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i Quarterly Report - Fourth Quarter 2000 THREE B'S TRUCK PLAZA I14749 Thornton Road, Lodi, California 10 INTRODUCTION AND SCOPE OF WORK Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the fourth quarter ' of the year 2000 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 This report is prepared I in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD) and by the California Regional Water Quality Control Board - Central Valley Division (RWQCB) for investigation of underground storage tank (UST) I 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 13 December 2000, ground water monitoring and sampling was performed at the site on wells MW-1, MW-2, MW-3, MW-4, MW-5, MW-6 and the domestic drinking water well (DW-1) Ground water monitoring procedures for the site were outlined in Work Plan Addendum - October I1998, dated 14 October 1998 prepared by AGE and approved by the PHS-EHD by letter dated 21 December 1998 IA 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 with Appendix A I2 1 MONITORING WELL PURGE PROCEDURES Depths to ground water were 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 elevations in each well at the site were 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 snap (Figure 3) After water levels were measured, approximately 6 to 7 gallons of ground water(a minimum of three casing-water volumes per well) were removed from wells MW-1 through MW-6 utilizing a two- stage submersible pump or by hand-bailing with a disposable bailer Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using a ICM water analyzer Field data and logs are in Appendix B Purged ground water was Advanced CeoFnvironmental,Inc