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TAW Groundwater Monitoring IM and Analytical Results . Tosco (Former Unocal) Bulk Plant#0788 8203 East 11th Street Tracy, California Well IDI Date DTW GWE TPH(D) TPH(G) B T E X MTBE TOC* (ft.) (MSI) -----(Ppb) (ppb) (Ppb) (ppb) (ppb) (Ppb) (p b) U-9 08/06/92 ND ND ND ND ND ND -- 11/18/92 3902 ND ND ND ND ND -- 01/21/93 ND ND ND ND ND ND -- 05/26/935 90 ND ND ND ND ND -- 08/24/93 ND ND ND ND ND ND -- 11/30/93 ND ND ND ND ND ND -- 02/18/94 ND ND ND ND ND ND -- 05/12/94 ND ND ND ND ND ND -- 08/08/94 ND ND ND ND ND ND -- 11/08/94 ND ND ND ND ND ND -- 02/13/95 ND ND ND ND ND ND -- 43.76 10/10/95 8.21 35.55 SAMPLED ANNUALLY -- -- -- -- 02/13/96 7.56 36.20 ND ND ND ND ND ND -- 11/06/96 7.08 36.68 -- - -- -- - -- -- 05/06/97 6.04 37.72 ND ND ND ND ND ND - 04/29/98 7.87 35.89 13010 ND ND ND ND ND ND 12/01/98 8.00 35.76 -- -- -- -- — _ _- U-10 08/06192 ND ND ND ND ND ND -- 11/18/92 702 ND ND ND ND ND -- 01/21/93 ND ND ND ND ND ND -- 05/26/93 95 ND ND ND ND ND -- 08/24/93 ND ND ND ND ND ND - 11/30/93 ND ND ND ND ND ND -- 02/18/94 ND ND ND ND ND ND -- 05/12/94 ND ND ND ND ND ND -- 08/08/94 ND ND ND ND ND ND - 11/08/94 ND ND ND ND ND ND -- 02/13/95 ND ND ND ND ND ND -- 43.11 10/10/95 7.79 35.32 SAMPLED ANNUALLY -- -- - -- -- 02/13/96 7.15 35.96 ND ND ND ND ND ND - 11/06/96 6.69 36.42 -- -- - -- -- -- 05/06/97 5.98 37.13 ND ND ND ND ND ND -- 04/29/98 7.35 35.76 6910 ND ND ND ND ND ND 12/01/98 7.58 35.53 -- — 0788.xis/#180144 6 As of 12101/98