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n l <br /> �, µ1 <br /> ,19 January 2004 <br /> AGE-NC Project No 96-0235 <br /> IPage 3 of 8 , <br /> 3.0. FINDINGS <br /> I , <br /> The hydrocarbon-impact to ground water was quantified by laboratory analysis of the ground water <br /> `samples Groundwater elevation and gradient was determined by utilizing data collected from tlae,` <br /> 1 ry <br /> 'field <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' September 2003 ' <br /> , <br /> 'Depths-to groundwater ranged from 17 77 feet to 20 83 feet,below the tops of the well casings, <br />' ground water was within the screened intervals of the shallow wells,but was approximately 12 feet <br /> above the screened Interval of intermediate wells MW-3 and EW-2 and between 19 2 and 46 2 feet <br /> above the screened'intervals of the deep wells <br /> The elevation of ground water In each well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevations (Table 1) Ground water elevations at the site ranged from <br />' 12 47 feet (MW-4) to 14 22 feet (MW-2)below mean sea level (MSL) The average ground water <br /> elevation at the site was approximately 13 03 feet below MSL The average ground water elevation ' <br /> in the wells decreased by approximately 0 85 feet since the June 2003 ground water monitoring <br /> event <br /> Figure 3 and Figure 4 Illustrate the ground water potentiometric surface based on the shallow- and v <br /> deep-screened data sets Near the former UST cluster, the shallow-screened data delineate a radial 3 r <br /> ground water flow pattern, with a net flow towards the east at a gradient of 0 004 ft/ft, the deep- <br />' r screened data delineated a ground water flow direction toward the east-northeast'at,a gradient of <br /> .10 001 ft/ft Near the former UST No 3 excavation ground water flow direction of the shallow- <br /> screened level was inferred to be towards the east-northeast at a gradient of 0 005 ft/ft,ground water <br /> flow direction at the deep-screened_level was inferred to be toward the south-southwest at a gradient ; <br />' of 0 015 ft/ft <br />' November 2003 ; <br /> Depths to ground water in November ranged from,l 8 15 feet to 21 04 feet below the tops of the well <br />' casings,ground water was within the screened intervals of the shallow wells,but was approximately <br /> 10 feet above the screened interval of intermediate wells MW-3 and EW-2 and between 19 and <br /> 46 feet above the screened intervals of the deep wells ; <br /> 1 T <br /> r <br /> Advanced GeoEnvironmental,Inc <br /> ' 3 , <br /> , I <br />