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i <br /> - 1 <br /> S <br /> "s` F Quarterly Report - Third Quarter 2005 <br /> x Former STEFANO'S GAS STATION <br /> 1419 East Charter Way, Stockton, California <br /> 1.0. INTRODUCTION <br /> At,the request of Mrs Winifred 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) <br />' The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water elevation, flow direction and hydraulic gradient on-site <br /> Analytical results from the ground water laboratory tests are presented in this report <br /> 1 { <br /> _The site and the surrounding area are illustrated on Figure 1 On-site structures and monitoring well <br /> locations are illustrated on Figure 2 Site background information can be found in the AGE-prepared <br />' Well Installation and Soil Vapor Extraction Pilot Test Report, dated 30 August 2004 '. <br /> 1 , <br /> 2.0. PROCEDURES <br /> Field procedures were performed in accordance with Central Valley Regional Water Quality Control <br /> 10 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 /> Field procedures for ground water sampling are described below <br /> f <br /> 2 1 WELL MONITORING AND EVACUATION <br /> I � <br />' On 02 September 2005,ground water monitoring and sampling was performed on monitoring wells <br /> MW-1,MW-2,MW-3,MW-6,and MW-7 MW-4 and MW-5,located on the Stockton Fairgrounds �I <br /> property across East Charter Way, were not sampled this quarter due to lack of access permission <br /> Prior to sampling, the depth to groundwater was measured,from the top of each well casing to the <br /> nearest 0 01-foot utilizing a Solinst water level meter The ground water elevation in each well was" <br />' calculated by subtracting the measured depth to ground water from the surveyed casing elevation <br /> i <br /> (Table 1) a <br /> After water levels were measured, each monitoring well was purged of standing water utilizing a w <br /> new, disposable plastic bailer Approximately 2 5 to 4 5 gallons of water (a minimum of three „ <br />' casing-water volumes) were removed from each well Ground water temperature, IpH,, and <br /> jconductivity 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 /> IAdvanced GeoEnvironmental,Inc <br /> } <br /> 1 4 = <br />