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i i15 November 1999 AGE-NC Project No 97-0249 iPage 3 of 5 ground water samples detected TPH-g, TPH-d and BTEX an five samples, MTBE was detected in itwo samples i3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT i During the August 1999 monitoring event, depths to ground water in wells MW-1 through MW-6 were measured between 12 64 and 15 56 feet below the tops of well casings, ground water elevations were calculated to be between 5 64 feet and 5 87 feet below mean sea level Ground water elevation i at the site decreased an average 6 93 feet between the April and the August 1999 ground water monitoring events The ground water elevation data for MW-I through MW-6 during the August 1999 ground water monitoring event as depicted in Figure 3 iGround water flow direction for the area bound by wells MW-1, MW-3, MW-4 and MW-6 vias generally toward the west-southwest at a gradient of 0 0013 ft/ft, or approximately 7 feet pet mile i (Figure 3), ground water flow direction for the area bound by wells MW-1, MW-2, MW-3 and MW- 4 was generally toward the northwest at a gradient of 0 0013 ft/ft, ground water flow direction for I the area bound by wells MW-2, MW-4 and MW-5 was generally toward the northeast at a gradient of 0 0013 ft/ft i Due to the low gradient at the site, slight variations an ground water measurements or changes of recharge/discharge of the local ground water could greatly modify ground water flow direction i32 LABORATORY RESULTS OF GROUND WATER SAMPLES iA total of six ground water samples were submitted to a DHS-certified laboratory in August 1999 TPH-g was detected an water samples collected from wells MW-1,MW-2,MW-3,MW-5 and MW-6 i at concentrations ranging up to 18,000 micrograms per liter (4g/l) TPH-d was detected an water samples collected from wells MW-1, MW-2, MW-3, MW-5 and MW-6 at concentrations ranging up to 1,600 kcg/l, however,the laboratory reported that the diesel chromatograms for the samples dad inot have typical diesel characteristics BTEX compounds were detected an ground water samples collected from wells MW-1,MW-2, MW- 3, MW-4 and MW-6 at concentrations ranging as high as 3,300,cg/l (benzene, MW-3) MTBE was detected an samples collected from MW-4 at a concentration of 50 kigll iMTBE was detected an ground water samples collected from wells MW-4 and MW-6 utilizing EPA . Method 8260 at concentrations as high as 47 ,ug/l No other fuel oxygenates were detected above laboratory reporting limits iAdvanced GcoEnvironmenial,Inc I