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a <br /> GEORGE DEUKMEJIAN.Gavemar <br /> A OF CALIFORNIA � <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO.CA 95827-3098 <br /> DEC z 1989 <br /> 13 December 1989 ENVIRUAVIU I'.t HEikLTH <br /> PERMIT r sFRVICE' <br /> Nis. Diane-Hinson <br /> Supervising REHS <br /> Environmental Health Division <br /> San Joaquin County Department of Public Health Services <br /> P.O. Bax 2009 <br /> Stockton, CA 95201 <br /> CHEVRON 560$ NORTH PERSQWA�ERiIINVESTIGATION LY MONITORING REPORTS AND <br /> PROPOSED WORK PLAN FOR ADDITIONAL GROUND <br /> We have reviewed the recent <br /> e ebr1989yworkiplanlnpreparedsbyrDamesd&bMoaress <br /> Associates and the 12 September <br /> consultants for this site. <br /> The quarterly ground water monitoring program has shown a significant increase <br /> in hydrocarbon concentrations in some of the monitoring wells. Because many <br /> of the on-site wells are now dry or contain insufficient water for adequate <br /> sampling, Chevron has submitted a proposed wort: plan for additional <br /> investigation to further define the extent of ground water contamination.' <br /> 4 The proposed scope of work will include installation of four additional ground <br /> water monitoring wells, and testing to determine the hydraulic properties of <br /> the aquifer materials. The proposed design and locations for the monitoring <br /> wells appears appropriate for this phase of the investigation. Therefore, we <br /> recommend approval of the proposed work plan. <br /> If you have any questions, please call me at (916) 361-5731. <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br /> Q <br /> 1 <br />