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i 1 08 September 2005 AGE-NC Project No 97-0333 ' Page 7 of 11 ' 3 4 1 2 Second Zone Ground water elevation data collected in the Second Zone (58 to 92 feet bsg) inferred a northwest ground water flow direction Ground water gradient was approximately 0 001 ft/ft or less on the site (Figure 5) 34 13 Third Zone Ground water elevation data collected in the Third Zone(102 to 120 feet bsg) inferred a northwest ground water flow direction Ground water gradient was approximately 0 002 ft/ft or less on the site t (Figure 6) 3 4 1 4 PrimAquifer Zone ' Ground water elevation data collected in the Prim Aquifer Zone 128 to 150 feet bsg) inferred a ' �' q ( g) northwest ground water flow direction Ground water gradient was approximately 0 001 ft/ft or less Ile on the site (Figure 7) ' 3 4 2 Laboratory Results of Ground Water Samples ' During the March 2005 sampling event, TPH-g was detected in ground water samples MW-1, MW-2,MW-3,MW-6,MW-7(A-F),MW-8(A-F),MW-913,MW-1 O(B-D),MW-11(C-D),MW-12 (A-D) and MW-13 (C-D) at concentrations as high as 140,000 µg/1 (MW-7A) BTEX constituents were detected in ground water samples MW-1,MW-2, MW-3, MW-6, MW-7 (A-F) and MW-8A at maximum concentrations of 7,800 µg11 benzene, 44,000 Vg/1 toluene, 5,800 ' µg/1 ethylbenzene and30,OOO µg/1 xylenes from well MW-7A MTBE(utilizing EPA Method 826013)was detected in ground water samples MW-1,MW-2,MW-3, MW-6, MW-7 (A, C and E) and MW-12B at concentrations as high as 5,600 µg/1 (MW-2), 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-3,MW-6 and MW-7A at concentrations as high as 200 µg/1 (MW-7A), 1,2-DCA was detected in ground water samples MW-7C, MW-8 IIle (B-C), MW-9B and MW-10(B-C) at concentrations as high as 8 1 µg/1 (MW-1OB) f Advanced GeoEnvironmental,Inc 1 '