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i 23 April 2002 • AGE-NC Project No 97-0301 Page 3 of 5 monitoring events The ground water elevation data obtained during the December 2001 ground water monitoring event is depicted to Figure 3 The inferred ground water flow direction for the area bound by wells MW-1 through MW-7 was inferred to be towards the east-northeast at a gradient of 0 002 ft/ft or less, or approximately 10 feet per mile (Figure 3) I 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES A total of seven ground water samples were submitted to McCampbell Analytical,Inc ,a DHS-certified laboratory, for analysis TPH-g was detected in water samples collected from wells MW-1 and MW-7 at concentrations as high as 45,000 micrograms per liter(µg/1), the laboratory reported both samples as having significant umnodified or weakly modified gasoline TPH-d was detected in the water samples collected from MW-1 and MW-7 at concentrations as high as 3,700 µg11, the laboratory reported the samples from MW-1 and MW-7 as having significant gasoline range compounds TPH-k was detected in the water samples collected from MW-1 and MW-7 at concentrations as high as 6,400 1 µg11, the laboratory reported the sample chromatograms as having significant gasoline range compounds BTEX compounds were detected in ground water samples collected from wells MW-1, MW-4, MW-5 and MW-7 at concentrations ranging as high as 9,500µg/l (benzene in MW-7) I MTBE was detected in a water sample collected from well MW-1 at a concentration of 27 µg11, TBA was detected In a water sample collected from well MW-1 at a concentration of 230µg11, 1,2-DCA was detected In water samples collected from wells MW-1 and MW-7 at concentrations as high as 590µg11, ' EDB was detected in a water sample collected from MW-1 at a concentration of 8 6µg11 No other fuel components were detected during the laboratory analysis ' Previous and current analytical results of ground water monitoring well samples are summarized in Tables 2 and 3 The laboratory reports (McCampbell Analytical Inc Lab I D 87271 through 87277) ' and chain-of-custody forms are presented in Appendix B 4.0. SUMMARY AND CONCLUSIONS The implications from the December 2001 ground water monitoring event are as follows • Groundwater flow direction for the area bound by wells MW-1 through MW-7 was inferred � to be towards the east-northeast at a gradient of 0 001 ft/ft or less (Figure 3) Due to the low ' gradient at the site, slight variations in ground water measurements or changes of . recharge/discharge of the local ground water could greatly modify ground water flow direction ' Advanced GeoEnvironmental,Inc