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. . 0 i Table 2 HISTORIC FLUID LEVELS AND SELECTED ANALYTICAL RESULTS i February 1990 Through December 2004 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 8260E Elevattan Elevation (feet) (feet) (feet) (feet) (feet) (µg11) (µg/1) 641) 6Lg11) (µg11) (µg/1) (µg11) (141) MW-6 continued 12/30/02 1143 3206 000 -20 63 050 -- NDG50 ND<O 50 ND<O 50 ND<O 50 ND<1 0 — ND<2 0 03/29/03 1143 31 16 000 -1973 090 -- ND<50 ND<O 50 071 ND<O 50 ND<1 0 NIX2 0 06/25/03 11143 3148 000 -2005 -032 -- ND<50 ND<O 50 N11<0 50 ND<O 50 ND<1 0 -- ND<2 0 09/24/03 1143 3282 000 -2139 -134 -- ND<50 ND<O 50 ND<0 50 ND<O 50 ND<1 0 -- ND<2 0 12/30/03 1143 3326 000 -2183 -044 -- ND<50 ND<0 50 1 1 ND<0 50 18 -- N>X2.0 03/09/04 1143 3241 000 -2098 085 ND<50 ND<O 50 ND<O 50 ND<O 50 15 ND<2 0 06/16/04 1143 3306 000 -2163 -065 — 55 ND<O 50 085 ND<O 50 12 -- ND<O 50 09/20/04 1143 3593 000 -2450 -287 ND<50 -- ND<O 50 ND<O 50 ND<O 50 ND 12/30/04 1143 3530 000 -2387 063 61 - 055 051 12 57 — ND<O 50 MW-7 (Screen Interval in feet:49.0-69.0) 04/16/92 — -- -- -- 07/30/92 -- -- — -- -- 950 — 320 19 57 25 10/21/92 -- — - -- -- 240 -- 35 26 19 32 — -- 01/13/93 -- -- -- -- -- 2400 -- 1000 95 35 120 — -- 04/26/93 1182 5108 000 -3926 — 500 -- 170 ND<2 5 ND<2 5 10 — -- 07/26/93 1182 5211 000 -4029 -103 3800 1200 59 92 140 -- -- 10120/93 11 82 5263 0 00 -4081 -052 3500 -- 690 34 44 53 — 01/17/94 1182 5010 000 -3828 253 15000 -- 4800 460 290 620 -- -- 04/25/94 1182 47 98 000 -36 16 -- 8300 — 3700 ND<25 400 130 -- -- 07/25/94 11 82 5046 000 -3864 -248 9300 -- 3300 54 420 120 - — 10/26/94 1182 5163 000 -3981 -1 17 3700 — 1900 11 240 ND<10 -- -- 01/25/95 1182 4885 000 -3703 278 250 -- 29 1 1 8 21 -- — 04/26/95 1182 44 33 000 -3251 452 97 -- 24 074 ND<O 5 067 -- — 07/26/95 1182 4533 000 -3356 -105 330 -- 17 61 23 62 -- 6981 Page 14 of 35