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Quarterly Report - Fourth Quarter 2001 • THREE B'S TRUCK PLAZA ' 14749 Thornton Road, Lodi, California ' 1.0. INTRODUCTION AND SCOPE OF WORK Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the fourth quarter ' 2001 for 14749 Thornton Road, Lodi, California The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 ' The objective of the work was to momtor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site 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 QUARTERLY GROUNDWATER MONITORING AND SAMPLING PROCEDURES On 11 and 12 December 2001, ground water monitoring and sampling were performed at the site on ground water monitoring wells MWA, MW-2, MW-3, MW-4, MW-5, MW-6 (MW-1 through MW-6) and domestic drinking water wells DW-1 and RDW-1 (Figure 2) Ground water monitoring procedures for the site were outlined in Work Plan Addendum - October 1998, dated 14 October 1998, prepared by AGE and approved by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD)by letter dated 21 December 1998 tThe Three B's Truck Plaza and Flag City Chevron (6421 Capitol Avenue) ground water monitoring events were conducted concurrently, the Flag City Chevron tabulated ground water elevation results ' are included in Appendix A ' 2 1 WELL MONITORING AND EVACUATION On 11 December 2001, depth to ground water was measured in each well from the tops of the well ' casings to the nearest 0 01-foot utilizing a Solmst water level meter Ground water elevation in each well at the site was calculated by subtracting the measured depth to ground water from the surveyed casing elevations(Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) After water levels were measured, approximately 5 to 6% 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 Advanced GeoEnvironmental,Inc