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7 r w 4 30 November 2005 , . AGE-NC Project No 00-0769 ' Page 3 of 8 r L i 3.0. FINDINGS Ground water elevation,flow direction,and gradient were Inferred from field data The hydrocarbon Impact to ground water was quantified by laboratory analysis of ground water samples ' 3 1 GROUND WATER ELEVATION AND GRADIENT Depth to ground water was between 24 14 feet (MW-8A) and 28 52 feet(MW-5E) below the tops of the well casings on 19 May 2005 Ground water elevations ranged from 12 52 feet(MW-5A) to 15 55 feet (MW-5E) below mean sea level (MSL) Ground water elevation data is presented in Table 1, contoured ground water elevation data is presented in Figures 3 through 6 The elevation ' and gradient for each hydrogeologic unit is described below K 3 1 1 Hydrogeologic Unit 1 Based on ground water elevation data collected in HU-1 Upper Zone (25 feet to 51 feet bsg), the I0potentiometric surface slopes uniformly to the east Ground water is inferred to flow along this plane in an easterly direction at a hydraulic gradient of 0 003 foot per foot'(ft/ft)across the majority of the site, and at a hydraulic gradient of 0 002 ft/ft across the northern portion (Figure 3) 3 1 2 Hydrogeologic Unit 2 1 Based on ground water elevation data collected in HU-2 (I t2 feet to 125 feet bsg), the potentiometnc surface 15 characterized by a north-south trending ridge,causing the inferred ground water flow direction to range from west, to south, to east at gradient of 0 002 ft/ft to 0 003 ft/A (Figure 4) , 3 13 , Hydrogeologic Unit.3 Based on ground water elevation data collected in HU-34140 feet to 160 feet bsg),the ground water flow direction is generally towards the southwest and southeast at gradients between approximately 0 002 ft/ft and 0 006 ft/ft (Figure 5) c 1 1 1 r - Advanced GeoEnvtronmentai,Inc < f J � 3 i , 1