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' 19 January 2005 <br /> . AGE-NC Project No 00-0769 <br />' Page 3of7 <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 /> Depth to ground water was between 26 83 feet (MW-8A) and 31 88 feet (MW-5E) below the tops <br />' of the well casings on 31 August 2004 Ground water elevations ranged from 16 69 feet (MW-4A) <br /> to 20 89 feet (MW-7D) below mean sea level (MSL) Ground water elevation data is presented in <br /> Table 1, contoured ground water elevation data Is presented in Figures 3 through 6 The elevation <br />' and gradient for each hydrogeologic unit is described below <br /> HU-1 <br />' Based ongr ound water elevation data collected in HU-1 Upper Zone (25 feet to 51 feet bsg), the <br /> • potentiometnc surface consists of a north-south trending ridge or high Ground water is inferred to <br /> tflow away from the ridge toward the west, east, and south at hydraulic gradients ranging between <br /> 0 003 foot/foot (ft/ft) and 0 01 ft/ft (Figure 3) <br />' HU-2 <br />' Based on ground water elevation data collected in HU-2 (112 feet to 125 feet bsg), the Inferred <br /> ground water flow on the western portion of the site is toward the south at gradients of less than <br /> 0 001 ft/ft, on the eastern portion of the site, the ground water flow direction rotates toward the ' <br />' southeast at hydraulic gradients of 0 002 ft/ft (Figure 4) <br /> } S <br /> HU-3 <br /> 1 Based on ground water elevation data collected in HU-3(140 feet to 160 feet bsg),the ground water <br /> flow direction is generally toward the east with an average gradient of approximately 0 001 ft/ft <br /> (Figure,5) <br /> HU-4 <br />' Based on ground water elevation data collected in HU-4 (160 feet to 175 feet bsg), the HU-4 <br /> potentiometric surface consists of a northeast-plunging ridge, ground water was inferred to be <br />' flowing outward from the ridge at hydraulic gradients between 0 03 ft/ft and 0 007 ft/ft (Figure 6) <br /> • <br />' Advanced CeoEnvironmental,Inc <br />