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s ' <br /> ke <br /> Quarterly Report - Fourth Quarter 2001 <br /> GREWAL'S MARKET <br />' 4100 East Fremont Street, Stockton, California <br />' 1.0. INTRODUCTION <br /> Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly report for 4100 East Fremont <br /> Street, Stockton, California. The site setting is illustrated on Figure 1. Site structures and monitoring <br /> well locations are depicted on Figure 2. <br /> The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water flow direction and gradient on the site. This report has been <br />' prepared in accordance with guidelines issued by the California Regional Water Quality Control <br /> Board- Central Valley Region(RWQCB) for investigation of underground storage tank(UST) sites. <br /> A summary of previous investigations at the site was included in Preliminary Investigation and <br /> Evaluation Report, dated 27 September 1999 and prepared by AGE. <br /> ' 2.0. PROCEDURES <br /> On 18 December 2001, ground water monitoring and sampling was performed at the site on wells <br /> MW-1,MW-2 and MW-3;monitoring well construction details are summarized in Table 1. Ground ; <br /> ' water monitoring procedures for the site were outlined in Monitoring Well Installation Work Plan - <br /> September 1999, dated 01 September 1999, prepared by AGE and approved by the San Joaquin a' <br /> ' County Environmental Health Department(SJCEHD) by letter dated 23 September 1999. <br /> ' 2.1. WELL MONITORING AND EVACUATION <br /> ' Depth to ground water was measured in each well from the top of each well casing to the nearest <br /> 0.01-foot utilizing a Solinst water level meter. Ground water elevation in each well at the site was <br /> calculated by subtracting the measured depth to ground water from the surveyed casing elevations <br /> ' (Table 2). Ground water elevations were plotted and contoured on a scaled site map (Figure 3). <br /> After water levels were measured, approximately 5 to 7 gallons of ground water(a minimum of three <br /> ' casing-water volumes per well) were evacuated (purged) from wells MW-1, MW-2 and MW-3 <br /> utilizing polyethylene disposable bailers. Temperature, pH and conductivity were measured for <br /> stabilization at regular purge-volume intervals from each well using an Oakton water analyzer. Field <br /> 1 data and logs are included with Appendix A. Purged ground water was containerized in 55-gallon <br /> drums and was stored on-site in an area lacking general public access. <br /> Advanced GeoEnvironcnental,Inc. <br /> 1 <br />