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I n <br /> r <br /> 1 1 l i I , ' i + • r <br /> r f <br />! 06 December 1999 <br /> AGE-NC Project No 95-0111 j <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 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 /> 1 � <br /> The relative ground water elevation in each well was calculated by subtracting the depth to ground <br /> water from the surveyed relative casing elevations The depths to ground water andrelative ground <br /> water elevations are tabulated in Table 1 Ground water monitoring wells MW-1 through MW-6 <br /> were surveyed relative to the casing of monitoring well MW-1,which had been assigned an arbitrary <br /> casing elevation of 20 feet The depth to ground water ranged from 6 28 feet below the well casing <br /> (bwc) in MW-4 to 9 51 feet bwc in MW-1 The relative ground elevation increased 0 1 feet over the <br /> last quarter The inferred ground water flow direction at the site was towards the north-northeast, <br /> consistent with results obtained from previous quarterly monitoring events conducted <br /> The ground water gradient was approximately 0 005 ft/ft The relative ground water iso-elevation <br /> contours are depicted in Figure 3 <br /> I , <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected In samples collected from monitoring wells MW-1, MW-2, MW4 and MW-5 <br /> at concentrations of 52 micrograms per liter (µg/1), 190,ug/l, 270 µg/l and'230 ,ug/l, respectively <br /> TPH-d was detected in samples from wells MW-2, MW-4, MW-5 and MW-7 at concentrations of <br /> 61 µg/l, 1,400,ug/l, 20,000,ug/l and 150 Fig/l, respectively i <br /> Advanced GeoEnvironmental Inc <br /> r it <br />