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STATE OF CALIFORNIA leGEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION ..� <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 12 October 1989 / <br /> OCT I G 19991 / <br /> ENVIRONMENTAL HEALTH <br /> Ms. Diane Hinson PERMITISERV.ICES. <br /> Registered Environmental Health Specialist <br /> Environmental Health Division <br /> San Joaquin County Department of Public Health Services <br /> P.O. Box 2009 <br /> t.4- ­ _-_--_­ Stockton-CA 95201 <br /> MOORE PETROLEUM, 14800 WEST FRONTAGE ROAD, MANTECA - PRELIMINARY <br /> HYDROGEOLOGIC ASSESSMENT REPORT <br /> We have reviewed the 8 September 1989 "Preliminary Hydrogeologic <br /> Assessment Report" prepared by Delta Environmental consultants, Inc-. , <br /> I 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, four additional ground water monitoring wells i <br /> are proposed. <br /> The proposed well locations appear adequate for this phase of <br /> investigation. However, only the. four new wells are proposed to be. , <br /> sampled during this phase of -investigation. We believe that all the new <br /> and existing wells should be sampled. We also request that after ., <br /> purging the wells the samples be taken with a bailer, rather than by <br /> pumping, to assure that the -samples are not being affected by the <br /> polyvinylchloride tubing used in the pump. _ <br /> If you have any questions, please call me at (916) 361-5731. <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br /> h <br /> i <br />