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20 October 2003 • AGE-NC Project No 97-0301 Page 3 of 5 1 in Figure 3 The inferred ground water flow direction for the area was inferred to radiate to the inortheast, southeast and southwest at gradients ranging from 0 002 feet/feet to 0 006 feet/feet ' 32 LABORATORY RESULTS OF GROUND WATER SAMPLES TPH-g was detected in water samples collected from wells MWA and MW-7 at concentrations of 5,800 micrograms per liter(µg/1)and 43,000µg11,respectively,however the laboratory reported both samples as having significant unmodified or weakly modified gasoline TPH-d was detected in the ' same samples at concentrations of 1,100 µg11 and 3,400 µg/l, respectively, however the laboratory reported the samples from MW-1 and MW-7 as having significant gasoline range compounds TPH- k was detected in the same samples at concentrations of 1,400 µg/l and 4,400 gg/l, respectively BTE&X compounds were detected in ground water samples collected from wells MW-1,MW-6 and MW-7 at concentrations as high as 8,300 µg/1 of benzene in MW-7 Utilizing EPA Method 8260B, MTBE was detected in water samples collected from wells MW-1, MW-2, MW-3, MW-4 and MW-6 at concentrations of 14 µg/l, 2 0 µg/1, 0 96 gg/1, 0 56 µg/1 and ' 6 4gg/l,respectively 1,2-DCA was detected in the water samples collected from wells MW-1 and MW-7 at concentrations of 37 µg/1 and 510 µg11, respectively TAME was detected in the water samples collected from well MW-6 at concentrations of 12 µg/l No other fuel components were detected during the laboratory analysis aria mw-z D,Sz,u��t- �m•i�� Previous and current analytical results of ground water monitoring well samples are summarized in Tables 3 and 4 The laboratory reports ( McCampbell Analytical Inc Work Order 0307005) and chain-of-custody forms are presented in Appendix B 4.0. SUMMARY AND CONCLUSIONS The implications from the June 2003 ground water monitoring event are as follows • Ground water flow direction for the area bound by wells MW-I through MW-7 was inferred ' to be radiating to the northeast, southeast, and southwest at gradients ranging from 0 002 to 0 006 feet/feet (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 • Ground water elevation generally decreased at the site an average 0 69 feet between the ' March 2003 and the June 2003 ground water monitoring events The decrease in ground . water elevation is probably due to seasonal fluctuation ' Advanced GeoEnvironmental,Inc