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5 <br /> ALT©N <br /> G_sEOSCIENCE <br /> THE RESULTS TEAM <br /> August 30, 1991 I <br /> Mr. Clint Rogers <br /> Chevron U.S.A. , Inc. <br /> post office Box 5004 310-308 <br /> San Ramon, California 94583-0804 <br /> Subject: Quarterly Ground Water Monitoring Report <br /> Chevron Station No. 9-4275 <br /> 2905 West Benjamin holt Drive <br /> Stockton, California i <br /> Dear Mr. Rogers. <br /> In accordance with our agreement, Alton Geoscience transmits this <br /> Quarterly Ground Water Monitoring and Sampling Report for <br /> Chevron Station No. 9-4275, located at 2905 West Benjamin Holt <br /> Drive, Stockton, California. Figure 1 shows the site location. <br /> Monitoring and sampling of the ground water monitoring wells was <br /> performed on July 18, 1991, in accordance with the requirements <br /> and procedures of the California Regional Water Quality Control <br /> Board (RWQCB) and local regulatory agencies. <br /> 3 <br /> FIELD PROCEDURES t <br /> Prior to purging and sampling the wells, the depth to ground <br /> water in each well was measured from the tcp of casing to the <br /> nearest 0.01 foot using an electronic interface probe. Ground <br /> water samples were also collected at this time and chocked for <br /> the presence of liquid-phase hydrocarbons or si�een. <br /> Ground water analytical samples were collected after more than <br /> 3 casing volumes of ground water were purged from each well. <br /> Each sample was collected using a clean bailer (dedicated for <br /> each well) , and then transferred to the appropriate clean s,,mple <br /> containers for delivery to a California-certified laboratory <br /> following proper preservation and chain of custody procedures. <br /> Purged ground water was stored in a 600-gallon, trailer-mounted, <br /> steel tank (California Department of Health Services-registered) <br /> manifested, and hauled to a proper facility for disposal. <br /> W. Burnell Avenue,Sude f40 <br /> CUKDrd,Caldorma 94520 <br /> (415)682.1582•FAX(4151 U2 8921 <br />