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Table 2 HISTORIC FLUID LEVELS AND SELECTED ANALYTICAL RESULTS May 1990 Through November 2004 Former B1 Oil 11192 Date TOC Depth to LPH Ground- Change TPH-G TPPH Benzene Toluene Ethyl- Total MTBE MTBE TBA Comments Sampled Elevation Water Thickness water in 8260E benzene Xylenes 8021B 8260E 8260B Elevation Elevation (feet) (feet) (feet) (feet) (feet) (µg/l) (11g11) (µg/1) (µg11) (µg/1) (µg/1) (µg/1) (µg/l) (µg/l) MW-1 05/01/90 552 2511 000 -1959 -- 140 -- 1 ND ND -- ND -- -- 08/05/91 552 -- -- -- -- - -- -- -- -- - Dry 12/09/91 5 52 -- -- -- -- -- - -- -- -- -- — -- - Dry 03/09/92 5 52 -- -- -- — -- - -- Dry 06/19/92 552 - - -- -- -- -- -- -- -- - Dry 09/18/92 5 52 -- -- -- -- - — -. - -- -- — Dry 12/09/92 5 52 -- -- — -- -- -- -- — -- -- __ _ Dry 02/I5/95 552 — -- — -- -- -- -- -- -- -- -- 04/21/95 5 52 23 82 000 -1830 -- 820 -- 27 2 6 3 1 56 -- -- D 04/21/95 5 52 2382 000 -18 30 000 720 - 31 29 3 5 57 -- -- - 07/19/95 552 2292 000 -1740 090 620 -- 40 2 24 23 - - P 10/20/95 552 -- -- — -- 440 -- 16 0 51 0 73 22 6 4 -- -- Pre-purge 9 10/20195 552 -- -- -- 480 17 ND<O 50 ND<O 50 1 5 ND<5 0 -- -- Pre-purge 10/20/95 5 52 2332 000 -1780 000 450 -- 30 0 67 0 6 1 53 -- -- D 10/20/95 552 2332 000 -1780 -- 460 -- 29 091 052 15 ND<5 0 -- -- P 04/23/96 552 -- -- -- -- ND<500 -- I I ND<O 5 ND<O 5 ND<O 5 49 -- -- Pre-purge 04/23/96 5 52 1987 0 00 -1435 000 ND<500 -- 10 ND<O 5 ND<O 5 ND<O 5 42 -- -- 07/12/96 552 2099 0 00 -1547 -1 12 -- -- -- -- -- -- -- 10/18/96 5 52 2016 000 -1464 0 83 160 -- ND<O 5 ND 02/26/98 5 52 1190 000 -638 826 470 -- 16 ND 07/07/98 552 1140 000 -588 050 800 ND<O 5 ND<1 0 ND<1 0 ND<1 0 700 -- E 01/19/99 552 1347 000 -795 -207 730 - ND<1 0 ND<l 0 ND<1 0 ND<1 0 840 -- 07/14/99 552 1227 000 -6 75 1 20 3000 -- ND<1 0 ND<l 0 ND 10/07/99 552 1390 000 -8 38 -- 4000 -- ND<1 0 ND<1 0 ND 11192 Page I of 18