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' 22 July 2003 S AGE-NC Project No 97-0301 ' Page 3 of 5 ' Figure 3 The inferred ground water flow direction for the area was inferred to be northeast to southeast at a gradient of 0 003 ft/ft or less (Figure 3) t3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES ' TPH-g was detected in water samples collected from wells MW-1 and MW-7 at concentrations of 5,700 micrograms per liter(µg11)and 45,000 gg/l,respectively,however the laboratory reported both samples as having significant unmodified or weakly modified gasoline (Figure 4) TPH-d was ' detected in the same samples at concentrations of 1,600 µg/1 and 2,600 µg11,respectively,however the laboratory reported the samples from MW-1 and MW-7 as having significant gasoline range compounds(Figure 5) TPH-k was detected in the same samples at concentrations of 2,400 gg/l and ' 3,100µ.g/1,respectively(MW-7) TPH-mo was detected in the samples from well MW-5,MW-6 and MW-7 at concentrations of 380 µg11, 390µg/l and 420 µg/1, respectively ' BTEX compounds were detected in ground water samples collected from wells MW-1,MW-4 and MW-7 at concentrations ranging as high as 8,300 gg/l of benzene in MW-7 '• Utilizing EPA Method 8260B, MTBE was detected in water samples collected from wells MW-1, MW-2, and MW-6 at concentrations of 7 µg/1, 0 67 gg/l and 1 7 µg/1, respectively TBA was ' detected in the water sample collected from MW-7 at a concentration of 58 gg/1 1,2-DCA was detected in the water samples collected from wells MW-1 and MW-7 at concentrations of 13 µg/1 and 280 µg/1,respectively 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 3 and 4 The laboratory reports ( McCampbell Analytical Inc Work Order 0303329) and ' chain-of-custody forms are presented in Appendix B ' 4.0. SUMMARY AND CONCLUSIONS The implications from the March 2003 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 northeast to southeast at a gradient of 0 003 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 1 • ' Advanced GeoEnvironmental,Inc 1