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I <br /> 1 <br /> Quarterly Report - First Quarter 2003 <br /> Former CHASE CHEVROLET (Van Buren) Facility <br /> 424 North Van Buren Street, Stockton, California <br /> 1 <br /> 1.0 INTRODUCTION <br /> At the request of the City of Stockton,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> quarterly report summarizing field activities performed during the first quarter of 2003 at 424 North <br /> Van Buren Street(the site),Stockton,California The scope of work included conducting a quarterly <br /> ground water monitoring event and preparation of this report The site setting is illustrated in <br /> Figure 1 Structures and monitoring well locations are illustrated in 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 /> IWater 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 momtonng wells, respectively <br /> 2 1 QUARTERLY WELL MONITORING PROCEDURES <br /> A quarterly ground water monitoring event was performed on 20 and 21 February 2003 The ground <br />' water monitoring was performed in accordance with the revised monitoring schedule established <br /> during a meeting with EHD staff on 25 September 2002 <br /> r2 1 1 Well Monitoring and Purging <br /> A Solinst water level meter was used to measure the depth to ground water in twelve monitoring <br /> wells at the site and in fourteen monitoring wells at the neighboring Madison site relative to the tops <br /> of the 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 5 gallons of water(approximately three <br /> casing-water volumes) were purged from wells MW-3, MW-6, MW-10 and MW-22 using a new <br /> disposable plastic bailer,and approximately 50 gallons ofwater were purged from well MW-9 using <br /> a two-stage submersible purge pump Temperature,pH and conductivity of the purged water were <br /> I <br /> Advanced GeoEnvironmental,Inc <br /> I <br />