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ALTON <br /> - GEOSCEENCE <br /> THE RESULTS TEAM <br /> January 29 , 1993 <br /> Mr. Brett Hunter <br /> Chevron U.S.A. Products Company <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. Hunter: <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 5, 1993, 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) , and delivered as non-hazardous to the <br /> Chevron Richmond Terminal for treatment. <br /> 5870 Stonendge Drive Suite 6 <br /> Pleasanton California 94588 <br /> (510)734 8134 FAX{510)734 8420 <br />