ARCHIVED REPORTS_XR0002215 - Laserfiche WebLink

Home Browse Search

' 27 March 2000 AGE-NC Project No 95-0111 ' Page 2 of 4 • 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 (DIPS), ethyl tertiary butyl ether (ETBE), methyl tertiary-butyl ether(MTBE),tertiary amyl methyl ether(TAME)tertiary butyl alcohol ' (TBA) by EPA Method 8260 Modified I3.0 FINDINGS ' Ground water was inferred to have a northerly flow direction and was found to be locally impacted by petroleum hydrocarbons and oxygenated fuel additives 3 1 GROUND WATER FLOW DIRECTION AND GRADIENT I . 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 1 Ground water monitoring wells MW-1 through MW-6 were surveyed relative to the casing top of monitoring well MW-1, which had been assigned an arbitrary casing elevation of 20 feet The depth to ground water ranged from 6 56 feet below the well casing (bwc) in MW-4 to 9 79 feet bwc in MW-1 The relative ground water elevation decreased 0 27 feet over the last quarter The inferred ground water flow direction at the site was towards the f north-northeast, consistent with results obtained from previous quarterly monitoring events conducted The ground water gradient was approximately 0 0075 ft/ft The relative ground water iso-elevation Icontours are depicted in Figure 3 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in samples collected from monitoring wells MW-1, MW-2, MW-4 and MW-5 at concentrations of 89 micrograms per liter (ggll), 56 ggll, 53 /,Ig/l and 160 µg/1, respectively TPH-d was detected in samples from wells MW-4, MW-5 and MW-7 at concentrations of 910 µg/l, 670,ugll and 67 µgll, respectively IAdvanced GeoEnvrronmental Inc i