. <br /> ENVIRONMENTAL HEALTH <br /> Project Manager PtfiMt#IVyIbtq <br /> Pacific Gas & Electric Company <br /> Environmental Services <br /> 77 Beale Street, Room F-1636 <br /> San Francisco, California 94106 <br /> PACIFIC GAS & ELECTRIC (PG&E) - STOCKTON, REMEDIAL INVESTIGATION <br /> AND RISK ASSESSMENT (RI/RA) REPORT <br /> Dear Mr. Doss: <br /> The Department of Toxic Substances Control (Department) has <br /> completed its review of the Risk Assessment (RA) portion of the <br /> RI/RA report submitted in November 1992 . The Department's <br /> toxicologist has identified several deficiencies with the RA and <br /> has forwarded comments that must be addressed in order to <br /> constitute an acceptable document. <br /> The general deficiency is that several inaccurate <br /> assumptions were made that resulted in the elimination of <br /> potential routes of exposures, potential human receptors, and <br /> chemicals of potential concern from being evaluated in the RA. <br /> For example, the shallow groundwater contamination found in zones <br /> A & B must not be dismissed from the RA evaluation simply by <br /> assuming these zones are not potential domestic water sources. <br /> The State Water Board' s Resolution 88-63, the "Sources of <br /> Drinking Water" policy clearly defines groundwater in your area <br /> as a potential source of municipal and domestic supply. <br /> Additionally, potential exposures to Hazelton Avenue strip and <br /> Area I of the Site must not be eliminated simply by indicating <br /> the areas are currently covered or that deed restrictions have <br /> been assumed. The baseline RA must reflect non-remediated <br /> conditions at the Site. <br /> The baseline RA must provide a basis to determine the <br /> appropriate response action for the Site; to determine residual <br /> chemical levels that are adequately protective of public health; <br /> and to compare potential health impacts of various remedial <br /> alternatives. Enclosed are the Department's specific comments <br /> regarding the deficiencies of the RA. Please address the <br /> PrinlN on NBI;yCIW Pep. <br />