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- a <br /> OU <br /> i <br /> ALTt3N <br /> rr, GEOSCfE1VCE <br /> 7HE RESULTS 1: qA <br /> ! October 25, 1981 <br /> Mr. Clint Rogers <br /> Chevron U.S.A., Inc. <br /> Post Office Box 5004 <br /> San Ramon, California 94533-0804 <br /> 310-325 <br /> Quarterly�, <br /> �- Ground water Monitorin <br /> Former Chevron Station No. 9-6155 Report <br /> 9474 North Highway 99 <br /> Stockton, California <br /> Dear Mr. Rogers: <br /> In accordance with our agreement, Alton Geoscience transmits <br /> this Quarterly Ground water Monitoring and Saar <br /> Former Chevron Station No. 9-6155, 94.74 North Highgalinyeggxt for <br /> Stockton, California. Figure 1 shows the site location, <br /> w Monitoring and sampling of the ground water monitoring wells <br /> was performed on September 11, 1991, in accord <br /> nia Regional Water <br /> ance with the <br /> requirements and procedures of the Califor <br /> Quality Control Board (RwQCB) and local regulatory agencies. <br /> FIELD PROCEDURES <br /> «- Prior to purging and sampling the wells, each well was checked <br /> for liquid-phase hydrocarbons or sheen. The depth to ground <br /> water and, if present, free product thickness was measured in <br /> each well rpm tIls top of casing using an electronic interface <br /> Probe with 0.01 foot tolerance. <br /> Ground water samples were collected after A,Dre than 3 <br /> volumes of ground water wcasing <br /> as purged from each well. Each <br /> sample was collected using a clean bailer. Ground water <br /> cantainexsles rforhen deliverytto anto the California-certifiedate clean sample <br /> following proper preservation and chain of custodylaboratory <br /> Purged ground water was stored onsite in DOT-approved, <br /> 55-gallon drums until properly disposed of offsite. <br /> 1000 Bemen Avenue.50e 140 <br /> cmwo.cahn,,4 94520 - <br /> (415)582.1562•FAX(415}552.8921 <br />