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1 ' <br /> '17 June 2003 <br /> AGE-NC Project No 95-0121 <br /> Page 3 of 5 <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> ,The depths to ground water in wells MW-1 through MW-7 were measured at between 17 12 and <br />' 18 06 feet below the tops ofwell casings The ground water elevations were calculated to be between <br /> 10 77 feet(MW-6) and 11 26 feet(MW-2)below mean sea level The ground water elevation data <br /> obtained during this monitoring event are depicted in Figure 3 The inferred ground water flow <br />' direction for the area bound by wells MW-1 through MW-7 was inferred to be towards the northeast <br /> at a gradient of 0 004 ft/ft or less, or approximately 21 feet per mile (Figure 3) <br /> I <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in water samples collected from wells MW-1 through MW-4 and MW-7 at <br /> concentrations ranging between 6,000 micrograms per liter(µg/1)and 35,000,ug/1(Figure 4) TPH-d <br />' was detected in the same samples at concentrations as high as 3,700µg/1 from MW-3,however,the <br /> laboratory reported that all TPH-d sample chromatograms as having significant gasoline range <br /> compounds <br /> BTEX constituents were detected in ground water samples collected from wells MW-1 through <br /> MW-4 and MW-7 at concentrations ranging as high as 8,400µg/1 of benzene in MW-2 <br />' Utilizing EPA Method 8260B, MTBE was detected in water samples collected from wells MW-1 <br /> through MW-5 at concentrations'ranging between 1 6 µg/1 and 150 µg/1 TBA was detected in a <br />' water sample collected from MW-lat a concentration of 80 µg/1 No other fuel components were <br /> detected during the laboratory analysis <br />' Previous and current analytical results of ground water monitoring well samples are summanzed in <br /> Tables 3 and 4 The laboratory reports (McCampbell Analytical Inc Work Order 0303134) and <br /> chain-of-custody forms are presented in Appendix C <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> r <br /> The implications from the March 2003 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 northeast at a gradient of 0 004 ft/ft or less (Figure 3) Due to the low <br /> 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 /> Advanced GeoEnvironmental,Inc <br />