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31 July 2000 <br /> AGE-NC Project No 98-0426 <br /> IPage 2 of 4 - <br /> • Total petroleum hydrocarbons quantified as�gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015-modified, <br /> " Volatile aromatic compounds benzene, toluene, ethylbenzene and xylenes (BTE&X) in " <br /> accordance with EPA Method 8020, and <br /> • FueI oxygenates methyl tertiary-butyl ether (MTBE) di-isopropyl ether (DIPE), ethyl <br /> Itertiary-butyl ether (ETBE), tertiary-amyl methyl ether(TAME), and tertiary butanol (TBA) <br /> in accordance with EPA Method 8260B <br /> 3 <br /> 3.0. FINDINGS <br /> Ground water flow direction and gradient were inferred from data collected in the field, the impact <br /> to ground water resulting from the unauthorized release of fuel hydrocarbons was quantified by the <br /> laboratory data,obtained from the ground water samples <br /> lie 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT _ <br /> The relative elevation of ground water in each well was calculated by subtracting the depth to ground <br /> water from the surveyed relative casing elevations (Table 1) Depths to ground water ranged from <br /> 20 06 feet to 21 20 feet as measured from the top of the well casings Relative ground water <br /> I ' elevations at the site ranged from 78 80 feet in MW 1 to 78 96 in MW2 The relative ground water <br /> elevation at the site increased an average of 2 41 feet between the January 2000 and April 2000 <br /> monitoring events Ground water was within the screened intervals in all three wells The ground <br /> I water gradient was calculated to be 0 005 ft/ft with a flow direction of N 18° E(north-northeast) The <br /> ground water contours are depicted on Figure 3 , <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was not detected in MW1 TPH-g was detected in the water samples collected from MW2 <br /> and MW3 at concentrations of 930 pg/1 and 640 ug/I respectively <br /> IBTEX compounds were not detected in samples collected from MW i Ethylbenzene and xylenes <br /> were detected in MW2 at concentrations of 17 ppb and 27 ppb, respectively All BTEX compounds <br /> were detected in the water sample from MW3 at concentrations of ranging from i3 �tg/l of toluene <br /> to 1,300 ug/l of ethylbenzene, Benzene was detected in MW3 at 820 ,ug/l <br /> I - <br /> Advanced GcoEn%iron mental,Inc <br /> I ` <br />