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a^ <br /> ALTON GEOSCI EMCEs INC. <br /> ,Tanuary 1L, 1991 <br /> toy. Nancy Vukelich <br /> Chevron U.S.A., Inc. <br /> Post Office Box 5004 30-308 <br /> San Ramon, California 94583-0804 <br /> Subject: Quarterly Ground <br /> Water4 monitoring Report <br /> Chevron O. <br /> 75 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, California <br /> Dear Ms. Vukelich: <br /> In accordance with our agreement, Alton Geoscience, Inc. <br /> transmits this Quarterly Ground Water Monitoring and Sampling <br /> Report for Chevron StationiveNo. 9-4275, located at <br /> 2905 west aBenjjamin the sHlt ite lacati Stockton, California. <br /> Monitoring and sampling of the ground water monitoring wells <br /> � were perfoanad on October 19, 1990, in accordance with the <br /> requirements and procedures of the California Regional Water i <br /> tral Valley Region {RLr'QCB) and <br /> Quality Control Board, Cen <br /> local regulatory agencies. <br /> FIELD PROCEDURES ; <br /> Prior to gorging and sampling the we <br /> Plls, the depth to ground 1 <br /> Pester in each well was measured from the top of casing to the <br /> ac <br /> nearest 0,01 ac foot using an electronic sounder. Ground water f <br /> samples �tec•xe collected and observed for the presence of free <br /> product or sheen. <br /> Ground water analytical samples were collected after more <br /> than 3 casing volumes of ground water were purged 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 sar4ple containers for delivery treservation <br /> California-certified laboratory following proper, p <br /> and chain of custody procedures. Purged ground water was <br /> stored on site in AOT-approved, 55-gallon drums until <br /> properly disposed of offsite. ; <br /> t <br /> SAMPLING AND ANALYTICAL RESULTS <br /> The results of the monitoring and laboratory analyses of the <br /> ground water samples for this quarter, as Wellas the results <br /> �4J of previous quarterly monitoring and sampling eventsare <br /> summarized in Table 1. Based on the previous wellhead <br /> 1000 Bumatt Avenue,Suits 140 Concord,CA 44520•(415)6'.-1582•Fax 682-8921 <br /> is <br />