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<br /> i06 July 1999
<br /> AGE-NC Project No 95-0173
<br /> iPage 3 of 6
<br /> i well casings, ground water elevations were calculated to be between 13 61 feet and 14 46 feet below
<br /> mean sea level Ground water elevation at the site increased an average 1 84 feet between the
<br /> January and April 1999 ground water monitoring events, generally, a long term trend of increasing
<br /> i ground water elevations is indicated by data obtained at the site since August 1996 The ground
<br /> water elevation data for MW-1 through MW-12 during the April 1999 ground water monitoring
<br /> event is depicted in Figure 3
<br /> iGround water flow direction for the area bound by wells MW-1 through MW-4, MW-6, MW-7,
<br /> MW-8 and MW-12 was generally toward the east at a gradient of 0 002 ft/ft, or approximately l h
<br /> i feet per mile (Figure 3), ground water flow direction for the area bound by wells MW-4, MW-5,
<br /> MW-7, MW-9, MW-10 and MW-11 was generally toward the east-northeast at a gradient of 0 002
<br /> ft/ft
<br /> Ground water was approximately 6 feet above the screened intervals in monitoring wells MW-1,
<br /> MW-2, MW-3 and MW-4, ground water was approximately 26 and 36 feet above the screen
<br /> intervals at AW-1B and AW-2B, respectively, therefore these wells are "drowned" and do not yield
<br /> samples representative of shallow ground water
<br /> lie x.
<br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES
<br /> A total of thirteen ground water samples were submitted to a DHS-certified laboratory in April 1999
<br /> TPH-g was detected in water samples collected from wells MW-I through MW-4, MW-6, MW-9,
<br /> MW-10, VW-1,AW-IB and AW-2B at concentrations ranging up to 270,000 micrograms per liter
<br /> (µg11) TPH-d was detected in water samples collected from wells MW-1 through MW-4, MW-6,
<br /> MW-7, MW-8, MW-9, MW-10, MW-12, VW-1, AW-1B and AW-2B at concentrations ranging up
<br /> to 14,000,ug/l, however, the laboratory reported that the diesel chromatograms for the samples did
<br /> not have typical diesel characteristics
<br /> BTEX compounds were detected in ground water samples collected from wells MW-1 through MW-
<br /> 4, MW-6, MW-7, MW-8, MW-9, MW-10, VW-1, AW-IB and AW-2B at concentrations ranging
<br /> I as high as 71,000 µg/1 (toluene, VW-1) The greatest benzene concentration was detected from well
<br /> ...w'-1 to a Lom entrauon of h 8,000 µg/l
<br /> MTBE was detected in ground water samples collected from wells MW-2, MW-3, and MW-4
<br /> utilizing EPA Method 8260 at concentrations as high as 69 µg/l, D1PE was detected in a sample
<br /> collected from MW-4 at a concentration of 7µg/l, TBA was detected from wells MW-7 and MW-8
<br /> at concentrations as high as 21 µg11 No other fuel oxygenates were detected above laboratory
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<br /> Advanced GcoEnviron mental,Inc
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