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1 <br />' Quarterly Report - Second Quarter 2001 <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 101 South Wfr on <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 gr(&d <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 Work Plan Addendum-July 1999, <br /> dated 08 July 1999, prepared by AGE <br /> 2.0. QUARTERLY GROUNDWATER MONITORING AND SAMPLING PROCEDURES <br /> On 29 May 2001, ground water monitoring and sampling were performed at the site on wells MW-1, <br /> MW-2, MW-3, MW-4, MW-5, VW-113, VW-1C, VW-2A, VW-2B, VW-3A and VW-3B (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 and approved by the San Joaquin County Public Health <br /> Services - Environmental Health Division (PHS-EHD) by letter dated 27 November 1995 <br /> I21 MONITORING WELL PURGE PROCEDURES <br /> I 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 Solmst 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 1 to 21 gallons of ground water (a minimum of <br /> I three casing-water volumes per well) were removed from each well utilizing a submersible pump <br /> or by hand-bailing with a disposable bailer Approximately %Z gallon of ground water was removed <br /> from well VW-313 before being pumped "dry" 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 /> Advanced GeoEnvironmental,Inc <br />