SITE INFORMATION AND CORRESPONDENCE_1992

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PETE WILSON,Governor ENVIRONMENTAL PROTEC AGENCY _;.s�v CALIFORNIA— m ' DEPARTMENT OF TOXIC SUBS TANCES CONTROL SAICPAM NTO,CA 958CFOyDON WAY,27 12E06 January 2, 1992 RECEIVED Haines, P•E• JAN 0 6 1992 Mr. Abel W' ENVIRONMENTAL HEALTH Environmental Protection Office Building S-4 Sharpe Location est PERMIT/SERVICES Defense Distribution Region W Lathrop, California 95331 Dear Mr. Haines: GROUND WATER FEASIBILITY STUDY AND RISK FINALIZATION OF ASSESSMENT On December 2, 1991, the following reports were submitted to De ion West, Sharpe Site (Sharpe) : the Department of Toxic Substances Control (Department) an behalf P of the Defense Distribution Reg Study at Sharpe "Remedial Investigation/Feasibility ort" , Site, Groundwater Feasibility Study , November Environmental Science and Engineering, Inc. , 1991 (hereinafter "Draft Final Ground Water FS) and "Remedial Investigation/Feasibility Study at Sharpe Site, Risk Assessment Report" , Environmental Science and Engineering, Inc. , November 1991 (hereinafter "Draft Final Risk Assessment") . Department Also included was Sharpe' s responses to the comments on the above-referenced reports, reports and the Department comments were generally The Department has reviewed the Draft Fina "Response to Comments" . The Dep concern to the one item remains of reference Page 40, addressed. However, ��oneI)nse to Comments" "cleanup objectives" Department. In the 'cleanup it is indicated that theterms the term Comment 3) " were replaced and "treatment objectivescontext of the Draft Final Ground andt2- 2 .4 .7 and Table 2 .2-4 , Pages 2-15 level" . As used in the reference Section .2 , refers to ground water re me However, 1 ( cleanup goals synonymously. 16) , the term table. Remediation goals and ground water treatmentinterchang which the aquifer those terms are not necessarily based upon Those concentrations are generally goals are the concentrations of contaminants o will be restored• standards or a health based risk assessment. water Table 2 .2-4 appear aPP P the drinking specified in Treatment goals are usually The concentrations m oals. Such standards are for ground water, remediation g e standards. Control Board the e the Regional Water Quality the Non- defined as by the disc ar the Basin Plan, Non- usually on the Porter-Cologne, and the Inland Surface Water Plan. The and are based upon 2-4 may not address these degradation Policy, concentrations specified in Table 2 . regulations/policies.