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1 Quarterly Report - Fourth Quarter 2001 <br /> PACIFIC PRIDE - SOUTH ELDORADO STREET <br /> I ' 3147 South El Dorado Street, Stockton, California <br /> 1.0 INTRODUCTION <br /> At the request of Mr David Atwater, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> quarterly report for 3147 South El Dorado Street (the site), Stockton, California The site setting is <br /> illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 <br /> tThe 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 Board- <br /> ' Central Valley Region for Investigation of underground storage tank (UST) sites Background <br /> information is summarized in the AGE-prepared Preliminary Investigation and Evaluation Report- <br /> ' June 1999, dated 26 July 1999 <br /> 2.0. PROCEDURES <br /> i <br /> On 20 December 2001, ground water monitoring and sampling were performed at the site on wells <br /> MW-1 through MW-7,as-built monitoring well construction details are summarized in Table 1 Ground <br /> water monitoring procedures for the site were outlined in the AGE-prepared Monitoring Well <br /> Installation Work Plan - September 1999, dated 01 September 1999 and approved by San Joaquin <br /> ' County Environmental Health Department (SJCEHD) letter dated 23 September 1999 <br /> 2 1 WELL MONITORING AND EVACUATION <br /> The depths 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 elevations (Table 1) <br /> Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 4 to 10 gallons of ground water(a minimum of three <br /> casmg-water volumes per well)were removed from wells MW-1 through MW-4, MW-6 and MW-7 <br /> utilizing disposable polyethylene bailers, approximately 29 gallons of ground water were removed from <br /> well MW-5 utilizing a two-stage submersible pump Temperature,pH and conductivity were measured <br /> for stabilization at regular purge-volume intervals from each well using a Hydac water analyzer Copies <br /> of field data and logs are in Appendix A Purged ground water was containerized in 55-gallon drums <br /> and was stored on-site in an area lacking general public access <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br /> I <br />