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Table 2 HISTORIC GROUNDWATER LEVELS AND CHEMICAL ANALYSIS RESULTS May 1990 Through May 2004 Former BP Oil 11192 Date TOC Depth to LPH Ground- Change TPH-G TPPH Benzene Toluene Ethyl- Total MTBE MTBE Comments Sampled Elevation Water Thickn= water in 8260B benzene Xylenes 80213 8260B Elevation Elevation (feet) (feet) (feet) (feet) {feet) (µg11) (µg/1) (µg/1) (µg/1) (µg(l) (µg11) (µg/1) (µg11) MW-1 08/05/91 552 - -- - — - -- — -- — -- Dry 12/09/91 552 -- -- -- — -- -- -- -- -- — -- Dry 03/09/92 552 -- -- -- -- - — -- -- — -- -- Dry 06/19/92 552 -- -- - — - - — -. -. - - — Dry 09/18/92 552 -- — -- — - -- - -- -- — -- -- Dry 12/09/92 552 -- -- -- — -- — __ __ __ _ __ _ Dry 02/15/95 552 -- — -- -- -- — -- -- -- -- -- -- 04/21/95 552 2382 000 -1930 — 820 — 27 26 3 I 56 -- — 07/19/95 552 2292 000 -1740 090 620 — 40 2 24 23 — -- 10/20/95 552 2332 000 -1780 — 450 - 30 067 06 1 53 - 04/23/96 552 1987 000 -1435 345 ND<500 - 10 ND<0 5 ND<0 5 ND<0 5 42 -- 07/12/96 552 2099 000 -1547 -1 12 -- -- -- -- -- -- 10/18/96 552 2016 000 -14 64 083 160 -- ND<0 5 ND<l 0 ND<l 0 ND<l 0 ND<10 -- 02/26/98 5 52 1190 000 -638 826 470 -- 145 ND<1 0 ND<1 0 ND<l 0 370 -- 07/07/98 112 1140 000 -511 011 800 -- ND<0 5 ND<1 0 ND<10 ND<1 0 700 01/19/99 552 1347 000 -795 -207 730 -- ND<10 ND<l 0 ND<l 0 ND<1 0 840 -- 07/14/99 552 1227 000 -675 120 3000 -- ND<10 ND<l 0 ND<l 0 ND<1 0 3300 -- 10/07/99 552 1390 000 -838 — 4000 -- ND<10 ND<1 0 ND<10 ND<1 0 2500 -- 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 -- 07/14/00 552 1172 000 -620 3 11 510 -- ND<0 5 ND<0 5 ND<0 5 ND<0 5 1300 -- 10/26/00 552 1338 000 -796 -166 230 -- 057 ND<0 5 ND<0 5 076 3000 -- 01/16/01 552 1325 000 -773 013 230 -- 0 688 ND<0 5 ND<0 5 ND<0 5 271 -- 04/12101 552 1181 000 -629 144 650 ND<0 5 ND<0 5 ND<0 5 ND<1 5 921 07/23/01 552 1335 000 -793 -154 1400 -- ND<0 5 ND<0 5 ND<0 5 NIX1 5 1610 — 11192 Page 1 of 14