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�I <br /> i <br /> R <br /> A LTON <br /> GEOSCIENCE ; .m <br /> THE REsuLTU TEAM r. <br /> t March 8, 1991 MAY <br /> - 'Vftf�rMENTAL HEAL7.4 <br /> fRIvIITiSEPVIS <br /> Mr. Clint Rogers <br /> Chevron U.S.A., Inc. <br /> Post Office Box 5004 <br /> San Ramon, California 94583-0804 30-308 <br /> Subject: Quarterly Ground Water Monitoring Report <br /> Chevron Station No. 9-4275 <br /> 2905 West Benjamin Holt Drive <br /> .Stockton, California <br /> Dear Mr. Rogers: <br /> In accordance with our agreement, Alton Geoscience, Inc. <br /> transmits this Quarterly Ground Water Monitoring and Sampling <br /> Report for Chevron Station No. 9-4275, located at <br /> 2905 West Benjamin Holt Drive, Stockton, California. <br /> Figure 1 shows the site location. <br /> Monitoring and sampling of the ground water monitoring wells <br /> was performed on January 17, 1991, in accordance with the <br /> zc. uirements 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, the depth to ground <br /> water in each well was measured from the top cf casing to the <br /> nearest 0.01 foot using an electronic interface probe. <br /> Ground water samples were also collected at this time and <br /> checked for the presence of liquid-phase hydrocarbons or <br /> sheen. <br /> Ground water analytical samples were collected after more <br /> than 3 casing volumes of ground water were Furged from each <br /> well. Each sample was collected using a clean bailer <br /> (dedicated for each well), and then transferred to the <br /> appropriate clean sample containers for delivery to a <br /> California-certified laboratory following proper preservation <br /> and chain of custody procedures. Purged ground water was <br /> stored in a 600-gallon, trailer-mounted, steel tank <br /> (California Department of Health Services-registered) <br /> manifested, and hauled to a proper facility for disposal. <br /> SAMPLING AND ANALYTICAL RESULTS <br /> The results of the monitoring and laboratory analyses of the <br /> ground water samples for this quarter, as well as the results <br /> ��- of previous quarterly monitoring and sampling events, are <br /> summarized in Table 1. Based on the previous wellhead <br /> I=B unen A-e",Suite 110 - - <br /> Concord C4Varrw 91524 <br /> (4151692•tW•FAX(4Z)682 M <br />