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i T Table 2 HISTORIC FLUID LEVELS AND SELECTED ANALYTICAL RESULTS February 1990 Through March 2005 Former 76 Station 6981 Date TOC Depth to LPH Ground- Change TPH-G TPPH Benzene Toluene Ethyl- Total MTBE MTBE Comments Sampled Elevation Water Thickness water in 8260B benzene Xylenes 8021B 8260B Elevation Elevation (feet) (feet) (feet) (feet) (feet) (µg/1) (110) (µg11) (11g/1) (µg/1) (µg/1) (µg/1) (µg11) MW-6 continued 07/26//95 11 43 4463 000 -3320 -097 ND<50 -- 055 1 9 ND<O 5 23 -- -- 10/25/95 1143 4546 000 -3403 -0 83 ND<50 -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 -- -- 01/24/96 1143 4249 000 -3106 2 97 ND<50 -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 -- 04/25/96 1143 3807 000 -2664 -- ND<50 -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<40 -- 07/24/96 1 1 43 3840 000 -2697 -033 ND<50 -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 0 -- 10/23/96 1143 40 11 000 -2868 -171 ND<50 - ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 0 - 01/20/97 1143 3669 000 -25 25 3 43 ND<50 -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 0 -- 07/16/97 1143 3403 000 -2260 -- ND<50 -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 0 - 10/15/97 1143 35 79 000 -2436 -176 ND<50 -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 0 ND<2 0 12/08/97 11 43 3565 000 -24 22 0 14 -- -- - -- -- -- -- 03/05/98 1143 31 62 000 -2019 4 03 ND<50 -- ND<O 50 ND<O 50 ND<O 50 ND<O 50 44 ND<2 0 05/27/98 1 1 43 2819 000 -1676 -- ND<50 -- ND<O 50 ND<O 50 ND<O 50 ND<O 50 ND<2 5 ND<2 0 07/21/98 1143 28 17 000 -1674 0 02 ND<50 ND<O 50 0 7 ND<O 50 0 7 ND<5 0 ND<2 0 10/14/98 1143 29 13 000 -1770 -096 ND<50 - ND<O 50 ND<O 50 ND<O 50 ND<O 50 ND<2 5 ND<2 0 01/25/99 1143 28 22 000 -1679 091 ND<50 -- ND<O 50 ND<O 50 ND<O 50 ND<O 50 ND<2 5 ND<2 0 04/19/99 1143 25 92 000 -1449 230 ND<50 -- ND<O 50 ND<O 50 ND<O 50 ND<O 50 ND<2 5 ND<2 0 07/15/99 1143 2720 000 -15 77 -128 ND<50 -- ND<O 50 ND<O 50 ND<O 50 ND<O 50 ND<2 5 ND<2 0 10/25/99 1143 28 83 000 -1740 -- ND<50 -- ND<O 50 ND<O 50 ND<O 50 074 ND<2 5 27 01/27/00 1143 2835 000 -1692 048 ND<50 -- ND<O 50 065 ND<O 50 1 6 ND<2 5 ND<2 0 06/26/00 1143 25 64 000 -14 21 2 71 ND<50 0 -- ND<O 500 0 671 ND<O 500 0 787 ND<5 0 ND<2 0 09/22/00 1143 28 10 000 -1667 -246 ND<50 -- ND<O 50 093 ND<O 50 1 1 ND<2 5 ND<2 0 12/26/00 1143 28 01 000 -1658 009 ND<50 0 __ ND<O 500 ND<O 500 ND<O 500 ND<O 500 ND<5 0 ND<2 0 03/07/01 1143 2775 0 00 -1632 026 ND<50 0 -- ND<O 50o ND<o 500 ND<o 500 ND<O 500 ND<5 0 ND<2 0 06/26/01 1143 28 70 000 -1727 -095 ND<50 -- ND<O 50 ND<O 50 ND<O 50 ND<O 50 ND<5 0 ND<2 0 6981 Page 13 of 36