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27 May 2004 <br /> AGE-NC Project No 96-0229 <br />' Page 4of7 <br />' the screen Interval midpoints (dl), the vertical gradient between adjacent screen intervals was <br /> calculated Generally,nearly flat,very slight upward and downward vertical gradients were observed <br /> between First Water Zone, Second Water Zone and Third Water Zone screen Intervals of all the <br />' above wells(Figure 3),however,moderate to steep downward vertical gradients were observed near <br /> wells MW-1/IVIW-2/MW-13 In the Second Confining Unit and near wells MW-3/MW-14 in First <br /> Confining Unit and Second Water Zone, a steep upward vertical gradient was observed near welts <br />' MW-1/MW-2/MW-13 in First Water Zone <br /> Ground water elevations were plotted on scaled site plans for the informal First Water Zone <br />' (between 15 and 45 feet, Figure 4) and Second Water Zone (between 70 and 95 feet, Figure 5) <br />' 3 1 1 First Water Zone <br /> Ground water elevation data collected from First Water Zone (15 to 45 feet bsg) at the site was <br /> inferred to be flowing towards the northeast at an approximate gradient of 0 006 ft/ft or less, or <br /> approximately 32 feet per mile (Figure 4) <br /> ti <br /> 3 12 Second Water Zone <br />' Ground water elevation data collected from Second Water Zone(70 to 95 feet bsg)Inferred an east- <br /> southeast ground water flow at the site at ground water gradients of 0 007 ft/ft or less (Figure 5) <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> A total of forty-one ground water samples were submitted to Castle Analytical Laboratory(CAL), <br /> a DHS-certified laboratory in Atwater, California <br />' TPH-g was detected in ten water samples collected from wells MW-1, MW-2, MW-3, MW-6, <br /> MW-7,MW-9,MW-1OB,MW-13D,MW-15A and MW-16C at concentrations as high as 100,000 <br /> 1 micrograms per liter (µg/1) in well MW-6 <br /> Various BTEX constituents were detected In twelve ground water samples collected from wells <br /> MW-1, MW-2, MW-3, MW-6, MW-7, MW-9, MW-13 (A-D), MW-15 (A-B) and MW-17A at <br /> concentrations as high as 20,000 µg/1 (xylene, MW-6), the highest benzene concentration was <br /> detected in sample MW-1 at a concentration of 5,200 µg/1 <br />' Advanced GeoEnviron mental,Inc <br />