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ALTON <br /> -� GEOSCIENCE <br /> THE RESULTS TEAM <br /> if In far& <br /> ECEI Vt Lj <br /> November 27 , 19 91 JAN 0 6 9992 <br /> ENVIRONMENTAL HEALTH <br /> Mr. Clint Rogers PERMIT/SERVICES <br /> Chevron U.S .A. , Inc. <br /> Post Office Box 5004 <br /> San Ramon, California 94583-0804 310-329 <br /> Sub)ect: 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, located at 5608 North Pershing <br /> Avenue, Stockton, California. Figure 1 shows the site <br /> location. <br /> Monitoring and sampling of the ground water monitoring wells <br /> • were performed on October 17, 1991, 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 in each well was measured <br /> from the top of casing using an electronic interface probe <br /> with 0.01 foot tolerance. <br /> Ground water analytical samples were collected using a clean <br /> bailer after more than 3 casing volumes of ground water were <br /> purged from each well. Ground water samples were then <br /> decanted into the appropriate clean sample containers for <br /> delivery to a California--certified laboratory following proper <br /> preservation and chain of custody procedures . Purged ground <br /> water was stored on site in DOT-approved, 55-gallon drums <br /> pending pick-up by Erickson Inc. , a licensed hauler. The -6 <br /> purge water was transported as non-hazardous to Gibson Oil/ <br /> Pilot Petroleum of Redwood City, California, for recycling. <br /> 1000 Burnett Avenue Suite 140 <br /> Concord California 94520 <br /> (415)6821582•FAX(415)682 8921 <br />