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1 Quarterly Report - First Quarter 2002 <br /> TOP FILLING STATION <br />' 101 South Wilson Way, Stockton, California <br />' 1.0 INTRODUCTION AND SCOPE OF WORK <br /> Advanced GeoEnvironmental, Inc (AGE)has prepared this quarterly report for 101 South Wilson <br />' Way(the site), Stockton, California The site setting is Illustrated on Figure 1 Site structures and <br /> monitoring well locations are depicted on Figure 2 <br />' The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water flow direction and gradient on the site This report has been <br />' prepared in accordance with guidelines Issued by the California Regional Water Quality Control <br /> Board-Central Valley Region(RWQCB) for investigation of underground storage tank(UST) sites <br /> A summary of previous investigations at the site was included in the Work Plan Addendum -July <br />' 1999, dated 08 July 1999, prepared by AGE Ground water monitoring data acquired to date is <br /> Included in the tables of this report <br />' 2.0. MONITORING AND SAMPLING PROCEDURES <br />' On 06 March 2002, ground water monitoring and sampling were performed at the site on wells <br /> MW-1 through MW-5, MW-6 (A, B, C, D and E), MW-7 (A, B, C, D and E), VW-IB, VW-1C, <br /> VW-2A and VW-3A As-built monitoring well construction details are summarized in Table 1 <br />' Ground water monitoring procedures for the site were outlined in Work Plan Addendum, dated 08 <br /> November 1995 and approved by the San Joaquin County Environmental Health Department(EHD) <br /> by letter dated 27 November 1995 <br /> I <br /> 2 1 WELL MONITORING AND EVACUATION <br /> to <br /> Depth ground water was measure <br /> p gr d in each well from the top of the well casing to the nearest <br /> 0 01-foot utilizing a Solmst water level meter The ground water elevation in each well was <br /> calculated by subtracting the measured depth to ground water from the surveyed casing elevation <br /> (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br />' After water levels were measured, approximately 2 to 20 gallons of ground water (a minimum of <br /> three casing-water volumes per well) were evacuated (purged) from wells MW-1 through MW-5, <br /> VW-IB, VW-1C, VW-2A and VW-3A utilizing either a submersible Grundfos pump or disposable <br /> polyethylene bailers Temperature, pH and conductivity were measured for stabilization at regular <br /> purge-volume intervals from each well using an Oakton water analyzer Field data and logs are <br /> provided in Appendix A Purged ground water was containerized in 55-gallon drums and stored on- <br /> site in an area lacking general public access <br /> Advanced GeoEnvironmental,Inc <br /> I <br />