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�-� Quarterly Report - First Quarter 2002 <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 /> LW <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 /> LW sites. A summary of previous investigations at the site was included in the AGE-prepared Preliminary <br /> Site Investigation and Evaluation Report-January 1997, dated 15 January 1997. <br /> 2.0. PROCEDURES <br /> On 14 February 20014 ground water monitoring event was performed at the site on wells MW-1 <br /> through MW-9, MW-IOA and MW-1 OB (MW-1 through MW-IOB); monitoring well construction <br /> details are summarized in Table 1. Ground water monitoring procedures for the site were outlined in <br /> the AGE-prepared Work Plan Addendum -June 1998, dated 10 June 1998, and approved by the San <br /> Joaquin County Environmental Health Department (EHD)by letter dated 24 June 1998. <br /> `" At the request of the EHD, ground water monitoring activities at the site has been coordinated to <br /> occur concurrently with the ground water monitoring activities at the Pacific Mini Mart site (4511 <br /> Pacific Avenue); the Pacific Mini Mart tabulated ground water elevation and analytical results are <br /> included in Appendix A. <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 Solinst 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 2). <br /> tw 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 minimum of three <br /> �- casing-water volumes per well)were evacuated (purged) from wells MW-1 through MW-5, MW-9, <br /> MW-1 OA and MW-1 OB utilizing a two-stage submersible pump; MW-6 through MW-8 were purged <br /> utilizing disposable bailers. Approximately 6 gallons of water were purged from MW-I before the <br /> well was purged"drys'. Temperature,pH and conductivity were measured for stabilization at regular <br /> purge-volume intervals from each well using an Oakton water analyzer. Field data and logs are <br /> Advanced GeoEnvironmental,Inc. <br /> it <br />