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e <br /> , , 1 <br /> , <br /> T <br /> 1 <br /> r S <br /> 1 Quarterly Report - Fourth Quarter 2004 <br /> Former STEFANOS GAS STATION <br />' 1419 East Charter Way, Stockton, California` <br />' 1.0. INTRODUCTION <br /> At the request of Mrs Winfred Alexander, executor of Mary Gardella Trust, Advanced <br />' GeoEnvironmental, 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 <br /> 1 <br /> 2.0. PROCEDURES — <br /> Field <br /> ROCEDURESr -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 ground water monitoring wells <br /> - <br /> 2 1 WELL MONITORING AND EVACUATION <br /> I � <br /> On 18 November 2004,ground water monitoring and sampling were performed on monitoring wells <br /> MW-I 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 /> elevation in each well was calculated by subtracting the measured depth to ground water from the <br />' surveyed casing elevation(Table 1) <br /> After water levels were measured, each monitoring well was purged of standing water utilizing a <br />' new, disposable plastic bailer Approximately 1 5 to 2 75 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 /> M 1 � <br /> r <br /> 1 5 <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES ' <br /> I ' <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 /> 0 5 ml 18%hydrochloric acid solution as a sample preservative After collection, the samples were <br /> properly labeled, placed in a chilled container, and transported under chain of custody to Cal Tech <br /> i <br /> A&aneed GeoEnvironmental,Inc <br /> 1 - <br />