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• ! i Table 2 HISTORIC FLUID LEVELS AND SELECTED ANALYTICAL RESULTS February 1990 Through September 2004 Former 76 Station 6981 Date TOC Depth to LPH Ground- Change TPH-G TPPH Benzene Toluene Ethyl- Total MTBE M7BE Comments Sampled Elevation Water Thickness water In 8260B benzene Xylenes 8021B 8260B Elevation Elevation (feet) (feet) (feet) (feet) (feet) (µg/1) (µg/1) (W) (µg11) (nn) (n/1) (µg/1) (µg11) MW-2 coatLnued 04/26/93 1156 50 72 000 -39 16 -- 43000 — 8000 ND<125 ND<125 ND<125 — -- 07/26/93 1156 5172 000 -4016 400 18000 — 2900 47 38 90 -- -- 10/20/93 1156 5226 000 -4070 -054 12000 — 2400 52 ND<20 60 -- — 01/17/94 1156 4974 0 00 -3818 252 14000 — 1800 31 29 120 — — 04l25194 1156 4761 000 .3605 — 21000 — 8000 240 93 220 — — 07/25/94 1156 5007 — -38 5l -246 — — — — -- — — — Inaccessible 10/26/94 1156 5125 000 -3969 -1 18 24000 — 11000 3100 96 3200 — — 01/25/95 1156 4849 000 -3693 276 8600 — 4100 94 35 130 — — 04/26/95 1156 4388 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 4584 000 -3429 -089 -- — — — -- — — — 01/24/96 1156 4305 000 -3149 279 2100 — 510 29 ND<10 11 3 — 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 4041 — -2887 -183 -- — — — — — — — Sampled Sem-annually 0112D/97 1156 3693 000 -2537 350 250 — 72 13 45 16 18 — 07/16/97 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 1156 2931 000 -1775 — 8600 — 1400 18 56 65 47 270 07/21/98 1156 2831 000 -1675 100 490 -- 85 56 29 24 220 180 10/14/98 1156 2926 0 00 -1770 -095 2900 -- 620 17 36 56 380 190 01/25/99 1156 2843 000 -1687 083 2200 — 610 21 24 72 270 170 8981 Page 4 of 35