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16 August 1999 .� g , AGE-NC Project No 95-0111 IPage 2 of 4 I • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) by EPA Method 8015 Modified for each range of hydrocarbons, • Volatile aromatic compounds (benzene, toluene, ethylbenzene and total xylenes BTEX) by EPA Method 8020, and • Oxygenated compounds, di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary amyl methyl ether(TAME)tertiary butyl alcohol (TBA) by EPA Method 8260 Modified 3.0. FINDINGS Ground water was inferred to have a northerlyflow direction and was found to be locally impacted Y P by petroleum hydrocarbons and oxygenated fuel additives 3 3 GROUND WATER FLOW DIRECTION AND GRADIENT The relative ground water elevation in each well was calculated by subtracting the depth to ground ' water from the surveyed relative casing elevations The depths to ground water and relative ground water elevations are tabulated in Table I Ground water monitoring wells MW-1 through MW-6 were surveyed relative to the casing of monitoring well MW-1, which had been assigned an arbitrary I casing elevation of 20 feet The depth to ground water ranged from 6 36 feet below the well casing (bwc) in MW-4 to 9 57 feet bwc in MW-2 The inferred ground water flow direction at the site was towards the northeast, consistent with results obtained from previous quarterly monitoring events conducted The ground water gradient was approximately 0 005 ft/ft The relative ground water iso-elevation contours are depicted in Figure 3 3 4 ANALYTICAL RESULTS OF GROUND WATER SAMPLES I TPH-g was detected in samples collected from monitoring wells MW-1, MW-2 and MW-5 at concentrations of 100 micrograms per liter(,ug/1), 160 ,ug/l and 910 ,ug/l, respectively TPH-d was detected in samples from wells MW-2, MW-4, MW-5 and MW-6 at concentrations of 63 ,ug/1, 4,200, 250,000 yg/l and 150 ,ug/l, respectively IAdvanced GeoEnvironmentai Inc I "