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Table 2 HISTORIC FLUID LEVELS AND SELECTED ANALYTICAL RESULTS February 1990 Through June 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 8260E benzene Xylenes 8021B 8260B Elevation Elevation (feet) (feet) (feet) (feet) (feet) (141) (µg/l) (µg11) (11g/1) (µg/1) (µg/1) (µg/l) (µg/1) MW-2 contunucd 07/30/92 - - - -- -- -- -- -- -- - -- Dry 10/21/92 -- -- -- -- -- -- -- - -- -- -- - Dry 01/13/93 -- - - -- - - -- -- - -- -- -- Dry 04/26/93 11 56 5072 000 -3916 -- 43000 -- 8000 ND<125 ND<125 ND<125 -- -- 07/26/93 11 56 51 72 000 -4016 -100 18000 -- 2900 47 38 90 -- - 10/20/93 11 56 5226 000 -4070 -054 12000 -- 2400 52 ND<20 60 -- 01/17/94 11 56 4974 000 -38 18 2 52 14000 -- 1800 31 29 120 -- - 04/25/94 11 56 4761 000 -3605 2 13 21000 -- 8000 240 93 220 -- -- 07/25/94 1156 5007 -- -3851 -246 -- -- __ __ __ __ Inaccessible 10/26194 11 56 5125 000 -39 69 -1 18 24000 -- 11000 3100 96 3200 --01/25/95 11 56 4849 000 -3693 2 76 8600 -- 4100 94 35 130 - 04/26/95 11 56 43 88 000 -3232 4 61 11000 -- 5300 460 74 530 -- -- 07/26/95 11 56 4495 000 -3339 -1 07 3300 -- 640 26 ND<12 5 13 -- -- 10/25/95 11 56 4584 000 -3428 -0 89 01/24/96 11 56 43 05 000 -3149 279 2100 -- 510 29 ND<10 11 -- -- 04/25/96 1156 3822 000 -2666 4 83 07/24/96 11 56 3860 000 -2704 -038 1300 -- 470 110 16 75 36 - 10/23/96 11 56 4043 -28 87 -1 83 -- __ __ __ __ _ Sampled Semi-annually 01/20/97 11 56 3693 000 -2537 3 50 250 -- 72 13 4 5 16 18 - 07/16/97 11 56 3424 000 -2268 269 16000 -- 3900 220 180 390 ND<250 -- 10/15/97 11 56 3608 000 -24 52 -1 84 12000 - 3500 200 170 640 ND<500 120 12/08/97 11 56 36 14 000 -2458 -0 Ob 03/05/98 11 56 3268 000 -21 12 346 10000 -- 1900 ND<50 150 ISO 280 300 05/27/98 11 56 2931 000 -1775 337 8600 -- 1400 18 56 65 47 270 6981 Page 4 of 37