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Groundwater Monitoringwand Analytical Results Tosco (Former Unocal) Bulk Plant (#0788 8203 East 11 th Street Tracy, California Well ED/ Date DTW GWE TPH(D) TPH(G) B T E X MTBE j TOC* (ft.) (msl) (ppb) (ppb) Wb) Wb) (pp b) (Ppb) (pb) U-6 11/06/96 7.26 36.60 ND ND ND ND 0.73 0.81 -- (cont) 05/06/97 7.02 36.84 ND ND ND ND ND ND -- 04129/98 8.08 35.78 140E0 ND ND ND ND ND ND 12/01/98 8.22 35.64 20010 ND ND ND ND ND 32 05124/99 7.68 36.18 ND ND ND ND ND ND ND U-7 08/06/92 -- -- ND ND ND ND ND ND -- • 11/18/92 - -- 502 ND ND ND ND ND -- 01/21/93 -- -- ND ND ND ND ND ND -- 44.67 05/26/93 8.22 36.45 62 ND ND ND ND ND -- 08/24/93 7.98 36.69 1206 ND ND ND ND ND -- 44.24 11/30/93 8.38 35.86 ND ND ND ND ND ND -- 02/18/94 INACCESSIBLE -- - -- - -- -- -- 05/12/94 7.79 36.45 ND ND ND ND ND ND -- 08/08/94 7.16 37.08 ND ND ND ND ND ND -- 4 11/08/94 8.80 35.44 ND ND ND ND ND ND -- 02/13/95 8.47 35.77 ND ND ND ND ND ND -- 10/10/95 8.68 35.56 ND ND ND ND ND ND -- 02/13/96 8.02 36.22 ND ND ND ND ND ND -- { 11106/96 7.30 36.94 ND ND ND ND ND ND 05/06/97 7.04 37.20 ND ND ND ND ND ND -- 04/29198 8.18 36.06 8010 ND ND ND ND ND ND . 12/01/98 8.37 35.87 ND ND ND ND ND ND ND 05/24/99 7.83 36.41 ND ND ND ND ND ND ND U-8 08/06/92 -- -- ND ND ND ND ND ND -- 11/18/92 -- -- 602 ND ND ND ND ND -- 01/21/93 -- -- 1803 70 ND ND 4.4 11 -- 44.14 05/26/93 7.92 36.22 120 ND ND ND ND ND -- h 08/24/93 7.80 36.34 1506 ND ND ND ND ND -- 43.86 11/30/93 8.22 35.64 ND ND ND ND ND ND -- 0211804 7.98 35.88 ND ND ND ND ND ND -- 05/12/94 7.68 36.18 ND ND ND ND ND ND -- 08/08/94 7.20 36.66 ND ND ND ND ND ND -- 0788.xls1//180144 5 As of 05/24199 j