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r <br /> k , <br />' 23 December 2005 r <br /> . AGE-NC Project No 00-0769 <br />' Page 3 of 8 <br /> S � <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br />' Method 8015 Modified, and <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and the fuel additives methyl <br /> I tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME),tertiary-butyl alcohol(TBA), 1,2-dibromoethane(EDB), <br /> 1,2-dichloroethane (1,2-DCA), ethanol, and methanol in accordance with EPA Method <br />' 8260B - <br />' 3.0, FINDINGS <br />' Ground water elevation,flow direction,and gradient were inferred from field data The hydrocarbon <br /> impact to ground water was quantified by laboratory analysis of ground water samples <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> leDepth to ground water was between 24 77 feet(MW-8A) and 30 02 feet (MW-5E)below the tops <br /> of the well casings on 08 September 2005 Ground water elevations ranged from 13 16 feet <br /> (MW-8A) to 17 05 feet (MW-5E) below mean sea level (MSL) Ground water elevation data is <br />' presented in Table 1,contoured ground water elevation data is presented in Figures 3 through 6 The <br /> elevation and gradient for each hydrogeologic unit is described below <br /> 3 1 1 Hydrogeologic Unit 1 r <br />' "Based on ground water elevation data collected in HU-1 Upper Zone (25 feet to 51 feet bsg), the ' <br /> potentiometric surface is characterized by a north-south trending ridge, inferred ground water flow <br /> directions are predominantly east and southwest Hydraulic gradients onsite range between <br /> 0 002 foot per foot (ft/ft) and 0 004 ft/ft (Figure 3) <br /> k ' i <br /> 1 <br /> I3 12 Hydrogeologic Unit 2 <br />' Based on ground water elevation data collected; In HU-2 (112 feet to 125 feet bsg), the <br /> potentlometric surface is characterized by a north-south trending ridge, inferred ground water flow <br /> directions are predominantly east and southwest Hydraulic gradients range between 0 008 ft/ft <br />' towards the southwest and 0 002 ft/ft towards the south and southeast (Figure 4) <br /> rAdvanced GeoEnvironmental,Inc <br />