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1 <br /> QUARTERLY REPORT <br /> July 1996 <br />' Top Filling Station <br /> 101 South Wilson Way <br />' Stockton, California <br />' 1.0. INTRODUCTION <br /> In accordance with the request of Mr Ed Endich, Advanced GeoEnvironmental, Inc (AGE) has <br /> prepared this Quarterly Report for the property at 101 South Wilson Way, Stockton, California The <br /> report summarizes field work performed at the site during July 1996 The location of the site is <br /> illustrated in Figure 1 - Location Map A layout of the property is depicted in Figure 2 - Site Plan <br /> Site history and findings from previous investigations and monitoring events at the site are detailed <br /> in the Corrective Action Plan (CAP) and prior Quarterly Reports prepared by AGE <br /> This report is prepared in accordance with the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and the Central Valley Regional Watei Quality Control <br /> Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites <br /> I <br /> 20. QUARTERLY MONITORING PROCEDURES <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> On IS July 1996, the depth to ground water in each moriitor_ng well was measured to the nearest 0 01 <br /> foot utilizing a Solist water level meter The relative ground water ele-ations :were calculated by <br /> subtracting the depth to ground water from the relative casing elevations sut-veyed from a temporary <br /> I benchmark (Table I- Relative Ground Water Elevations) Relative ground water elevations were <br /> plotted and contoured on a scaled site map (Figure 3 - Relative Elevation Ground Water map) <br /> IAfter water levels were measured, approximately 10 to 14 gallons of water (minimum of three well <br /> volumes) were removed from wells MW-1 through MW-5 utilizing a Grundfos Redi-Flo I1 <br /> I submersible pump Temperature, pH and conductivity were measured at regular intervals from each <br /> well using an ICM model 52200 water analyzer Stabilization data and field logs are included with <br /> Appendix A Purged ground water was stored in 55-gallon drums and stored on-site in an area <br /> inaccessible to the general public <br /> 2 2 GROUND WATER SAMPLING <br /> The ground water levels in monitoring wells MW-I through MW-5, were allowed to recover for a <br /> minimum of one hour prior to sample collection Water samples were collected utilizing disposable <br /> polyethylene bailers and new nylon rope Sufficient ground water sample was collected from each <br /> well to fill three 40-i-d EPA vials containing hydrochloric acid as a preservative for the samples Care <br />