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1 <br /> 06 June 2003 <br /> • AGE-NC Project No 97-0301 <br /> Page 3 of 5 <br /> ' direction for the area bound by wells MW-1 through MW-7 was inferred to be towards the east- <br /> northeast at a gradient of 0 001 ft/ft or less, or approximately 6 feet per mile (Figure 3) <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in water samples collected from wells MW-1 and MW-7 at concentrations of <br /> 6,500 micrograms per liter(ug/l)and 46,000µg/1(Figure 4),however the laboratory reported both <br /> samples as having significant unmodified or weakly modified gasoline TPH-d was detected in the <br /> same samples at concentrations as high as 4,500µg11 from MW-7(Figure 5),however,the laboratory <br /> reported the samples from MW-1 and MW-7 as having significant gasoline range compounds TPH- <br /> k was detected in the water samples collected from MW-1 and MW-7 at concentrations as high as <br /> 6,000,ug/l (MW-7) - <br /> BTE&X compounds were detected in ground water samples collected from wells MW-1 and MW-7 <br /> ' at concentrations ranging as high as 8,800 ug/l of benzene in MW-7 <br /> Utilizing EPA Method 8260B, MTBE was detected in water samples collected from wells MW-1, <br /> ' MW-2,MW-3 and MW-6 at concentrations ranging between 0 81µg11 and 8,U g/l TBA was detected <br /> in water samples collected from MW-1 and MW-7 at concentrations of 37 ,ug/1 and 83 µg11, <br /> respectively, and 1,2-DCA was detected In water samples collected from wells MW-1 and MW-7 <br /> at concentrations of 25 ugll and 480 µg11, respectively No other fuel components were detected <br /> during the laboratory analysis <br /> Previous and current analytical results of ground water monitoring well samples are summarized in <br /> Tables 3 and 4 The laboratory reports ( McCampbell Analytical Inc Work Order 0212014) and <br /> ' cham-of-custody forms are presented in Appendix B <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> The implications from the December 2002 ground water monitoring event are as follows <br /> ' • Groundwater flow direction for the area bound by wells MW-1 through MW-7 was inferred <br /> to be towards the east-northeast at a gradient of 0 001 ft/fl or less(Figure 3) Due to the low <br /> t gradient at the site, slight variations in ground water measurements or changes of <br /> recharge/discharge of the local ground water could greatly modify ground water flow <br /> direction <br /> 1 <br /> ' Advanced GeoEnvironmental,Inc <br /> I <br />