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1 ' Quarterly Report - Second 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 second 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 IThe objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site Tlus report is prepared ' in accordance with guidelines established 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 GROUND WATER MONITORING AND SAMPLING PROCEDURES On 13 June 2001,ground water monitoring and sampling were performed at the site on ground water ' monitoring wells MW-1, 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 Ietter dated 21 December 1998 ' A coordinated effort was made between Three B's Truck Plaza and Flag City Chevron(6421 Capitol Avenue)to conduct ground water monitoring activities concurrently, the Flag City Chevron tabulated ground water elevation results are included in Appendix A 21 MONITORING WELL PURGE PROCEDURES Depth to ground water was measured in each well from the tops of the well casings to the nearest 0 01-foot utilizing a Solinst 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 removed from wells MW-1 through MW-6 utilizing a disposable polyethylene bailer Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an ICM water analyzer Field data and logs are in Appendix B Purged ground water was containerized in 55-gallon drums and was stored on- IAdvanced GeoEnvironmental,Inc