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Table 2 HISTORIC GROUNDWATER LEVELS AND CHEMICAL ANALYSIS RESULTS May 1990 Through May 2004 Farmer BP 0€111192 Dake 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 8021E 82608 Elevation Elevation (feet) (feet) (feet) (feet) (feet) (µg11) (µg/1) (µg/1) (µg/1) (µg/1) (µg/1) (µg11) (40) MW-1 08/05/91 552 -- -- -- -- -- -- -- -- -- -- Dry 12/09/91 552 -- -- -- -- -- _. _ _ __ w — Dry I 03/09/92 552 -- -- -- -- — — -- -- -- -- -- — Dry 06/19/92 5 52 -- — -- -- -- -• -- -- -- -- -- Dry 09/18/92 5 52 -- -- -- -- -- -- — -- -- -- -- -- Dry 12/09/92 5 52 — -- — -- -- -- -- -- -- -- -- -- Dry 02/15/95 552 04/21/95 5 52 2382 000 -1830 -- 820 -- 27 26 3 1 5 6 -- -- 07/19/95 5 52 2292 000 -1740 090 620 -- 40 2 2 4 2 3 -- -- 10/20/95 5 52 2332 0 00 -1780 -- 450 -- 30 067 0 6 1 5 3 -- 04/23/96 5 52 1987 000 .1435 3 45 ND<500 -- 10 ND<0 5 ND<0 5 ND<0 5 42 -- 07/12/96 5 52 2099 000 -1547 -112 -- — -- -- -- -- -- -- 10/18/96 552 2016 000 -14 64 0 83 160 — ND<0 5 ND<1 0 ND<1 0 ND<1 0 ND<10 — 02/26/98 552 1190 000 -638 826 470 -- 16 ND<1 0 ND<1 0 ND<l 0 370 -- 07/07/98 5 52 1140 000 -588 050 800 -- ND<0 S ND<1 0 ND<1 0 ND<1 0 700 01/19/99 552 1347 000 -795 -207 730 ND<1 0 ND<l 0 ND<1 0 ND<1 0 840 -- 07/14/99 5 52 1227 000 -6.75 120 3000 -- ND<1 0 ND<1 0 ND<1 0 NIK 0 3300 -- 10/07/99 5 52 1390 000 -838 -- 4000 -- ND 01/20/00 552 1419 000 -867 -029 ND<50 -- ND<0 5 ND<0 5 ND<0 5 ND<0 5 2400 -- 04/11/00 552 1483 000 -931 -064 1100 — ND<0 5 ND<0 5 ND<0 5 ND<0 5 3700 -- 07/14/00 5 52 1172 0 00 -620 3 11 510 -- ND<0 5 ND<0 5 ND<0 5 ND<0 5 1300 -- 10/26/00 552 1338 000 -786 -166 230 -- 057 ND<0 5 ND<0 5 076 3000 — 01/16/01 5 52 1325 000 .773 013 230 -- 0 688 ND<0 5 ND<0 5 ND<0 5 271 -- 04/12/01 5 52 1181 000 -629 144 650 -- ND<0 5 ND<0 5 ND<0 5 ND<l 5 921 -- 07/23/01 552 1335 0 00 -783 -1,54 1400 -- ND<0 5 ND<0 5 ND<0 5 ND<l 5 1610 •- 11192 Pag*14