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A <br /> s <br /> 3 <br /> • 10 December 1998 <br /> AGE-NC Project No 95-0111 <br /> Page 2 of 4 <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) by <br /> EPA Method 8015 modified for each range of hydrocarbons, <br />' Volatile aromatic compounds(benzene,toluene, ethylbenzene and total xylenes BTEX) by <br /> EPA Method 8020, and <br />' Oxygenated compounds,di-isopropyl ether(RIPE),ethyl tertiary butyl ether(ETBE),methyl <br /> tertiary-butyl ether(MTBE),tertiary amyl methyl ether(TAME)tertiary butyl alcohol (TBA) <br /> by EPA Method 8260 modified <br /> 3.0. FINDINGS <br /> 1 <br /> Ground water was inferred to have a northerly flow direction and was found to be locally impacted <br />' by petroleum hydrocarbons and oxygenated fuel additives <br />' 3 1 GROUND WATER FLOW DIRECTION AND GRADIENT <br /> The relative ground water elevation in each well was calculated by subtracting the ground water <br />' depth from the surveyed relative casing elevations The depths to ground water and relative ground <br /> water elevations are tabulated in Table 1 All wells were surveyed relative to the casing of <br /> I monitoring well MW-1,which had been assigned an arbitrary casing elevation of 20 feet The depth <br /> to ground water ranged from 6 32 feet below the well casing (bwc) in MW-4 to 9 57 feet bwc in <br /> MW-1 <br />' The relative ground water elevation at the site ranged from 10 91 feet in MW-3 to 9 56 feet in MW- <br /> 6 The relative ground water elevation decreased an average of 0 1 foot between June and September <br /> 1998 - <br /> The inferred ground water flow direction at the site was towards the northeast, consistent with results <br />' obtained from 10 quarterly monitoring events conducted since July 1995 The ground water gradient <br /> was approximately 0 005 ft/ft oX 26 feet per mule, over the distance from the up gradient well (MW- <br /> 3)to the north edge of Grant Line Road (MW-6) The relative ground water elevation isocontours <br />' 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-4 and MW-5 at <br /> 1 <br /> Advanced GeoEnvironmental Inc <br /> 1 <br />