ARCHIVED REPORTS_XR0006950 - Laserfiche WebLink

Home Browse Search

1 . 12 December 2005 AGE-NC Project No 97-0333 ' Page 7 of 11 ' 34 12 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 (Figure 6) 34 14 Primary 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 0006 ft/ft or less � . on the site (Figure 7) 3 4 2 Laboratory Results of Ground Water Samples During the July 2005 sampling event,TPH-g was detected in ground water samples MW-2,MW-3, MW-6, MW-7(A-F),MW-8(A-F),MW-9(B-C), MW-10(B-D),MW-11(C-D),MW42 (A-D)and MW-13 (C-D)at concentrations as high as 190,000 gg/1 (MW-2) ' BTEX constituents were detected in ground water samples MW-2,MW-3,MW-6,MW-7(A-F)and MW-8A at maximum concentrations of 5,800 µg/1 benzene(MW-6), 17,000 gg/l toluene(MW-2), ' 4,000 gg/l ethylbenzene (MW-2) and 18,700 µg/1 xylenes (MW-2) MTBE(utilizing EPA Method 8260B)was detected in ground water samples MW-1,MW-2,MW-3, t MW-6, MW-7(A, B, C, E and F), MW-8F, MW-11 (B-C) and MW-12B at concentrations as high as 69,000 gg/l(MW-3),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-7 (A-F) at concentrations as high as 3,700 gg/1 (MW-3), 1,2-DCA was detected in ground water samples ' MW-2, MW-3, MW-6, MW-7 (A-E) , MW-8 (B-D), MW-9B, MW-10(B-C) and MW-11C at concentrations as high as 140 Vg/1 (MW-6) Advanced GeoEnvironmental,Inc 1