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Quarterly Report - March 1998 • TOP FILLING STATION 101 South Wilson Way Stockton, California I1.0 INTRODUCTION In accordance with a request from Mr Ed Endich of Top Filling Station, Advanced GeoEnvironmental, Inc (AGE)has prepared this Quarterly Report for 101 South Wilson Way(site), I Stockton, California The location of the site and the immediately surrounding area are illustrated on Figure 1 Site structures and monitoring well locations are shown on Figure 2 The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and the Central Valley Regional Water Quality Control Board(CVRWQCB) for investigation of underground storage tank (UST) sites A summary of previous investigations at the site was included in the Quatterly Report- October 1996, dated 22 November 1996, prepared by AGE 2.0 QUARTERLY MONITORING PROCEDURES 21 MONITORING WELL PURGE PROCEDURES On 12 March 1998,the depth to ground water was measured to the nearest 0 01 foot from the tops of the well casings in monitoring wells M w-1 through MW-5, VW-1C, V W-2A and VW-3A utilizing a Solinst water level meter Ground water elevations from MW-1 through MW-5 were calculated by subtracting the measured depth to ground water from the surveyed casing elevations (Table 1) Ground water elevations with respect to mean sea level were plotted and contoured on a scaled site map (Figure 3) After water levels were measured, approximately 8 to 16 gallons of ground water (a minimum of three well volumes per well),A ere removed from wells MW-1 through MW-5, VW-1 C,VW-2A and VW-3A utilizing a Grundfos Redi-Flo Il submersible pump Temperature,pH and conductivity were rmeasured for stabilization at regular intervals from each well using an ICM Model 52200 water analyzer Dissolved oxygen in purged water was measured at each well using a YSI Model 55 Dissolved Oxygen Meter at the conclusion of the purge process Stabilization data and field logs are included with Appendix A,dissolved oxygen field measurements are summarized in Table 2 Purged ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general public access Advanced GeoEnviren mental,Inc