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M . <br /> ALTON <br /> -� GEOSCIENCE <br /> THE RESULTS TEAM <br /> SEP a `91 <br /> September 3, 1991 <br /> Mr. Clint Rogers <br /> Chevron U.S.A. , Inc. <br /> Post Office Box 5004 <br /> San Ramon, California 94583-0804 310-329 <br /> Subject: Quarterly Ground Water Monitoring Report <br /> Chevron Station No. 9-6465 <br /> 5608 North Pershing Avenue <br /> Stockton, California <br /> Dear Mr. Rogers : <br /> In accordance with our agreement, Alton Geoscience transmits this <br /> Quarterly Ground Water Monitoring and Sampling Report for <br /> Chevron Station No. 9-6465, located at 5608 North Pershing <br /> Avenue, Stockton, California. Figure 1 shows the site location. <br /> . Monitoring and sampling of the ground water monitoring wells was <br /> performed on July 21, 1991, in accordance with the requirements <br /> and procedures of the California Regional Water Quality Control <br /> Board (RWQCB) and local regulatory agencies . <br /> FIELD PROCEDURES <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 an electronic interface probe. Ground <br /> water samples were also collected at this time and checked for <br /> the presence of liquid-phase hydrocarbons or sheen. <br /> Ground water analytical samples were collected after more than <br /> 3 casing volumes of ground water were purged from each well. <br /> Each sample was collected using a clean bailer (dedicated for <br /> each well ) , and then transferred to the appropriate clean sample <br /> containers for delivery to a California-certified laboratory <br /> following proper preservation and chain of custody procedures . <br /> Purged ground water was stored in a 600-gallon, trailer-mounted, <br /> steel tank (California Department of Health Services-registered) <br /> manifested, and hauled to a proper facility for disposal. <br /> AD <br /> 1000 Burnett Avenue Susie 140 <br /> Concord California 94520 <br /> (415)682 15132•FAX(415}682 8921 <br />