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ALTON GEOSCIENCE, INL <br /> C J4,V # <br /> January 11, 1991 PER����1 <br /> Mr. Clint Rogers <br /> Chevron U.S.A. , Inc. <br /> Post Office Box 5004 <br /> San Ramon, California 94583-0804 30-329 <br /> Sub3ect: 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, Inc . <br /> transmits this Quarterly Ground Water Monitoring and Sampling <br /> Report for Chevron Station No. 9-6465, located at 5608 North <br /> Pershing Avenue, Stockton, California. Figure 1 shows the <br /> site location. <br /> Monitoring and sampling of the ground water monitoring wells <br /> ' were performed on October 22, 1990, in accordance with the <br /> requirements and procedures of the California Regional water <br /> Quality Control Board, Central Valley Region (RWQCB) and <br /> 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 sounder. Ground water <br /> samples were collected and observed for the presence of free <br /> product 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 ground water was <br /> stored onsite in DOT-approved, 55-gallon drums until properly <br /> disposed of offsite. <br /> SAMPLING AND ANALYTICAL 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, are <br /> summarized in Table 1. Based on the previous wellhead <br /> 1000 Bumett Avenue,Suite 140- Concord,CA 94520•(415)682-1582•Fax 682-8921 <br />