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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 MTBE Comments Sampled Elevation Water Thickness water in 9260B benzene Xylenes 8021B 8260E Elevation Elevation (feet) (feet) (feet) (feet) (feet) (gg/l) (µg11) (µg/1) (141) (141) (µg/1) (µg/1) (µg/1) MW-5 continued 11/14/91 — -- — -- — -- -- -- -- Dry 04/16/92 - -- -- — -- -- — -- — -- -- -- _ Dry 07/30/92 — -- -- -- -- -- -- -_ - -- -- -- — Dry 10/21/92 -- — -- -- -- _ -- Dry 01/13/93 - -- — -- -- -- -- -- -- — -- — Dry 04/26/93 1176 5082 -- -3906 — 60000 -- 28000 ND<250 ND<250 ND<250 -- -- 07/26/93 1176 5181 -- -4005 -099 43000 — 19000 240 ND<125 ND<125 -- — 10/20/93 1176 52 35 — 4059 -054 21000 — 15000 120 NIX50 68 - -- 01/17l94 1176 4983 — -3807 252 23000 — 13000 100 ND<50 75 — -- 04/25/94 1176 4775 — -3599 — 16000 — 12000 92 31 70 -- -- 07/25/94 1176 5016 — -3840 -241 -- -- -- -- — .-. — __ Not Sampled Due to Construction 10/26/94 1176 5126 — -3950 -1 10 13000 — 10000 790 ND<20 270 — — 01/25/95 1176 4662 — -3686 264 5000 — 3700 27 ND<O 5 44 — 04/26/95 1176 4397 — -3221 465 2900 — 650 12 23 16 -- 07/26/95 1176 4503 -- -3327 -106 ISO — 21 24 ND<l 0 19 -- — 10/25/95 1176 4992 — -38 16 -489 — — — -- -- — — — 01/24/96 1176 43 11 — -3135 681 86 — 69 085 ND<O 5 084 -- — 04/25/96 1176 3831 — -2655 — — — — -- — -- -- — 07/24/96 1176 3868 — -2692 -037 ND<50 — ND<O 5 ND<O 5 ND<0 5 ND<O 5 69 69 10/23/96 1176 4053 -- -2877 -185 -- — — — -- -- .. Sampled Sena-annually 01/20/97 1176 3682 — -2506 371 ND<50 - ND<O 5 ND<O 5 ND<O 5 ND<O 5 -- 25 07/16/97 1176 3432 — -2256 -- ND<50 -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 34 10/15/97 1176 36 18 — -2442 -186 ND<50 — ND<O 5 ND<O 5 ND<O 5 ND<O 5 -- ND<5 0 asap Page 10 of 35