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08 January 2001 AGE-NC Project No 97-0249 Page 3 of 5 feet below the tops of well casings, ground water elevations were calculated to be between 2 33 feet and 2 51 feet below mean sea level Ground water elevation at the site increased an average 3 93 feet between the August 2000 and the December 2000 ground water monitoring events The ground water elevation data for MW-1 through MW-6 during the December 2000 ground water monitoring event is depicted in Figure 3 Ground water monitoring data collected at Three B's Truck Plaza wells MW-1 through MW-6 and Flag City Chevron wells MW-7, MW-12A and MW-13A indicated a ground water flow direction generally toward the east-southeast to southeast at a gradient of 0 001 ft/ft or less, or approximately 5 feet or less per mile (Figure 3) I3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES A total of six ground water samples were submitted to a DHS-certified laboratory in December 2000 TPH-g was detected in water samples collected from wells MW-1,MW-2,MW-3,MW-5 and MW-6 at concentrations ranging between 140 and 15,000 micrograms per liter (ug/l), the laboratory reported each TPH-g chromatogram as having unmodified or weakly modified gasoline patterns TPH-d was detected in all six of the water samples at concentrations ranging between 89 and 2,500 ,ug1l, however, the laboratory reported that the diesel chromatograms from each sample chromatogram contained significant lighter range gasoline compounds, unmodified or weakly modified diesel or that the diesel range compounds were significant BTEX compounds were detected in all six ground water samples at concentrations ranging between 0 66 and 3,000 4gll (benzene, MW-6) ' MTBE was detected in a ground water samples collected from wells MW-1, MW-2, MW-4 and MW-6 at concentrations as high as 61 ,ug/l Ethanol was detected in the ground water sample collected from well MW-5 at a concentration of 110 ug/l No other fuel oxygenated compounds were detected in any other ground water samples Laboratory analysis of the sample collected from domestic drinking water well DW-1 did not detect any constituents of concern above laboratory reporting limits Analytical results of the ground water samples are summarized in Table 2, analytical results of the ground water samples collected from the domestic drinking water well DW-I are summarized in Table 3 The laboratory reports (McCampbell Analytical Inc I D No 55979 through 55984) and chain-of-custody forms are presented in Appendix C Advanced GeoEnvironmental,Inc