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1 <br /> Quarterly Report - Third Quarter 2003 <br /> Former CHASE CHEVROLET (Van Buren) 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 /> Iquarterly report summarizing field activities performed during the third 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 /> Historical quarterly monitoring data is included in the tables of this report <br /> 2.0. 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 /> I Department (EHD) for investigations of underground storage tank (UST) sites and sampling of <br /> ground water monitoring wells, respectively <br /> 2 1 QUARTERLY WELL MONITORING PROCEDURES <br /> IA quarterly ground water monitoring event was performed on 07 August 2003 The ground water <br /> monitoring was performed in accordance with the revised monitoring schedule established during <br /> a meeting with EHD staff on 25 September 2002 <br /> 2 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 fifteen 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 /> IAfter measurement of depths to water, between 6 and 47 gallons of water (approximately three <br /> casing-water volumes)were purged from wells MW-3, MW-6, MW-9, MW-10 and MW-22 using <br /> a new disposable plastic bailer or Waterra inertial purge pump Temperature, pH and conductivity <br /> . of the purged water were measured at regular intervals during purging using an Oakton water <br /> analyzer All purged water was stored on-site in 55-gallon DOT-approved drums Field data and field <br /> Ilogs are included in Appendix A <br /> Advanced Geo Environmental,Inc <br /> I <br />