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4 <br /> I f< y <br /> 1 � ' ' ' ,• 1 1 ( y 1 F Quarterly Repojrt - First Quarter 2005 <br /> Former STEFANOS GAS STATION <br /> 1419 East Charter Way, Stockton, California , <br />' 1.0. INTRODUCTION sF <br /> i <br /> At the request of Mrs, Winfred f Alexander, executor ofMary Gardella Trust, Advanced h <br />' GeoEnviromnental, Inc (AGE) has prepared this quarterly report for the property located at 1419 <br /> East Charter Way, Stockton, California (site) The objective of the work was to monitor dissolved <br /> ` petroleum hydrocarbon concentrations in ground water and to characterize ground water elevation, <br />' flow direction and hydraulic gradient on-site The site and the surrounding area are illustrated on <br /> Figure 1 On-site structures and monitoring well locations are illustrated on Figure 2 ' Site <br />' background information can be found in the AGE-prepared Well Installation and Soil Vapor <br /> Extraction Pilot Test Report, dated 30 August 2004 <br /> i <br /> , 2.0. PROCEDURES ' <br />' Field procedures were performed in accordance with Central Valley Regional Water Quality Control <br /> Board(CVRWQCB)and San Joaquin County Environmental Health Department(EHD)guidelines <br /> for investigating underground storage tank(UST)sites and sampling groundwater monitoring wells ' <br /> lie <br /> 21 WELL MONITORING AND EVACUATION <br /> On 07 February 2005, ground water monitoring and sampling was performed on monitoring wells <br /> MW-1 through MW-7 Prior to sampling,the depth to ground water was measured from the top of <br />' each well casing to the nearest 0 01-foot utilizing a Solinst water level meter The ground water <br /> w elevation in each well was calculated by subtracting the measured depth to ground water from the <br /> surveyed casing elevation(Table 1) ' ' <br /> tA fter water levels were measured each In onitoring well was purged of st anding. water utilizing a <br /> new, disposable plastic bailer Approximately 2 25 to 3 5 gallons of water (a minimum of three <br />' casing-water volumes) were removed from each well Ground water temperature, pH, and <br /> conductivity were measured at regular intervals during purging using an Oakton water analyzer <br /> Field sheets and data are included in Appendix A Purged water was stored on-site in appropriately <br /> labeled, 55-gallon Department of Transportation (DOT)-approved drums pending proper disposal <br />' 22 COLLECTION OF GROUND WATER SAMPLES <br />' Water samples were collected from the purged wells using new, disposable plastic bailers after <br /> . allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> sample was transferred into four 40-milliliter(ml)volatile organic analysis(VOA)vials containing <br /> Advanced GeoEnv►ronmental,Inc <br /> 1 a <br /> I J <br />