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.00"� - 0 <br /> SECOR I <br /> INTERNATIONAL l� <br /> ® R INCORPORATED <br /> 0 S E C JUL Q72003 <br /> 3017 Kilgore R ENT HEALTH <br /> Rancho Cordo'r RPSER�'ICES <br /> 916-861 0400 TeE <br /> P <br /> 916-861-0430 Fax <br /> July 3, 2003 <br /> Mr Harlan Knoll <br /> San Joaquin County Environmental Health Department .y <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95201-0388 <br /> 1 4K' <br /> RE Transducer Study ' <br /> Former Chevron Service Station 9-8632 <br /> 575 Grant Line Road <br /> Tracy, California „ <br /> SECOR Project No 77CH 98632 01 0170 ry <br /> Dear Mr Knoll <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (Chevron), presents this transducer study for the above-referenced site This letter has <br /> been prepared at the request of Chevron and was not requested by a regulatory agency <br /> The objective of this study was to assess hydrogeologic communication between the shallow <br /> aquifer through which site monitoring wells are screened and the deeper aquifer beneath the <br /> Corcoran Clay in which the City of Tracy's Ball Park Well is screened <br /> SITE DESCRIPTION <br /> The site is a former service station located at 575 Grant Line Road In Tracy, California The site <br /> is currently a used car lot (Imperial Leasing Ltd ) located in a mixed light commercial and <br /> residential area (Figure 1) A summary of previous investigations is presented in Attachment 1 <br /> Transducer Study <br /> On January 15, 2003, SECOR personnel installed MinlTrolle pressure transducers with built-in r� <br /> data-loggers in site monitoring wells MW-5, MW-6A, and MW-66 to electronically monitor water , <br /> levels Fluctuations in shallow groundwater levels in site monitoring wells were compared to 14 <br /> j4 <br /> pumping activity information for the Ball Park well provided by Mr Dan Wengrin of the City of <br /> Tracy Field Procedures are presented in Attachment 2 <br /> Ball Park Well Lithology <br /> Boring logs for the Ball Park well Indicate that several confining layers were encountered at 200 <br /> feet below ground surface (bgs) to 340 feet bgs, 320 feet bgs to 390 feet bgs, and 410 feet bgs to <br /> 480 feet bgs The confining unit located from 410 feet bgs to 480 feet bgs was identified as the <br /> Corcoran Clay on the driller's log <br /> 1Chevron1986321Reports120031Transducer study doc <br />