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Table 2 HISTORIC FLUID LEVELS AND SELECTED ANALYTICAL RESULTS February 1990 Through June 2005 Former 76 Station 6981 Date TQC Depth to LPH Ground- Change TPH-G TPPH Benzene Toluene Ethyl- Total MTBE MTBE Comments Sampled Elevation Water Thickness water in 8260B benzene Xylenes 9021B 8260B Elevation Elevation (feet) (feet) (feet) (feet) (feet) (µg/1) (41) (µg/1) (lig/l) (µg/l) (µg/1) (µg/1) (pg/1) MW-6 continued 09/22/00 1143 28 10 000 -1667 -246 ND<50 -- ND<0 50 093 ND<0 50 1 1 ND<2 5 ND<2 0 12/26/00 11 43 2801 000 -1658 009 ND<50 0 __ ND<a 500 ND<0 500 Ntxo 500 NDm 500 ND<5 0 ND<2 0 03/07/01 1143 2775 000 -1632 026 ND<50 0 -- ND<0 500 ND<o 500 ND<0 500 ND<0 500 ND<5 0 ND<2 0 06/26/01 11 43 2870 000 -1727 -095 ND<50 -- ND<0 50 ND<0 50 ND<0 50 ND<0 50 ND<5 0 ND<2 0 09/12/01 1143 3059 000 -19 16 -1 89 ND<50 - ND<0 50 ND<0 50 ND<0 50 ND<0 50 ND<5 0 ND<2 0 12/12/01 1143 3086 000 -1943 -027 ND<50 - ND<0 50 1 2 ND<0 50 1 7 ND<5 0 ND<1 0 03/20/02 11 43 2967 000 -1824 1 19 ND<50 ND<0 50 ND<0 50 ND<0 50 ND<0 50 ND<5 0 ND<2 0 06/06/02 1143 30 10 000 -1867 -043 -- ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 -- ND<2 0 09/30/02 1143 32 56 000 -21 13 -246 -- 190 76 10 6 2 27 -- ND<2 0 12/30/02 1143 3206 000 -2063 0 50 -- ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 -- ND<2 0 03/29/03 1143 31 16 000 -1973 090 -- ND<50 ND<0 50 071 ND<0 50 ND<1 0 -- ND<2 0 06/25/03 11 43 3148 000 -2005 -032 -- ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 -- ND<2 0 09/24/03 1143 3282 000 -21 39 -134 -- ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 -- ND<2 0 12/30/03 1143 3326 000 -21 83 -044 -- ND<50 ND<0 50 1 1 ND<0 50 1 8 - ND<2 0 03/09/04 11 43 3241 000 -2098 085 -- ND<50 ND<0 50 ND<0 50 ND<0 50 1 5 -- ND<2 0 06/16/04 1143 3306 000 -2163 -065 -- 55 ND<0 50 0 85 ND<0 50 1 2 -- ND<0 50 09/20/04 1143 3593 000 -24 50 -287 ND<50 -- ND<0 50 ND<0 50 ND<0 50 ND<1 0 -- ND<0 50 12/30/04 1143 3530 000 -2387 063 61 -- 055 051 1 2 5 7 ND<0 50 03/24/05 1143 3391 000 -2248 139 ND<50 -- ND<0 50 054 ND<0 50 ND<1 0 -- ND<0 50 06/28/05 1143 3251 000 -2108 1 40 ND<50 -- ND<0 50 ND<0 50 ND<0 50 ND<l 0 - ND<0 50 MSV-7 (Screen Interval in feet 49 0-69 0) 04/16/92 -- -- -- -- 07l30/92 -- -- -- - -- 950 - 320 19 5 7 25 -- -- 10/21/92 -- -- - -- -- 240 -- 35 2 6 1 9 3 2 -- 6981 Page 14 of 37