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r03 March 2005 <br /> r AGE-NC Project No 98-0452 <br />' Page 3 of 6 <br />' 3.0. FINDINGS <br /> Ground water elevation, gradient and flow direction were calculated from field data The Impact to <br />' ground water was assessed by laboratory analysis of the ground water samples <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> I from the surveyed well head elevations(Table 1),ground water flow direction and hydraulic gradient <br /> were determined from the elevation data The depths to ground water, calculated ground water <br /> elevations, ground water flow directions and hydraulic gradients for the second, third and fourth <br />' quarter monitoring events are presented below <br /> 3 1 1 Second Quarter (28 June 2004) <br /> Depths to ground water ranged from 3 84 feet to 5 76 feet below the tops of the well casings Ground <br /> water elevations at the site ranged from 1 11 feet(MW-4)to 143 feet(MW-6)above mean sea level <br /> (MSL) The ground water gradient was calculated to be approximately 0 002 foot/foot (ft/ft) with <br /> a trough-like flow toward the southwest (Figure 3) Average depth to ground water was 4 72 feet <br />' below the tops of the well casings and dropped an average of 0 14 foot between the March and June <br /> 2004 monitoring events <br /> 3 12 Third Quarter(30 September 2004) <br /> Depths to ground water for the September 2004 monitoring event ranged from 4 50 feet to 6 38 feet <br /> below the tops of the well casings Ground water elevations at the site ranged from 0 26 feet(MW-4) <br />' to 0 77 feet(MW-6) above mean sea level (MSL) Ground water flow was radially inward towards <br /> a west-trending, trough in the potentiometric surface (Figure 4), ground water gradients ranged <br /> between 0 0016 ft/ft near the former UST location and 0 0035 ft/ft near the AST locations Average <br />' depth to ground water was 5 54 feet below the tops of the well casings and dropped an average of <br /> 0 82 foot between the June and September 2004 monitoring events <br />' 3 1 3 Fourth Quarter(16 December 2004) <br /> IDepths to ground water for the December 2004 monitoring event ranged from 4 40 feet to 6 09 feet <br /> below the tops of the well casings Ground water elevations at the site ranged from 0 45 feet(MW-5) <br /> Advanced GeoEnvironmental,Inc <br />