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1 Ta Groundwater Monitoring Wand Analytical Results • Tosco (Former Unocal) Bulk Plant#0788 8203 East IIth Street Tracy, California WeU IN Date DTW GWE TPH(D) TPH(G) B T E $ MTBE TOC* {fi.) (ms[) (ppb) (ppb) WN (Ppb) (Ppb) (Ppb) (Ppb) U-5 11/18/92 - - 50'- ND ND ND ND ND -- (cont) 01/21/93 -- -- 2,600' 3,500 190 350 47 500 -- 44,93 05/26/935 8.25 36.68 340 180 13 2.0 17 17 -- 08/24193 8.28 36.65 250 360 24 6.2 27 22 -- 44.32 1I/30/93 8.18 36.14 65 ND ND ND ND ND -- 02/18/94 7.94 36.38 59 91 3.3 0.57 0.63 2.0 -- 05112/94 7.57 36.75 54 ND 1.4 0.63 ND 0.60 -- 08/08/94 7.30 37.02 608 ND ND 1.1 0.56 1.7 -- 11/08/94 8.60 35.72 ND ND ND ND ND ND -- 02/13/95 8.08 36.24 ND 579 0.90 ND ND ND -- 10/10/95 8.47 35.85 ND ND ND ND ND ND -- 02/13/96 7.81 36.51 2,8008 5,100 240 270 250 2,300 - 11/06/96 7.31 37.01 ND ND ND ND ND ND -- 05/06/97 6.63 37.69 4908 ND 0.65 ND ND ND -- 04/29/98 8.03 36.29 1,20010 ND ND ND ND ND ND If 12/01/98 8.19 36.13 12010 ND ND ND ND ND ND 05/24/99 7.52 36.80 ND ND ND ND ND ND ND U-6 05/23/91 -- -- 280' 240 17 6.0 3.0 22 -- 08/30/91 - -- ND ND 0.5 0.5 0.87 1.9 -- 11/06191 - ND 280 8.2 4.8 18 26 -- 05/08/92 -- -- 3002 ND ND ND ND ND -- 08/06/92 -- -- ND 190 2.2 0.7 8.7 26 -- 11/18/92 -- - 230 230 6.5 ND 11 16 -- 01/21/93 -- -- 2,300' 6,100 400 99 460 590 -- 44.22 05/26/935 7.95 36.27 380 600 15 6.5 34 115 -- 08/24/93 7.79 36.43 946 170 0.5 ND 3.5 5.7 -- 43.86 11/30/93 8.21 35.65 ND 120 4.1 1.6 3.1 1.9 -- 02118/94 8.02 35.84 76' 120 1.3 ND 1.8 3.6 -- 05/12/94 7.70 36.16 64 ND 1.1 ND 1.4 3.5 -- 08/08/94 7.12 36.74 56' ND ND ND ND ND -- 11/08/94 8.64 35.22 ND ND ND ND ND ND -- 02113/95 8.11 35.75 910$ 1,000 19 ND 64 48 -- 10/I0/95 8.48 35.38 ND ND ND ND ND ND -- 02/13/96 7.84 36.02 2208 68 0.62 ND 0.57 ND -- 0788.xls/#180144 4 As of 05/24/99