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I03 January 2002 AGE-NC Project No 96-0229 IPage 3 of 5 I The general ground water gradient in the area of wells MW-1 through MW-8 was calculated to be approximately 0 003 ft/ft or less, or approximately 16 feet per mile and Inferred to be flowing towards the northeast, ground water flow direction In the area of wells MW-7, MW-9 and MW-10 I was Inferred towards the northeast at a gradient of 0 01 ft/ft or less The ground water surface elevation at the site is approximately 17 and 19 feet above the slotted screen Intervals in wells MW-1 and MW-10B, respectively, but within the screened Intervals of the screened Intervals of the remaining wells 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES A total of eleven ground water samples were submitted to a DHS-certified laboratory TPH-g was detected in water samples collected from wells MW-1, MW-2, MW-3, MW-6, MW-7, MW-9 and MW-10A at concentrations ranging as high as 87,000 micrograms per liter(/zg/1) IBTEX compounds were detected in ground water samples collected from wells MW-1, MW-2, MW-3, MW-6, MW-9 and MW-10A at concentrations ranging as high as 21,000 µg/1 (xylene, � . MW-2 and MW-6) The highest benzene concentration was detected in sample MW-1 at a concentration of 12,000µg/1 MTBE was detected (EPA 8260) in ground water samples collected from wells MW-1, MW-3, MW-6, MW-7, MW-8, MW-9 and MW-10A at concentrations ranging as high as 2,220 /,cg/l (MW-7) DIPE was detected in a water sample collected from MW-1 at a concentration of 11 ,ug/l, TBA was detected from MW-IOA at a concentration of 15 µg/1 No other constituents of concern were detected above laboratory reporting limits in the analyzed samples Previous and current analytical results of ground water monitoring well samples are summarized In Tables 2 and 3 The laboratory reports (Castle Analytical Laboratories Reference No 4105 and McCampbell Analytical Inc Lab I D 80054-64) and chain-of-custody forms are presented in Appendix B 4.0. SUMMARY AND CONCLUSIONS The implications from the findings of the September 2001 Investigation are • Ground water flow direction in the area of wells MW-1 through MW-8 was Inferred towards the northeast at an approximate gradient of 0 003 fl/ft This appears to be the prevailing flow direction for the area • Ground water flow direction In the area of wells MW-7, MW-9 and MW-10 was inferred Advanced GeoEnvironmental,Inc