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' 23 September 1998 <br />' AGE-NC Project No 95-0111 <br /> Page 2 of 4 J <br />' • EPA Method 8020 for volatile aromatic compounds (benzene, toluene, ethylbenzene and <br /> total xylenes BTEX) and <br /> • EPA Method 8260 and 8260m' for volatile organic compounds (VOVs) and oxygenated <br /> compounds, di-isopropyl ether (DIPS), ethyl tertiary butyl ether (ETBE), methyl tertiary <br /> butyl ether(MTBE), tertiary amyl methyl ether(TAME) tertiary butyl alcohol (TBA) <br /> 3.0. FINDINGS <br /> 3 1 GROUND WATER FLOW DIRECTION AND GRADIENT <br /> 1 � <br /> The relative elevation of ground water in each well was calculated by subtracting the ground wate"r <br /> depth from the surveyed casing elevation The depths to ground water and relative ground water <br />' elevations are tabulated in Table 1 All wells were surveyed relative to the casing of monitoring well <br /> MW-1, which had been assigned an arbitrary casing elevation of 20 feet <br /> lie The depth to ground water ranged from 6 19 feet below the well casing(bwc) in MW-4 to 9 46 feet <br /> bwc in MW-1 The relative ground water elevation at the site ranged from 11 03 feet in MW-3 to <br /> 9 56 feet in MW-6 The relative ground water elevation decreased an average of 0 12 feet at the site <br />' between 30 January and 18 June 1998 <br />' The inferred ground water flow direction at the site was towards the northeast Ground water <br /> gradient was approximately 0 04 ft/ft over the distance from the up gradient well to the south,edge <br /> of Grant Line Road The relative ground water elevation isocontours are depicted in Figure 3 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in samples collected from monitoring wells MW-1, MW-2, MW-4 and MW-5 ` <br /> at concentrations of 170 parts per billion (ppb, reported as micrograms per liter) 140 ppb, 120 ppb <br />' and 78 ppb, respectively <br /> TPH-d was detected in samples from wells MW-1, MW-2, MW-4, MW-S and MW-6 at <br />' concentrations of 110 ppb, 120 ppb and 54,000 ppb, 2,000 ppb and 55 ppb,respectively Laboratory <br /> notations for the ground water sample collected from'well MW-4 indicated the presence of an <br /> immiscible sheen <br /> Benzene was detected in samples collected from wells MW-1, MW-2, MW-4 and MW-5 a# <br /> Advanced GeoEnvironmental Inc <br /> r <br />