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t • Quarterly Report - Fourth Quarter 2002 PACIFIC PRIDE - SOUTH EL DORADO STREET ' 3147 South El Dorado Street, Stockton, California ' 1.0. INTRODUCTION Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 3147 South El ' Dorado Street(the site),Stockton,Cali fornia The scope ofwork included performance of a quarterly ground water monitoring event and preparation of this report The objectives were to monitor concentrations of petroleum hydrocarbons in ground water and to characterize ground water flow direction and gradient at the site The site setting is illustrated in Figure 1 Site structures and monitoring well locations are depicted in Figure 2 ' This report is prepared in accordance with guidelines issued by the California Regional Water Quality Control Board-Central Valley Region(RWQCB)for investigation of underground storage tank (UST) sites Background information is summarized in the AGE-prepared Preliminary Investigation and Evaluation Report-June 1999, dated 26 July 1999 ' 2 0. PROCEDURES On 02 December 2002, ground water monitoring and sampling were performed at the site on wells MW-1, MW-2, MW-3, MW-5, MW-6 and MW-7 Due to a parked vehicle, AGE could not gain access to well MW-4 As-built monitoring well construction details are summarized in Table 1 Ground water monitoring procedures for the site were outlined in the AGE-prepared Monitoring Well Installation Work Plan - September 1999, dated 01 September 1999, and approved by San Joaquin County Environmental Health Department(SJCEHD) letter dated 23 September 1999 ' 2 1 WELL MONITORING AND PURGING Depth to ground water was measured in each well from the top of the well casing to the nearest 0 01-foot utilizing a Solinst water level meter The ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 2) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) �m After water levels were measured,approximately 4 to 9 gallons of ground water(a minimum of three casing-water volumes per well)were purged from wells MW-1 through MWA�, MW-6 and MW-7 ' utilizing polyethylene disposable bailers, approximately 28 gallons of ground water were purged from well MW-5 utilizing a Watera Hydro-Lift pump Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an Oakton water analyzer Field data and logs are included with Appendix A Purged ground water was containerized . in 55-gallon drums and was stored on-site in an area lacking general public access ' Advanced GeoE nvi ronmental,Inc