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1 <br /> it GEORGE DEUKMEJIAN,Governor <br /> STATE OF CALIFORNIA <br /> CALIFORNIA REGIONAL WATER. QUALITY CONTROL BOAAO4 <br /> CENTRAL VALLEY REGION `' OCT <br /> 3443 ROUTIER ROAD (� �� � <br /> SACRAMENTO,CA 95827-3098 <br /> h i� <br /> Ms. Diane Hinson E��Vp�VtITISER ICESljH17 October 1989 <br /> Registered Environmental Health Specialist <br /> Environmental Health Division <br /> San Joaquin County Department of Public Health Services <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> —MOORE-PETROLEUM, 5491 "F" STREET, BANTA - -PRELIMINARY;HYDROGEOLOGIC r <br /> ASSESSMENT REPORT <br /> We have reviewed the 8 September 1989 "Preliminary Hydrogeologic <br /> Assessment Report" prepared by Delta Environmental consultants, Inc. , <br /> for this site. Two additional ground water monitoring wells were <br /> installed during this phase of investigation. The report summarizes <br /> information from a past investigation, and includes analytical results <br /> for one complete round of sampling Based on the levels of hydrocarbon <br /> contamination detected, three additional ground water monitoring wells <br /> are proposed. <br /> The proposed well locations appear adequate for investigating water <br /> quality in the vicinity of the underground storage tank area. However, <br /> only the four new wells are proposed to be sampled during this phase of <br /> investigation. We believe that all the new and existing wells should be <br /> included in this investigation. <br /> Prior to implementing the proposed work plan we believe the new and <br /> existing wells should be resampled to confirm the results of the <br /> previous round of sampling. We also request that after purging the <br /> wells the samples be taken with a bailer, rather than by pumping, to <br /> assure that the samples are not being affected by the polyvinylchloride <br /> tubing used in the pump. <br /> If you have any questions, please call me at (916) 361-5731. <br /> �,J�e? <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> .TDP/tdp <br /> I <br />