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i 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 MTBE Comments Sampled Elevation Water Tludcness water in 8260B benzene Xylenes 8021B 8260B Elevation Elevation (feet) (feet) (feet) (feet) (feet) (µg11) (µg/1) (jig/1) (µg11) (µ8I1) (µg11) (µg11) (41) MW-5 continued 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 5235 -- -4059 -054 21000 — 15000 120 ND<50 68 — -- 01/17/94 1176 4983 -- -3807 152 23000 — 13000 100 ND<50 75 _ -- 04/25/94 1176 4775 — -3599 — 16000 — 12000 92 31 70 — -- 07/25/94 1176 5016 -- -1840 -241 — — — -- — — -- -- Not Sampled Due to Construction 10/26/94 1176 5126 — -3950 -110 130010 -- 10000 790 ND<20 270 — -- 01/25/95 1176 4862 -- -3686 264 5000 — 3700 27 ND<0 5 44 -- -- 04/26/95 1176 4397 — -3221 465 2900 -- 650 12 23 16 — - 07/26/95 1176 4503 — -3327 -106 150 — 21 24 ND<l 0 19 -- -- 10/25/95 1176 4992 -- -3816 -489 -- -- — — — — -- -- 01/24/96 1176 4311 -- -3135 691 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<O 5 ND<O 5 69 69 10/23/96 1176 4053 -- -2877 -185 — -_ -- -- — — — Sampled Semi-annually 01/20/97 1176 3692 -- -2506 371 ND<50 -- ND<0 5 ND<O 5 ND<O 5 ND<O 5 -- 25 07/16/97 1176 3432 -- -2256 — ND<50 -- ND<0 5 ND<O 5 ND<O 5 ND<O 5 .- 34 10/1997 1176 3618 — -2442 -186 ND<50 -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 -- ND<5 0 12/08/97 1176 36 05 -- -2429 013 -- -- -- -- -- — -- — 03/05/98 1176 3166 -- -1990 439 ND<50 -- ND<O 50 ND<O 50 ND<O 50 ND<O 50 23 18 ssat Page 10 of 35