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r 1 <br /> i <br /> 1 1 Y 1 <br /> r 14 January 2005 <br /> AGE-NC Protect No 00-0769 <br /> r Page 3 of 7 <br /> 1, <br /> 1 S' 1, <br /> L 111 4 <br /> (MW-SA) to 19 02 feet (MW-7D) below mean sea level (MSL) Ground water elevation data is " <br /> rpresented 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 /> r <br /> 1 <br /> HU-1 <br /> N1 IVI Y <br /> r Based on ground water elevation data collected in HU-1 Upper Zone (25 feet to 51 feet bsg), the <br /> 1 ground water flow is generally toward the east and east-southeast under an average gradient of <br /> approximately 0 003 foot/foot (ft/ft Figure 3) <br /> I <br /> r HU-2 <br /> 1 <br /> r Based on ground water elevation data collected in HU-2(112 feet to 125 feet bsg), except data from <br /> single level wells MW-2A and MW-3A, which were drowned, the ground water at the central <br /> portion of the site (MW-2A) was flowing southeast toward well MW-9, under a gradient of <br /> r approximately 0 001 ft/ft Ground water on the eastern portion of the site was generally flowing <br /> toward the northeast, and ground water on the western portion of the site was flowing toward the <br /> ,1 <br /> southeast (Figure 4) <br /> HU-3 <br /> rBased on ground water elevation data collected in HU-3(140 feet to 160 feet bsg),the ground water <br /> Pow on the western and central portions of the site is generally inward toward a depression in the <br /> vicinity of well MW-5C under a gradient of approximately 0 001 ft/ft Ground water on the eastern <br /> ru portion of the site was generally flowing to the east (Figure 5) 4 ' <br /> s J <br /> HU-4 <br /> I ' <br /> r Based on ground water elevation data collected in HU-4(160 feet to'175 feet bsg),the ground'water <br /> r _ flow,direction was radially outward from a northeast-trending ridge under an approximate gradient <br /> of 0 0144 ft/ft to 0 009 ft/ft (Figure 6) <br /> r3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> During the May 2004 sampling event, ground water samples from 31 monitoring points were <br /> r collected from HU-1 through HU-5 and submitted for laboratory analysis for the constituents listed <br /> m Section 2 2 Analytical Ilab oratory results are summarized in Tables 2 through 5 The lateral extent <br /> rof petroleum hydrocarbon-impacted ground water for HU-1 through HU-5 is illustrated on Figures 7 <br /> . through 11, respectively i <br /> 1 <br /> r - <br /> 1 <br /> Advanced GeoEnvironmental,inc <br /> 1 <br /> 1 r <br /> r1 <br />