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' 01 October 2004 " <br /> AGE-NC Project No 97-0333 <br /> ' Page7of11 <br /> Ground water elevation data collected from multi-level,wells MW-11, MW-12 and MW-13 on 31 <br /> ' March,2004 Is depicted on cross section F-F' (Figure 3) The vertical gradients between adjacent <br /> screen intervals are depicted on cross section F-F', the vertical gradient was calculated by <br /> ' determining the difference between adjacent screen Interval ground water elevations (dh) and <br /> dividing by the difference of the screen Interval midpoints(dl) Generally, a pronounced downward <br /> gradient was observed between the First Zone and the upper Second Zone at all three well locations, <br /> ' near neutral gradients were observed at all other locations <br /> The 31 March 2004 ground water elevation data collected from the Rainwater Car Wash site was <br /> ' plotted for the Informal First Zone, Second Zone, Third Zone and Primary Aquifer Zone <br /> hydrogeologic flow units, and are depicted on Figures 4 through 7 <br /> 3 5 1 1 First Zone Aquifer <br /> ' Ground water elevation data collected In the First Zone Aquifer (15 to 47 feet bsg) Inferred an <br /> Inward-radiating ground water flow towards a ground water depression in the area of wells EW-1, <br /> MW-6 and MW-7A(Figure 4),groundwater gradients were approximately 0 004 ft/ft or less within <br /> 10 the depression <br /> i <br /> 1 3 5 1 2 Second Zone Aquifer <br /> Ground water elevation data collected In the Second Zone Aquifer (58 to 92 feet bsg) Inferred a <br /> ' north-northwest to north-northeast ground water flow direction Ground water gradients were <br /> approximately 0 001 ft/ft or less near the site (Figure 5) <br /> 3 5 1 3 Third Zone Aquifer <br /> Ground water elevation data collected In the Third Zone Aquifer (lOZ to 120 feet bsg) Inferred a ' <br /> north to north-northeast ground water flow direction Ground water gradients were approximately <br /> ' 0 001 ft/ft or less near the site (Figure 6) <br /> 3 5 14 Pnrnga Aquifer Zone <br /> 1 <br /> Ground water elevation data collected in the Primary Aquifer Zone (128 to 150 feet bsg) inferred a <br /> ' northeast ground water flow direction Ground water gradients were approximately 0 001 ft/ft or less <br /> - -� --- near-the site(Figure 7) <br /> I ' Advanced GeoEnvironmental,Inc <br />