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M �gm tt �ti <br /> x . <br /> 1t. <br /> e <br /> Sia <br /> e <br /> ALTCI N GEUSCIEtNCE, INC. <br /> September 21, 1990 <br /> Ms. Nancy Vukelich <br /> Chevron U.S.A., Inc. <br /> Paat Office Box 5004 <br /> San Ramon, California 94583-0804 <br /> 30-189 <br /> Subject:j Quarterly Ground Water Monitoring Report <br /> Chevron Station No. 9-4275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, California <br /> Dear Ms. Vukelich: <br /> In accordance with our agreement, Alton Geoscience, Inc. <br /> transmits this Quarterly Ground Water monitoringand Sa <br /> Report for Chevron Station No. 9-4275 3pling <br /> 2905 West Benjamin Holt located Drive, Stockton, California. <br /> Figure 1 shows the site location. <br /> Monitoring and sanpZin9 of the„ground water monitoring wells <br /> were performed on July 30 199G;,%in accordance with the <br /> requirements and procedures of the govern- <br /> Quality Control Board ( CB RWQ ) ocal and lre 9 ulatorona.l Water <br /> FIELD PROCEDURES y agencies. <br /> Prior to purging and sampling the wells <br /> water in each well was measured from the to Gfpcasingth to gtouthe <br /> nearest 0.01 foot using an electronic sounder. Ground water <br /> „.t samples were collected and observed for the presence of ate <br /> product or sheen. <br /> ;} e <br /> Water samples were collected after more than 3 casing volumes <br /> collected using aecZere an bailero(deach well. <br /> Each aample was <br /> then transferred to the appropriate clean Sampleted for containers <br /> for delivery to a state-certified laboratory following }� and <br /> preservation and chain of custody procedures. proper <br /> SAMFLrXG AND ANALYTrCAL RESULTS <br /> The results of the monitoring and laboratory analyses of the <br /> ground water, samples for this quarter, as well as the results <br /> of previous quarterly monitoring and sampling events <br /> summarized in Table 1. Based on the previous wellhead are <br /> �.J <br /> 1000 Lumen Avenue,SuRe 140•COnc fd,CA W20•(415)6E2-1582•Fax 682.8921 <br /> rt <br /> ,7 <br /> 'a <br /> �a <br />