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ALTON FEB 7 '92 TX H: <br /> -� GEOSCIENCE <br /> THE RESULTS TEAM <br /> February 7, 1992 <br /> Mr. Clint Rogers <br /> Chevron U.S.A. , Inc. <br /> Post Office Box 5004 <br /> San Ramon, California 94583-0804 31-0329 <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 <br /> this Quarterly Ground Water Monitoring and Sampling Report for <br /> Chevron Station No. 9-6465, 5608 North Pershing Avenue, <br /> Stockton, California. Figure 1 shows the site location. <br /> Monitoring and sampling of the ground water monitoring wells <br /> was performed on January 9, 1992, in accordance with the <br /> requirements and procedures of the California Regional Water <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 was measured in each well <br /> from the top of casing using an electronic interface probe <br /> with 0. 01 foot tolerance. <br /> Ground water samples were collected after more than 3 casing <br /> volumes of ground water was purged from each well. Each <br /> sample was collected using a clean bailer. Ground water <br /> samples were then decanted into 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 transferred to a 600-gallon, <br /> trailer-mounted, steel tank (California Department of Health <br /> Services-registered) , manifested and delivered to <br /> Erickson Inc. , a licensed hauler. The purged ground water was <br /> then transported as non-hazardous to Gibson Oil/ Pilot <br /> Petroleum of Redwood City, California for recycling. <br /> 1000 Burnett Avenue Suite 140 <br /> Concord California 94520 <br /> (415)682 1582•FAX(415)682 8921 <br />