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ALTON <br /> - C3El3SCIE1VCE <br /> T-M RESULTS TEAM <br /> LH. <br /> March 8, 1991 <br /> Mr. Clint Rogers <br /> Chevron U. S.A. , Inc. <br /> Post office Box 5004 <br /> San Ramon, California 94583-0804 30-329 <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, 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 /> was performed on January 18 and 19, 1991, in accordance with <br /> the requirements and procedures of the California Regional <br /> Water Quality Control Board (RWQCB) and local regulatory <br /> 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. <br /> Ground water samples were also collected at this time and <br /> checked for the presence of liquid-phase hydrocarbons or <br /> 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 in a 600-gallon, trailer-mounted, steel tank <br /> (California Department of Health Services--registered) <br /> manifested, and hauled to a proper facility for disposal. <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 /> 1006 Burnell Avenue Suite 140 <br /> Concord Cablanta 94520 <br /> (415)6821582•FAX(4151682-8W <br />