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1 <br /> 04 March 2002 <br /> AGE-NC Project No 96-0249 <br /> Page 3 of 6 <br />' 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br />' 11 December 2001, the containinant impact to ground water was assessed from the ground water <br /> laboratory data collected on 12 December 2001 <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' The depths to ground water in wells MW-1 through MW-6 vaned from 11 90 to 15 12 feet below <br /> the tops of the well casings, ground water elevations were calculated to be between 5 13 feet and <br /> 5 41 feet below mean sea level Ground water elevation at the site increased an average 2 89 feet <br />' between the September 2001 and the December 2001 ground water monitoring events The ground <br /> water elevation data for MW-1 through MW-6 during the December 2001 ground water monitoring <br /> event is depicted in Figure 3 <br /> Ground water flow direction in the area bound b Three B's Truck Plaza wells MW-1 through <br /> ough <br /> MW-6 was inferred to be towards the east at a gradient of 0 001 ft/ft or less, or approximately 5 feet <br /> per mile (Figure 3) <br /> r3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES <br /> A total of six ground water samples were submitted to a DHS-certified laboratory in December 2001 <br /> TPH-g was detected in water samples collected from wells MW-1,MW-2,MW-3,MW-5 and MW-6 <br /> at concentrations ranging between 67 and 19,000 micrograms per liter(µg11), the laboratory reported <br /> each TPH-g chromatogram as having unmodified or weakly modified gasoline patterns TPH-d was <br /> detected in water samples collected from MW-1,MW-2,MW-3 and MW-6 at concentrations ranging <br /> between 310 and 3,800µg11, however, the laboratory noted that the diesel range hydrocarbons in the <br /> samples had non-diesel patterns and the samples contained significant lighter gasoline range <br /> compounds <br />' BTEX compounds were detected in water samples collected from MW-1,MW-2, MW-3,MW-5 and <br /> MW-6 at concentrations ranging as high as 3,600µg/l(benzene,MW-6), MTBE was detected in the <br /> water samples collected from MW-4 at a concentration of 90µg/1 by the EPA 8020 analysis <br /> MTBE was detected in water samples collected from MW-1, MW-2, MW-4 and MW-6 utilizing <br /> EPA Method 8260 Modified at concentrations as high as 80 µg/l, TBA was detected in a water <br /> sample collected from MW-3 at a concentration of 110 µg/1 No other fuel oxygenated compounds <br /> were detected in the ground water samples <br /> Advanced GeoEnwronmental,Inc <br />