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Ta� Groundwater Monitoring*a and Analytical Results Tosco (Former Unocal) Bulk Plant#0788 8203 East I ith Street Tracy, California Well ID/ Date DTW GWE TPH(D) TPH(G) 8 T E X MTBE TOCK (ft.) (ms!) (ppb) (PPb) ('Ppb) (ppb) tP.b) b) �) U-8 11/08/94 8.60 35.26 ND ND ND ND ND ND -- (cont) 02/13/95 8.29 35.57 ND ND ND ND ND ND -- 10/10/95 8.46 35.40 ND ND ND ND ND ND -- 02/13/96 7.82 36.04 ND ND ND ND ND ND -- 11/06/96 7.21 36.65 ND ND ND ND ND ND -- 05/06/97 6.97 36.89 ND ND ND ND ND ND -- • 04/29/98 8.10 35.76 76E0 ND ND ND ND ND ND 12/01/98 8.23 35.63 5010 ND ND ND ND ND ND 05/24/99 7.65 36.21 ND ND ND ND ND ND ND 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 -- 44.14 05/26/935 7.81 36.33 90 ND ND ND ND ND -- 08/24/93 7.94 36.20 ND ND ND ND ND ND -- 43.76 11/30/93 7.97 35.79 ND ND ND ND ND ND -- 02/18/94 7.70 36.06 ND ND ND ND ND ND -- 05/12/94 7.29 36.47 ND ND ND ND ND ND -- 08/08/94 7.18 36.58 ND ND ND ND ND ND -- 11/08/94 8.40 35.36 ND ND ND ND ND ND -- 02/13/95 8.08 35.68 ND ND ND ND ND ND -- 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 - -' '- -- -- 05/24/99 7.28 36.48 ND ND ND ND ND ND ND f 0788.x1s/J/180144 6 As of 05/24/99