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t Tai Groundwater Monitoring W and Analytical Results Tosco (Former Unocal) Bulk Plant#0788 8203 East 11 th Street Tracy, California Well ID/ Date DTW GWE TPH(D) TPH(G) B T E x MTBE TOC* (ft.) (ms!) (ppb) (ppb) (ppb) (ppb) b) pb) b) U-1 02114191 -- -- ND 140 10 ND ND 2.1 - 05/23/91 - - ND 60 56 ND ND 1.0 -- 08/30/91 -- - ND ND 13 ND ND ND -- 11/06/91 - -- ND ND ND ND ND ND -- 05/08/92 -- -- 2002 ND 8.7 0.7 ND ND -- 08/06/92 - ND ND ND ND ND ND -- 11/18/92 - - 602 ND ND ND ND ND -- 01121l93 -- -- ND ND ND ND ND ND -- 44.91 05/26/93 8.30 36.6I 100 ND 5.7 ND ND ND -- 08/24/93 8.32 36.59 ND ND ND ND ND ND -- 44.64 11/30/93 8.62 36.02 ND ND ND ND ND ND -- 02/18/94 8.85 35.79 ND ND ND ND ND ND -- 05/12/94 7.99 36.65 ND ND ND ND ND ND -- 08/08/94 7.66 36.98 588 ND 10 ND ND ND - 11/08/94 9.06 35.58 55a ND ND ND ND ND - 02/13/95 8.71 35.93 ND ND 1.1 ND ND ND -- 10/10/95 8.92 35.72 ND ND ND ND ND ND -- 02/13/96 8.24 36.40 ND ND ND ND ND ND -- 11/06/96 7.45 37.19 ND ND ND ND ND ND -- 05/06/97 7.04 37.60 ND ND ND ND ND ND - 04/29/98 8.35 36.29 5610 ND ND ND ND ND ND 12/01/98 8.62 36.02 10010 ND 2.5 ND ND ND 2.9 05/24/99 8.08 36.56 ND ND ND ND ND ND ND U-2 02/14/91 -- -- ND 230 6.9 ND 4.5 35 -- 05/23/91 -- -- ND 350 l0 ND 13 57 - 08/30/91 - - ND 1,700 53 ND 90 110 -- 11/06/91 -- - ND 290' 18 ND 12 30 -- 05/08/92 - - ND 430 18 ND 22 70 -- 08/06/92 - -- ND ND ND ND ND ND -- 11/18192 -- -- 502 ND ND ND ND ND -- 01/21/93 -- -- ND 70 8.2 ND ND 2.1 -- 45.57 05/26/93 8.62 36.95 ND 110 13 ND 3.3 23 -- 08/24/93 8.80 36.77 110 ND ND ND ND ND -- 45.24 11/30/93 8.91 36.33 ND ND ND ND ND ND -- 0788.x15/#180144 1 As of 05/24/99 I