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Table 2 HISTORIC FLUID LEVELS AND SELECTED ANALYTICAL RESULTS February 1990 Through December 2004 Former 76 Station 6981 Date TOC Depth to LPH Ground- Change TPH-G TPPH Benzene Toluene Ethyl- Total MTBE MT13E Comments Sampled Elevation Water Thickness water in 8260E benzene Xylenes 80218 8260E Elevation Elevation (fed) (feet) (feet) (feet) (feet) (µg/1) (µg11) (41) (µg11) (110) (µg11) (µg/1) (µ8l1) MW-2 continued 01/13/93 -- -- -- -- -- - -- -- — — -- -- -- Dry 04/26/93 1156 5072 000 -3916 — 43000 — 8000 ND<125 NIM 25 ND<125 -- — 07/26/93 1156 5172 000 4016 -100 18000 — 2900 47 38 90 -- — 10/20/93 1156 5226 000 4070 -054 12000 — 24400 52 ND<20 60 -- — 01/17/94 1156 4974 000 -38 18 252 14000 — 1800 31 29 120 -- -- 04/25194 1156 4761 000 -3605 -- 21000 — 8000 240 93 220 -- - 07/25/94 1156 5007 -- -3851 -246 — — -- — — __ _ lnaccesslble 10/26194 1156 5125 000 -3969 -1 18 24000 -- 11000 3100 96 3200 -- 01/25/95 1156 48 49 000 -3693 276 8600 -- 4100 94 35 130 -- 04/26/95 1156 43 88 000 -3232 461 11000 5300 460 74 530 -- -- 07/26/95 1156 44 95 000 -3339 -107 3300 -- 640 26 ND<12 5 13 -- -- 10/25/95 1156 45 84 000 -3428 -089 -- -- -- — 01/24/96 11 56 4305 0 00 -3149 279 2100 -- 510 29 ND<10 11 -- — 04/25/96 1156 3822 000 -2666 -- -- -- -- _ _ __ — _ 07/24/96 1156 3860 000 -2704 -038 1300 -- 470 110 16 75 36 -- 10/23/96 1156 4043 -2887 -183 -- -- — -- — _ — Sampled Serra-annually 01/20/97 1156 3693 000 -2537 330 250 -- 72 13 45 16 18 -- 07116/97 1156 3424 000 -2268 -- 16000 - 3900 220 180 390 ND<250 -- 10/15/97 1156 3608 000 -2452 -184 12000 -- 3500 200 170 640 ND<500 120 12/08/97 1156 3614 000 -2458 -006 -- -- — _ ._ .. — _ 03/05/98 1156 3268 000 -2112 346 10000 — 1900 ND<50 150 180 280 300 05/27/98 1 156 2931 000 -1775 -- 8600 — 1400 18 56 65 47 270 07/21/98 1156 2931 000 -1675 100 490 -- 85 56 29 24 220 180 10/14/98 1156 29 26 000 -1770 .095 2900 -- 620 17 36 56 380 190 es87 Page 4 of 35