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' Quarterly Report - Third Quarter 2001 <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 <br /> I2.0 QUARTERLY GROUND WATER MONITORING AND SAMPLING PROCEDURES <br /> On 14 August 2001, ground water monitoring and sampling were performed at the site on wells <br /> MW-1, MW-2, MW-3, MW-4, MW-5, VW-1B, VW-1C, VW-2A, VW-2B and VW-3A (wells <br /> MW-1 through VW-3) Ground water monitoring procedures for the site were outlined in Work Plan <br /> Addendum, dated 08 November 1995, approved by the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) by letter dated 27 November 1995 <br /> 2 1 WELL MONITORING AND EVACUATION <br /> Depth to ground water was measured In each well from the tops of the well casings to the nearest <br /> 0 01-foot utilizing a Solinst water level indicator Ground water elevation in each well at the site was <br /> calculated by subtracting the measured depth to ground water from the surveyed casing elevations <br /> (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 3 to 21 gallons of ground water (a minimum of <br /> three casing-water volumes per well) were evacuated (purged) from wells MW-1 through VW-3 <br /> utilizing either a submersible pump or a disposable polyethylene bailer Temperature, pH and <br /> conductivity were measured for stabilization at regular purge-volume intervals from each well using <br /> a Hydac water analyzer Field data and logs are in Appendix A Purged ground water was <br /> containerized in 55-gallon drums and was stored on-site in an area lacking general public access <br /> i <br /> Advanced GeoEnvironmental,Inc <br />