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t � <br /> I <br /> 1 f <br /> I I ; <br /> 26 April 2004 <br /> AGE-NC Project No 97-0333 I <br /> ' Page 8 of 12 1 I <br /> 1 <br /> r 1 I I <br /> 4 5 1 Ground Water Elevation and Gradient <br /> 1 1 <br /> ' I <br /> The depths to ground water were measured at between 23 96 feet (MW-11A) and 26 21 feet <br /> (MW-9E)below the tops of the well casings on 17 November 2003, ground water elevations were <br /> calculated to be between 6 46 feet (MW-9E) and 7 95 feet (MW-4) above mean sea level (MSL) <br /> Based on current and previous monitoring data collected from wells MW-1 through MW-13,ground <br /> ' water elevation at the site generally increased an average 0 68 feet between the August 2003 and the <br /> November 20031 ground water monitoring events <br /> ` Ground water elevation data collected from multi-level wells MW-11, MW-12 and MW-13 on 17 <br /> November 2003 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 /> I <br /> The 17 November 2003 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 in Figures 4 through 7 <br /> 1 Y { <br /> I <br /> I <br /> 4'5 11 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-2, MW-6 and MW-7A (Figure 4), ground water gradients ranged from 0 003 ft/ft or less to <br /> greater than 0 008 fl/ft within the depression <br /> I <br /> I <br /> r, II <br /> 4!5 1 '2 Second Zone Aqui <br /> f i'Ground water elevation data collected,in the Second Zone Aquifer (58 to 92 feet bsg) inferred a <br /> I <br /> 'ground water flow direction, groundwater flow direction had'previously been, <br /> towards the north-northwest Ground water gradients were approximately 0 001 ft/ft or less near the <br /> site (Figure 5) I I <br /> I , <br /> � r <br /> I i ri I <br /> I r I r <br /> II <br /> Advanced GeoEnvironmental,Inc <br /> I Ir �I� �I 'II Il lr' it p+i I III If kl q1 <br />