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Quarterly Report - Fourth Quarter 2002 <br /> Former CHASE CHEVROLET (Van Buren) Facility <br />' 424 North Van Buren Street, Stockton, California <br /> I1.0. INTRODUCTION <br /> At the request of the City of Stockton,Advanced GeoEnvironniental, Inc (AGE) has prepared this <br /> quarterly report summarizing field activities performed during the fourth quarter of2002 at 424 North <br /> Van Buren Street(the site), Stockton,California The scope of work included conducting a quarterly <br /> ground water monitoring event, installation of 17 ozone sparge wells and preparation of this report <br /> The site setting is illustrated in Figure 1 Structures and monitoring well locations are illustrated in <br /> Figure 2 <br /> Background information was summarized in Corrective Action Plan - December 1996, dated 27 <br /> December 1996 and in Quarterly Report - May 1999, dated 30 July 1999, both prepared by AGE <br /> IHistorical quarterly monitoring data is included in the tables of this report <br /> I2.0. PROCEDURES <br /> Field activities were performed in accordance with guidelines issued by the Central Valley Regional <br /> Water Quality Control Board (RWQCB) and by the San Joaquin County Environmental Health <br /> Department (EHD) for investigations of underground storage tank (UST) sites and sampling of <br /> Iground water monitoring wells, respectively <br /> 1 <br /> 2 1 QUARTERLY WELL MONITORING PROCEDURES <br /> On 02 December 2002, a quarterly ground water monitoring event was performed on twelve on-site <br /> monitoring wells, in addition, depth to water was measured in fourteen wells at the neighboring <br /> former Chas Chevrolet - Madison site The ground water monitoring was performed in accordance <br /> with the revised monitoring schedule established during a meeting with EHD staff on 25 September <br /> I2002 <br /> 2 1 1 Well Monitoring and Evacuation <br /> A Solinst water level meter was used to measure the depth to ground water relative to the tops of the <br /> I well casings The ground water elevations (Table 1) and hydraulic gradient (Figure 3) were <br /> determined from these data <br /> After measurement of depths to water, between 6 5 and 13 gallons of water (approximately three <br /> casing-water volumes) were purged from wells MW-3, MW-6, MW-10 and MW-22 using new <br /> disposable plastic bailer, and approximately 50 gallons of water were purged from well MW-9 using <br /> Advanced GeoEnvuonmental,Inc <br />