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IQuarterly Report - Fourth Quarter 2000 <br /> TOP FILLING STATION <br />' 101 South Wilson Way, Stockton, California <br />' 10. INTRODUCTION AND SCOPE OF WORK <br />' Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the fourth quarter <br /> 2000 for 101 South Wilson Way, Stockton, California The site setting is illustrated on Figure 1 Site <br /> structures and 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 is prepared <br />' in accordance with guidelines established by the California Regional Water Quality Control Board - <br /> Central Valley Region (RWQCB) for investigation of underground storage tank (UST) sites A <br /> summary of previous investigations at the site was included in the Corrective Action Plan-March <br />' 1996, dated 20 March 1996, prepared by AGE <br /> 2.0. QUARTERLY GROUNDWATER MONITORING AND SAMPLING PROCEDURES <br /> . On 27 October 2000, ground water monitoring and sampling was performed at the site on wells <br /> I MW-1, MW-2, MW-3, MW-4, MW-5, VW-1C, VW-1B, VW-2A and VW-3A Ground water <br /> monitoring procedures for the site were outlined in Work Plan Addendum, dated 08 November 1995 <br /> and approved by the San Joaquin County Public Health Services - Environmental Health Division <br /> (PHS-EHD) by letter dated 27 November 1995 <br />' 21 MONITORING WELL PURGE PROCEDURES <br /> Depths to ground water were measured in each well from the tops of the well casings to the nearest <br /> 0 01-foot utilizing a Solmst water Ievel meter Ground water elevations in each well at the site were <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 15 to 19 gallons of ground water(a minimum of <br /> I three casing-water volumes per well)were removed from each well utilizing a two-stage submersible <br /> pump or by hand-bailing with a disposable bailer Temperature,pH and conductivity were measured <br /> for stabilization at regular purge-volume intervals from each well using an ICM water analyzer Field <br /> data and logs are in Appendix A Purged ground water was containerized in 55-gallon drums and <br /> was stored on-site in an area lacking general public access <br /> I <br /> • <br /> Advanced CeoEnvironmental,jnc <br />