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- i r <br /> F � n <br /> F ' <br /> I � ! <br /> • Quarterly Report - Fourth Quarter 2003 <br /> Former STEFANOS GAS STATION <br /> I1419-East Charter Way, Stockton, California <br /> I <br /> I1.0. 'INTRODUCTION <br /> At the request of Mrs Winfred Alexander, executor of Mary Gardella Trust, Advanced N',x <br /> IGeoEnvironmental, 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 /> I petroleum hydrocarbon concentrations in ground water and to characterize ground water elevation, <br /> flow direction and hydraulic gradient on the site The site and the surrounding area are illustrated in <br /> Figure 1 On-site structures and monitoring well locations are illustrated on Figure 2 <br /> '2.0. PROCEDURES <br /> Field procedures were performed m accordance with Central Valley Regional Water Quality Control <br /> Board(CVRWQCB)and San Joaquin County Environmental Health Department(EHD)guidelines <br /> Ifor investigating underground storage tank(UST)sites and sampling ground water monitoring wells <br /> It� 2 1 WELL MONITORING AND EVACUATION <br /> t <br /> On 23 December 2003, ground water monitoring and sampling were performed on wells MW-1 <br /> through MW-7 Prior to sampling,the depth to groundwater was measured from the top of each well <br /> casing to the nearest 0 01-foot utilizing a Solinst water level meter The ground water elevation in <br /> each well was calculated by subtracting the measured depth to ground water from the surveyed <br /> casing elevation (Table 1) - <br /> After water levels were measured, each monitoring well was Ipurged of standing water utilizing a <br />' new, disposable bailer Approximately 2 0 to 3 5 gallons of water (a minimum of 3 casing-water <br /> volumes) were removed,from each well Ground water temperature, pH and conductivity were <br />' measured at regular intervals during purging using an Oakton water analyzer Field sheets and data <br /> are included in Appendix A Purged water was stored on-site in labeled, 55-gallon Department of <br /> Transportation (DOT)-approved drums pending proper disposal <br /> r 2 2 ' COLLECTION OF GROUND WATER SAMPLES # "; <br />' Water samples were collected from the purged wells using new disposable plastic bailers after, ' <br /> allovwing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> sample was transferred into three 40-m1 volatile organic analysis(VOA)vials containing 0 5 ml 18% <br /> . hydrochloric acid as a sample preservative , <br />' Advanced GeoEnviron mental,Inc <br /> f ' <br />