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i I26 March 2001 AGE-NC Project No 95-0130 Page 3 of 5 were calculated to be between 22 64 feet and 23 23 feet below mean sea level Ground water elevation at the site decreased an average 2 22 feet between the June 2000 and the October 2000 ground water monitoring events The ground water elevation data for MW-1 through MW-5 during the October 2000 ground water monitoring event is depicted in Figure 3 Ground water monitoring data collected at Top Filling Station wells MW-1 through MW-5 indicated a ground water flow direction generally toward the east-northeast at a gradient of 0 005 ft/ft or less, or approximately 26 feet or less per mile (Figure 3) 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES A total of nine ground water samples were submitted to a DHS-certified laboratory in October 2000 TPH-g was detected in water samples collected from wells MW-3,MW-4,MW-5, VW-1B,VW-1C, VW-2A and VW-3A at concentrations ranging between 400 and 240,000 micrograms per liter(E.cg/1), the laboratory reported each TPH-g chromatogram as having unmodified or weakly modified gasoline patterns �. BTEX compounds were detected in water samples collected from wells MW-2, MW-3, MW-4, MW-5, VW-1B, VW-1C, VW-2A and VW-3A at concentrations as high as 57,000,ug/l (toluene, VW-1B) The greatest benzene-impact was detected from well VW-1C at a concentration of 39,000 MTBE was detected in ground water samples collected from wells MW-2, MW-3, MW-4, VW-113, VW-1C,VW-2A and VW-3A at concentrations as high as 9,1001ug/l, TBA was detected in a water sample collected from well MW-5 at a concentration of 100 µg/1 No other fuel oxygenated compounds were detected in any other ground water samples 1,2-DCA was detected in water samples collected from wells MW-2, MW-3, VW-1B, VW-1C and VW-2A at concentrations as high as 260,ug/l Previous and current analytical results of ground water monitoring well samples are summarized in Tables 2 and 3, the estimated extent of dissolved petroleum hydrocarbons is depicted in cross sectional views C-C' and D-D' (Figures 6 and 7, respectively) The laboratory reports (McCampbell Analytical Inc I D No 51917 through 51925) and chain-of-custody forms are presented in Appendix,B 4.0. SUMMARY AND CONCLUSIONS The implications from the October 2000 ground water monitoring event are as follows • Groundwater monitoring data collected in the area of wells MW-1 through MW-5 indicated Advanced Geo Environmental,Inc