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r <br /> i r <br /> � r <br /> ry i <br /> Quarterly Report - First 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 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 /> 4 <br /> 20 PROCEDURES <br /> Field procedures were performed in accordance with Central ValleyRegional 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 /> 21 WELL MONITORING AND EVACUATION <br /> On 03 March 2004,ground water monitoring and sampling were performed on wells MW-1 through <br /> MW-7 Prior to sampling, the depth to ground water was measured from the top of each well casing <br /> to the nearest 0 01-foot utilizing a Solmst water level meter The ground water elevation in each well <br /> was calculated by`s ibtractmg the measured depth to ground water from the surveyed casing elevation <br /> (Table 1) <br /> After water levels were measured, each monitoring well`was purged of standing water utilizing a <br /> new, disposable bailer Approximately 3 0 to 3 75 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 /> ITransportation (DOT)-approved drums pending proper disposal <br /> I22 COLLECTION OF GROUND WATER SAMPLES <br /> + l <br /> Water samples were collected from the purged wells using new disposable plastic bailers after <br /> Iallowing the wells to achieve a minimum 80%recovery of the pre'purge water volume Each water <br /> . sample was transferred into three 40-ml volatile organic analysis(VOA)vials containing 0 5 ml 18% <br /> IAdvanced GeoEnvironmental,Inc <br /> + <br />