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ALTON <br /> ® Oe <br /> CE <br /> TIOM MMULsS TEAM <br /> June 4, 1991 <br /> Mr. Clint Rogers <br /> Chevron U.S.A. , Inc. <br /> Post Office Box 5004 <br /> San Ramon, California 94583-0804 310-355 <br /> Subject: Quarterly Ground Water Monitoring Report <br /> Chevron Station No. 9-7780 <br /> 3246 East Fremont Street <br /> Stockton, California <br /> i <br /> Dear Mr. Rogers: <br /> r <br /> In accordance with our agreement, Alton Geoscience, Inc. <br /> transmits this Quarterly Ground Water Monitoring and Sampling <br /> Report for Chevron Station No. 9-7780, located at 3246 East <br /> r Fremont Street, Stockton, California. Figure 1 shows the <br /> site location. <br /> Monitaring,ands,sampling ,of the ground„water monitoring.wells <br /> wrepfgc ou1pr�:1 15; 1991, in accordance with the <br /> tuK-..ua ; <br /> requirements and procedures of the California Regional Water <br /> Quality Control Board (RWQCB) and local regul-tory egencies. <br /> I <br /> FIELD PROCEDURES <br /> I <br /> Prior to purging and sampling the wells, the depth to ground <br /> water in each well was measured from the top of casing to the <br /> nearest 0.01 foot using and electric interface probe. Gro+ind <br /> water samples were also collected at this time and checked <br /> for the presence of liquid-phase hydrocarbons or sheen <br /> Ground water analytical samples were collected after more <br /> than 3 casing volumes of ground water were purged from each <br /> well. Each sample was collected using a clean bailer <br /> (dedicated for each well) , and then transferred into the <br /> appropriate clean sample containers for delivery to a <br /> California-certified laboratory following proper preservation <br /> and chain of custody procedures. Purged grdund water was <br /> sto�ec}x orr�ita i n DDT-approved, 55-gal 6i dirk„ p nd`i'ncg proper <br /> SAMPLING AND ANALYTICAL RESULTS <br /> The results of the monitoring and laboratory analyses of the <br /> ground eater samples for this quarter, as well as the results <br /> of previous quarterly monitoring and sampling events, are <br /> summarized in Table 1. <br /> MW Burnm AvemA Sual UO <br /> (415) 8 1582 FAX <br /> 44525 <br /> t415f 6821582•FAx t41518e2-B92t <br /> I <br />