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' Quarterly Report - Third Quarter 2001 <br /> • PACIFIC PRIDE - SOUTH EL DORADO STREET <br /> 3147 South El Dorado Street, Stockton, California <br /> ' 1.0. INTRODUCTION <br /> ' Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 3147 South El <br /> Dorado Street (the site), Stockton, California The site setting is Illustrated on Figure 1 Site <br /> ' structures and monitoring 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 for investigation of underground storage tank (UST) sites <br /> ' Background information is summarized in Preliminary Investigation and Evaluation Report-June <br /> 1999, dated 26 July 1999,prepared by AGE <br /> 2.0. PROCEDURES <br /> On 26 September 2001, ground water monitoring and sampling were performed at the site on wells <br /> MW-1, MW-2, MW-3 MW-4, MW-5, MW-6 and MW-7 (MW-1 through MW-7) Ground water <br /> ' 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 San Joaquin County <br /> Public Health Services - Environmental Health Division (PHS-EHD) letter dated 23 September <br /> ' 1999 <br /> ' 2 1 WELL MONITORING AND EVACUATION <br /> Depth to ground water was measured in each well at the site from the tops of the well casings to the <br /> ' nearest 0 01-foot utilizing a Solinst water level meter Ground water elevation in each well at the site <br /> was calculated by subtracting the measured depth to ground water from the surveyed casing <br /> elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map <br /> ' (Figure 3) <br /> After water levels were measured, approximately 4 to 10 gallons of ground water(a mimmum of <br /> ' three casing-water volumes per well)were removed from wells MW-1 through MW-4, MW-6 and <br /> MW-7 utilizing disposable polyethylene bailers, approximately 28 gallons of ground water were <br /> removed from well MW-5 utilizing a two-stage submersible pump Temperature, pH and <br /> conductivity were measured for stabilization at regular purge-volume intervals from each well using <br /> an Oakton water analyzer Field data and logs are in Appendix A Purged ground water was <br /> Advanced GeoEnvironmental,Inc <br /> I <br />