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Ir ' 07 June 2002 AGE-NC Project No 97-0333 ' Page 6 of 9 ' 16 15 and 16 31 feet above mean sea level (Figure 3) Ground water elevation at the site increased by an average of 2 37 feet between the December 2001 and the February 2002 ground water monitoring events Ground water flow direction for the area bound by wells MW-1 through MW-6 ' indicated that local ground water flow direction was radially inward towards the area of wells EW-1, MW-2 and MW-6 at an approximate gradient of 0 003 ft/ft or less,or approximately 16 feet per mile 3 4 2 LABORATORY RESULTS OF GROUND WATER SAMPLES ' A total of six ground water samples were submitted to Castle Analytical Laboratory (CAL), a DHS-certified laboratory, in February 2002 The laboratory analysis detected TPH-g in water samples collected from wells MW-1, MW-2, MW-3, MW-4 and MW-6 at concentrations as high ' as 110,000 /,z g/1 BTEX constituents were detected at wells MW-2, MW-4 and MW-6 at concentrations as high as ' 5,100 µgll xylenes The greatest benzene concentrations were detected from well MW-2 at a C concentration of 1,600µg/1 10 MTBE was detected by EPA Method 8020 in the water samples from MW-1 through MW-4 and MW-6 at concentrations as high as 150,000 4gll (MW-2), MTBE was detected from MW-1,MW-2, MW-3 and MW-6 utilizing EPA Method 8260 Modified at concentrations as high as 150,000µg/1 (MW-2) ' Utilizing EPA Method 8260 Modified, TAME was detected in sample MW-1 at a concentration of 5 2 ,ug/l, PCE was detected from MW-4 at a concentration of 860,ug/l, and 1,3,5-tnmethylbenzene r and 1,2,4-tnmethylbenzene were detected from wells MW-2 and MW-6 at concentrations as high as 1,300µg/1 No other fuel components or volatile organic compounds (VOCs)were detected above the respected laboratory reporting limits Previous and current analytical results of ground water monitoring well samples are summarized in Tables 6 and 7 The laboratory reports (Castle Analytical Laboratory Reference No 4454, McCampbell Analytical Inc Lab I D 0203005) and chain-of-custody forms are presented in Appendix E 4.0. SUMMARY ANIS CONCLUSIONS The implications from the February 2002 ground water monitoring event are as follows Advanced Gen Enwronmental,Inc