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1 <br /> 1 Quarterly Report - Second Quarter 2002 <br /> • THREE B'S TRUCK PLAZA <br /> 1 14749 Thornton Road, Lodi, California <br />' 1.0. INTRODUCTION AND SCOPE OF WORK <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 14749 Thornton <br /> Road (the site), Lodi, California The scope of work included conducting a quarterly ground water <br /> monitoring event and preparation of this report The objective was to monitor dissolved petroleum <br />' hydrocarbon concentrations in ground water and to characterize ground water flow direction and <br /> gradient on the site The site setting is illustrated in Figure 1 Site structures and monitoring well <br /> 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(RWQCB)for investigation of underground storage <br />' tank(UST)sites A summary of previous investigations at the site was included in Preliminary Site <br /> Investigation and Evaluation Report -November 1996, dated 20 June 1997, prepared by AGE <br />' 2.0. PROCEDURES <br />'• On 13 June 2002,ground water monitoring and sampling were performed at the site on ground water <br /> monitoring wells MW-1 through MW-6 and domestic drinking water well DW-1 (Figure 2), <br /> monitoring well construction details are summarized in Table 1 Ground water monitoring <br />' procedures were outlined in Work Plan Addendum-October 1998, dated 14 October 1998,prepared <br /> by AGE and approved by the San Joaquin County Environmental Health Department(SJCEHD)by <br /> letter dated 21 December 1998 <br />' request of the RW CB Three B's Truck Plaza's ground water monitoring events have been <br /> At the eq Q �' g <br />' coordinated to occur concurrently with the Flag City Chevron's(6421 Capitol Avenue)monitoring <br /> events,the Flag City Chevron tabulated ground water elevation results are 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 each well casing to the nearest <br /> 0 01-foot utilizing a Solmst water level meter The ground water elevation in each well was <br /> calculated by subtracting the measured depth to ground water from the surveyed casing elevation <br /> (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, between 6 and 7 gallons of ground water (a minimum of three <br />' casing-water volumes per well)were evacuated(purged)from wells MW-1 through MW-6 utilizing <br /> • disposable polyethylene bailers Temperature,pH and conductivity were measured for stabilization <br /> at regular purge-volume intervals from each well using an Oakton water analyzer Field data and logs <br />' Advanced CeoEnvironmental,Inc <br /> 1 <br />