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' Quarterly Report - Second Quarter 2002 • PACIFIC CAR WASH ' 4405 Pacific Avenue, Stockton, California ' 1.0. INTRODUCTION ' Advanced GeoEnvironmental,Inc (AGE)has prepared this quarterly report for 4405 Pacific Avenue (the site), Stockton, California The scope of work included conducting a quarterly ground water monitoring event and preparation of this report The site setting is illustrated in Figure I Site ' structures and monitoring well locations are depicted in Figure 2 This report has been prepared in accordance with guidelines issued by the California Regional Water ' Quality Control Board-Central Valley Region for investigation of underground storage tank(UST) sites A summary of previous investigations at the site was included in the AGE-prepared Preliminary Site Investigation and Evaluation Report-January 1997, dated 15 January 1997 I 2.0. PROCEDURES On 14 May 2002,a ground water monitoring event was performed at the site on wells MW-1 through MW-9, MW-10A and MW-10B (MW-1 through MW-10B), monitoring well construction details are summarized In Table 1 Ground water monitoring procedures for the site were outlined in the AGE-prepared Work Plan Addendum -June 1998, dated 10 June 1998, and approved by the San Joaquin County Environmental Health Department (SJCEHD)by letter dated 24 June 1998 At the request of the SJCEHD� �' g ground water monitoring activities at the site has been coordinated q to occur concurrently with the ground water monitoring activities at the Pacific Mini Mart site(4511 Pacific Avenue), the Pacific Mini Mart tabulated ground water elevation and analytical results are Included in Appendix A 2 1 WELL MONITORING AND EVACUATION 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 (T able 2) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) After water levels were measured, approximately 6 to 12 gallons of ground water (a minimum of three casing-water volumes per well) were evacuated (purged) from wells MW-1 through MW-5, MW-9, MW-10A and MW-10B utilizing a two-stage submersible pump, approximately 5%2 to 7%2 gallons of ground water were purged from MW-6 through MW-8 utilizing disposable bailers Approximately 6 gallons of water were purged from MW-1 before the well was purged "dry" Temperature,pH and conductivity were measured for stabilization at regular purge-volume intervals Advanced GeoEnvironmental,Inc