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• Quarterly Report - Second Quarter 2003 <br /> PACIFIC PRIDE - SOUTH EL DORADO STREET <br /> 3147 South El Dorado Street, Stockton, California <br /> 1 10 INTRODUCTION <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 3147 South El <br /> ' Dorado Street(the site),Stockton,California The scope ofwork included performance of a quarterly <br /> ground water monitoring event and preparation of this report The objectives were to monitor <br /> concentrations of petroleum hydrocarbons in ground water and to characterize ground water flow <br /> direction and gradient at the site The site setting is illustrated in Figure 1 Site structures and <br /> monitoring well locations are depicted in Figure 2 <br /> This report is prepared in accordance with guidelines issued by the California Regional Water <br /> Quality Control Board-Central Valley Region(RWQCB)for investigation of underground storage <br /> tank (UST) sites Background information is summarized in the AGE-prepared Preliminary <br /> Investigation and Evaluation Report-June 1999, dated 26 July 1999 <br /> ' 2.0. PROCEDURES <br /> On 20 June 2003,groundwater monitoring and sampling were performed at the site on wells MW-1 <br /> through MW-7 As-built monitoring well construction details are summarized in Table 1 Ground <br /> water monitoring procedures for the site were outlined in the AGE-prepared Monitoring Well <br /> Installation Work Plan - September 1999, dated 01 September 1999, and approved by the San <br /> Joaquin County Environmental Health Department(SJCEHD)in a letter dated 23 September 1999 <br /> ' 21- <br /> WELL MONITORING AND PURGING <br /> ' Depth to ground water was measured in each well from the top of the well casing to the nearest <br /> 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 /> (Table 2) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured,approximately 4 to 9 gallons of ground water(a minimum of three <br /> casing-water volumes per well)were purged from wells MW-1 through MW-4, MW-6 and MW-7 <br /> utilizing aWatera Hydro-Lift pump and approximately 28 gallons of groundwater were purged from <br /> ' well MW-5 Temperature, pH and conductivity were measured for stabilization at regular purge- <br /> volume intervals from each well using an Oakton water analyzer Field data and logs are included <br /> with Appendix A Purged groundwater was containen zed in 55-gallon drums and was stored on-site <br /> ' in an area lacking general public access <br /> • <br /> ' Advanced GeoEnvtronmental,Inc <br />