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itA ALTON <br /> GEOSCIENCE <br /> THE REBULTS TEAM <br /> 8� <br /> June 2, 1992 JUp Jsr <br /> Mr. Clint Rogers <br /> Chevron U. S.A. Products Company <br /> Post Office Box 5004 <br /> San Ramon, California 94583--0804 31-0355 <br /> Subject: Semiannual Ground Water Monitoring Report <br /> Former Chevron Station No. 9-7780 <br /> 3246 East Fremont Street , <br /> Stockton, California <br /> Dear Mr. Rogers: <br /> In accordance with our agreement, Alton Geoscience transmits <br /> this Semiannual Ground Water Monitoring and Sampling Report <br /> for former Chevron Station No. 9-7780, located at 3246 East <br /> Fremont Street, Stockton, California. Figure 1 shows the site <br /> location. <br /> Monitoring and sampling of the ground water monitoring wells <br /> was performed on May, 19, 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, trailer- <br /> mounted, steel tank (California Department of Health Services- <br /> _�_ registered) , and delivered as non-hazardous -to the Chevron - - <br /> Richmond Terminal for treatment. ; <br /> 5870 Stoneridge Drive,Suite 6 <br /> Pleasanton,California 94588 <br /> (510)734-8134•FAX(510)734.8420 <br />