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r - <br /> F! <br /> 02 April 1998 <br /> . AGE-NC Project No 95-0111 <br /> - Page 2 of 4 <br /> • ,Volatile aromatic compounds (benzene, toluene, ethylbenzene and total xylenes BTE&X) <br /> Iby EPA Method 8020, and <br /> • Methyl tertiary-butyl ether(MTBE),tertiary butyl alcohol,(TBA),di-isopropyl ether(DIPS), <br />' ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME)by EPA Method <br /> 8260 <br /> I , <br /> 3.0. FINDINGS <br />' 3 1 GROUND WATER FLOW DIRECTION AND GRADIENT <br />' The relative elevation of ground water in each well was calculated by'subtracting the ground water <br /> depth from the surveyed casing elevation The depths to ground water and relative ground water <br /> elevations are tabulated in Table I -Relative Ground Water Elevation Data All wells were surveyed <br />' relative to the casing of monitoring well MW-1, which had been assigned an arbitrary casing <br /> elevation of 20 feet <br />' The depth to ground water ranged from 6 85 feet below the well casing (bwc) in MW-5 to 9 20 feet <br /> bwc in MW-1 and MW-3 The relative ground water elevation at the site ranged from 11 06 feet in <br />' MW-2 to 9 99 feet in MW-6 The relative ground water elevation increased an average of 0 48 feet <br /> at the site between November 1997 and January 1998 The overall ground water flow direction at <br /> the site was toward the northeast, but may be toward the southwest in the area of MW-2 Ground <br />' water gradient was approximately 0 005 ft/ft over the distance from the up gradient to the down <br /> gradient monitoring wells Ground water eleN ation isocontours are depicted in Figure 3 - Relative <br /> Ground Water Elevation <br /> 1 ' <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES ' <br />' TPH- was detected in samples collected from monitoring wells MW-1 MW-? MW-4 and MW-5 <br /> g P g <br /> at concentrations of 71 micrograms per liter (fig/i, approximately equivalent to parts per billion <br />' ppb), 68 ppb, 92 ppb and 110 ppb, respectively TPH-d was detected in samples from wells MW-2, <br /> MW-4 and MW-5 at concentrations of 64 ppb, 3,400 ppb and 11,000 ppb, respectively Laboratory <br /> notations for the ground water sample collected from wells MW-4 and MW-5 indicated the presence <br /> of an immiscible sheen <br />' Benzene was detected in samples coilected from wells MW-1, MW-2, MW-4 and MW-5 at <br /> . concentrations as high as 14 ppb, toluene was detected in MW-4 and MW-5 at concentrations of 1 5 <br /> 1 Advanced GeoEnviron mental Inc <br />