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22 August 2005 <br /> AGE-NC Project No 99-0559 <br /> Page 3 of 7 <br /> of Health Services-certified laboratory, for analysis The ground water samples were analyzed for <br /> the following <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, and <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX) and the fuel additives tertiary butanol <br /> (TBA), di-Isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl <br /> ether (TAME), methyl tertiary-butyl ether (MTBE), 1,2-dlbromoethane (EDB) and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevations were determined by subtracting the measured depths to ground water from <br /> the surveyed casing elevations Ground water flow directions were determined by contouring the <br /> water elevations on a scaled site plan Contaminant impact to ground water was assessed by <br /> laboratory analysis <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each monitoring well at the time of the monitoring event was <br /> calculated by subtracting the depth to ground water from the surveyed casing elevation, current and <br /> historical ground water elevation results are provided In Table 1 Each ground water elevation is <br /> grouped according to the HU on the assumption that the elevation will reflect hydrostatic conditions <br /> within the designated HUs <br /> HU1 and HU2 The depth to ground water In monitoring wells MW-1 through MW-4 and the depth <br /> to ground water measured In wells MW-5A through MW-7A ranged between 54 06 and 55 02 feet <br /> below the top of casing (btoc) However,the depth to ground water(54 64 feet) at well MW-2 was <br /> affected by the presence of free product, the depth was recalculated (54 58 feet) utilizing the <br /> measured thickness of free product In well MW-2 <br /> DW= Dm - (tg * dVdJ <br /> Dw= Corrected depth to water <br /> Dm = Measured depth to water <br /> tg= Total thickness of free product (-0 08 foot) <br /> Advanced CeoEavironmentsl,Inc <br />