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1 - <br />' Quarterly Report - Fourth Quarter 2001 <br /> • PACIFIC CAR WASH <br />' 4405 Pacific Avenue, Stockton, California <br /> 1.0. INTRODUCTION <br /> Advanced GeoEnvironmental, Inc (AGE)has prepared this quarterly report for 4405 Pacific Avenue <br /> (the site), Stockton, California The scope of work included conducting a quarterly ground water <br /> monitoring event and preparation of this report The site setting is illustrated in Figure 1 Site <br />' structures and monitoring well locations are depicted in Figure 2 <br /> This report has been prepared in accordance with guidelines issued by the California Regional Water <br />' Quality Control Board - Central Valley Region for investigation of underground storage tank (UST) <br /> sites A summary of previous investigations at the site was included in the Preliminary Site <br /> Investigation and Evaluation Report-January 1997, dated 15 January 1997, prepared by AGE <br /> 2.0 PROCEDURES <br /> On 31 December 2001, a ground water monitoring and sampling event was performed at the site on <br /> wells MW-1,MW-2,MW-3,MW-4, MW-5,MW-6,MW-7,MW-8,MW-9,MW-IOA and MW-IOB <br /> (MW-1 through MW-1013), monitoring well construction details are summarized in Table i Ground <br /> water monitoring procedures for the site were outlined in the Work Plan Addendum - June 1998, <br /> dated 10 June 1998, prepared by AGE and approved by the San Joaquin County Environmental <br /> Health Department (SJCEHD) by letter dated 24 June 1998 <br />' 2 1 WELL MONITORING AND EVACUATION <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 Solmst water level meter The ground water elevation in each well was calculated <br /> by subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) <br /> Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 5 to 12 gallons of ground water(a mimmum of three <br /> casing-water volumes per well) were evacuated (purged) from wells MW-1 through MW-1013 <br /> utilizing a two-stage submersible pump, approximately 7 gallons of water were purged from MW-1 <br /> before being pumped "dry" Temperature, pH and conductivity were measured for stabilization at <br /> regular purge-volume intervals from each well using either an Oakton water analyzer or a Hydac <br /> water analyzer Field data and logs are included with Appendix A Purged ground water was <br /> containerized in 55-gallon drums and was stored on-site in an area lacking general public access <br /> • <br /> Advanced GeoEnvironmental,Inc <br />