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I <br /> Quarterly Report - Third Quarter 2002 <br /> Ile <br /> Former CHASE CHEVROLETBuren Van <br /> ( ) Facility <br />' 424 North Van Buren Street, Stockton, California <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 third quarter of 2002 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 /> HistoncaI quarterly monitoring data is included in the tables of this report <br /> 1 <br /> 2.0. PROCEDURES <br /> IField 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 /> ground water monitoring wells, respectively <br /> 2 1 WELL MONITORING AND EVACUATION <br /> On 30 September 2002, a Solinst water level meter was used to measure the depth to ground water <br /> in twelve monitoring wells at the site and in fourteen monitoring wells at the neighboring Madison <br /> site relative to the tops of the well casings The ground water elevations (Table 1) and hydraulic <br /> tgradient (Figure 3) were determined from these data <br /> After measurement of depths to water, between 6 5 and 14 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 of water were purged from well MW-9 using <br /> a two-stage submersible purge pump Temperature, pH and conductivity of the purged water were <br /> measured at regular intervals during purging using an Oakton water analyzer All purged water was <br /> stored on-site in 55-gallon DOT-approved drums Field data and field logs are included in <br /> Appendix A <br /> Advanced Geo Envi ron mental,Inc <br />