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1 ' Quarterly Report - First Quarter 2002 • THREE B'S TRUCK PLAZA ' 14749 Thornton Road, Lodi, California ' 1.0. INTRODUCTION AND SCOPE OF WORK ' Advanced GeoEnviron mental, Inc (AGE) has prepared this quarterly report for 14749 Thornton Road (the site), Lodi, California The scope of work included conducting a quarterly ground water monitoring event and preparation of this report The objective was to monitor dissolved petroleum ' hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site The site setting is illustrated in Figure 1 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 (RWQCB) for investigation of underground storage ' tank(UST) sites A summary of previous Investigations at the site was included in Preliminary Site Investigation and Evaluation Report -November 1996, dated 20 June 1997, prepared by AGE ' 2.0. PROCEDURES • On 26 & 27 March 2002, ground water monitoring and sampling were performed at the site on ground water monitoring wells MW-1 through MW-6 and domestic drinking water well DW-1 (Figure 2), monitoring well construction details are summarized in Table 1 Ground water monitoring procedures were outlined in Work Plan Addendum - October 1998, dated 14 October 1998,prepared by AGE and approved by the San Joaquin County Environmental Health Department ' (SJCEHD) by letter dated 21 December 1998 At the request of the RWQCB, Three B's Truck Plaza's ground water monitoring events have been coordinated to occur concurrently with the Flag City Chevron's (6421 Capitol Avenue) monitoring events, the Flag City Chevron tabulated ground water elevation 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 ' (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) After water levels were measured,between 7 and 7%2 gallons of ground water (a minimum of three casing-water volumes per well) were evacuated (purged) from wells MW-1 through MW-6 utilizing disposable polyethylene bailers Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an Oakton water analyzer Field data and logs IAdvanced GcoEnvironmental,Inc