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1 y e 1 ' 02 March 2005 AGE-NC Project No 97-0333 ' Page 7 of 10 3 4 1 2 Second Zone Aaulfer Ground water elevation data collected 1n the Second Zone Aquifer (58 to 92 feet bsg) inferred a ' northwest ground water flow direction Ground water gradient was approximately 0 001 ft/fl or less ori the site (Figure,5) I , I 3 4 1 3 Third Zone Aquifer S b Ground water elevation data collected in the Third Zone Aquifer (102 to 120 feet bsg) inferred a northwest ground water flow direction Ground water gradient was approximately 0 001 ft/ft or less on the site'(Figure 6) 3 4 1 4 Pnmary Aquifer Zone ' Ground water elevation data collected In the Primary Aquifer Zone (128 to 150 feet bsg) inferred a • northwest ground water flow direction Ground water gradient was approximately 0 001 ft/ft or less ' on the site (Figure 7) ' 3 4 2 Laboratory Results of Ground Water Samples r ' During th& December 2004 sampling event, TPH-g was detected in ground water samples MW-2 through MW-4,MW-6,MW-7(A-F),MW-8(B-D),MW-9A,MW-10(B-D),MW-11(C-D),MW-12 (A-D) and MW-13C at concentrations as high as 15,000 gg/l (MW-3) ' BTEX constituents were detected In ground water samples MW-2, MW-6 and MW-7 (A-F) at maximum,concentrations of 560 µg/1 benzene and 1880 gg/l toluene from well MW-7E, and 120 ' gg/l ethylbenzene and 900 µg/1 xylenes from well MW-6 MTBE(utilizing EPA Method 8260B)was detected in ground water samples MW-2,MW-3,MW-5, ' MW-6, MW-7 (A-F) and MW-12B at concentrations as high as 4,300 µg/1 (MW-7E), iso- concentration maps displaying the estimated extent of dissolved MTBE In First Zone and Second Zone aquifers are depicted on Figures 8 and 9 ' TAME was detected In ground water samples MW-2,MW-6 and MW-7A at concentrations as high as 42 pg/l (MW-7A), 1,2-DCA was detected in ground water samples MW-7 (B-E),MW-8 (B-D), ' MW-9B and MW-10(B-C) at concentrations as high as 21 µg/l (MW-IOB) Advanced GeoEnvnronmentnl,Inc