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Quarterly Report - September 1997 <br />' TOP FILLING STATION <br /> 101 South Wilson Way <br /> Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with a request from Mr Ed Endich of Top Filling Station, Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for 101 South Wilson Way, <br /> Stockton, California The location of the site and the Immediately surrounding area are Illustrated <br /> on Figure 1 -Location Map Site structures and monitoring well locations are shown on Figure 2 - <br /> Site Plan <br /> The scope of work was to monitor dissolved petroleum hydrocarbon concentrations in ground water <br /> I and to characterize ground water flow direction and gradient on the site This report is prepared in <br /> accordance with guidelines established by the San Joaquin County Public Health Services - <br /> Environmental Health Division(PHS-EHD)and the Central Valley Regional Water Quality Control <br /> I Board (CVRWQCB) for Investigation of underground storage tank (UST) sites A summary of <br /> previous investigations at the site was included in the Quarterly Report - October 1996, dated 22 <br /> November 1996, prepared by AGE <br /> 2.0. QUARTERLY MONITORING PROCEDURES <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> On 25 September 1997 the depth to ground water in monitoring wells MW-1 through MW-5, VW- <br /> 1C, VW-2A and VW-3A were measured from the top of the well casings to the nearest 0 01 foot <br /> utilizing a Solinst water level meter Ground water elevations from MW-1 through MW-5 were then <br /> calculated by subtracting the measured depth to ground water from the surveyed casing elevations <br /> (Table 1- Relative Ground Water Elevations) Ground water elevations with respect to mean sea <br /> level were plotted and contoured on a scaled site map (Figure 3 - Relative Elevation Ground Water <br /> Map) <br /> After water levels were measured, approximately 9 to 15 gallons of ground water(minimum of three <br /> well volumes) were removed from wells MW-1 through MW-5, VW-1C, VW-2A and VW-3A <br /> utilizing a Grundfos Redi-Flo II submersible pump Temperature, pH and conductivity were <br /> measured at regular intervals from each well using an ICM Model 52200 water analyzer, to monitor <br /> for stabilization of these characteristics during purging Stabilization data and field logs are included <br /> with Appendix A Purged ground water was containerized in 55-gallon drums and stored on-site in <br /> an area lacking general public access <br /> Advanced CeoEnvironmental,Inc <br /> i <br />