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- ' 15 November 2004 AGE-NC Project No 96-0229 IPage 4 of 6 I Ground water elevation data collected from wells MW-1, MW-2, MW-3, MW-13 (A-D), MW-14 (A-D), and MW-16 (A-E) on 01 June 2004 is depicted on cross section B-B' (Figure 3), by determining the difference between ground water elevations (dh) and dividing by the difference of ' the screen interval midpoints (dl), the vertical gradient between adjacent screen intervals was calculated Generally,nearly flat,very slight upward and downward vertical gradients were observed between the Second Water Zone, Second Confining Unit and Third Water Zone screen intervals of ' all the above wells (Figure 3), however, moderate to steep downward vertical gradients were generally observed in the First Confining Unit ' Ground water elevations were plotted on scaled site plans for the informal First Water Zone (between 15 and 45 feet, Figure 4) and Second Water Zone (between 70 and 95 feet, Figure 5) I3 1 1 First Water Zone Ground water elevation data collected in the First Water Zone(15 to 45 feet bsg) at the site inferred a net ground water flow towards the east-northeast at a hydraulic gradient of approximately 0 005 I ft/fl(Figure 4), off-site towards the north and northeast(wells MW-6 through MW-12),net ground water flow was oriented more towards the northeast at hydraulic gradients between 0 004 ft/ft and 0 006 ft/ft 3 1 2 Second Water Zone Ground water elevation data collected in the Second Water Zone (70 to 95 feet bsg) at the site and off-site (wells MW-5 and MW-6 through MW-12) inferred a net ground water flow direction towards the east-northeast at hydraulic gradients of approximately 0 003 ft/ft (Figure 5) 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES A total of forty-one ground water samples were submitted to Castle Analytical Laboratory(CAL), a DHS-certified laboratory in Atwater, California TPH-g was detected in eight water samples collected from wells MW-1, MW-2, MW-3, MW-6, MW-7, MW-9, MW-10B, and MW-16C at concentrations as high as 99,000 micrograms per liter (µg/1) in well MW-2 - Various BTEX constituents were detected in eight ground water samples collected from wells - MW-1, MW-2, MW-3, MW-6, MW-7, MW-9, MW-13A, and MW-13B at concentrations as high Advanced GeoEnvirenmental,Inc