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T�1 • Groundwater Monitoring lata and Analytical Results Tosco (Former Unocal) Bulk Plant #0788 8203 East 11th Street Tracy, California Wef IDI Date DTW GWE TPH(D) TPH(G) B T E X MTBE TOC* (ft.) (msl) (Ppb) (ppb) (ppb) (Ppb) (Ppb) (ppb) (ppb) U-2 02/18/94 8.61 36.63 ND ND ND ND ND ND -- (cont) 05/12/94 8.21 37.03 ND 149 9.7 ND ND 30 -- 08/08/94 8.09 37.15 588 ND ND ND ND ND =� 11108/94 9.37 35.87 ND ND ND ND ND ND 02/13/95 9.02 36.22 ND ND ND ND ND ND -- 10/10/95 9.22 36.02 ND ND ND ND ND ND 02/13/96 8.52 36.72 ND ND ND ND ND ND -- 11/06/96 7.72 37.52 ND ND ND ND ND ND -- 05/06/97 6.88 38.36 ND ND ND ND ND ND -- 04129/98 8.62 36.62 7610 ND !.1 ND ND ND ND 12/01/98 8.91 36.33 7614 ND ND ND ND ND ND 05/24/99 8.31 36.93 --11 ND ND ND ND ND ND U-3 02/14/91 -- -- ND ND ND ND ND ND -- 05/23/91 -- - ND ND ND ND ND ND -- 08/30/91 -- - ND ND ND ND ND ND - IE 11/06/91 -- ND ND ND ND ND ND -- 05/08/92 -- - ND ND ND ND ND ND - 08/06/92 - ND ND ND ND ND ND -- i 11/18/92 -- 602 ND ND ND ND ND -- 01/21/93 -- -- ND ND ND ND ND ND • 45.28 05/26/93 8.42 36.86 ND ND ND ND ND ND -- 08/24/93 8.50 36.78 ND ND ND ND ND ND -- 45.15 11/30/93 8.90 36.25 ND ND ND ND ND ND -- 02/18/94 8.61 36.54 ND ND ND ND ND ND -- 05/12/94 8.23 36.92 ND ND ND ND ND ND - 08/08/94 8,02 37.13 588 ND ND ND ND ND -- 11/08/94 9.34 35.81 ND ND ND ND ND ND -- 02/13/95 9.02 36.13 ND ND ND ND ND ND -- I ND -- 10110/95 9.21 35.94 ND ND ND ND ND 02/13/96 8.52 36.63 ND ND ND ND ND ND -- 11/06/96 7.83 37.32 ND ND ND ND ND ND -- 05/06/97 7.07 38.08 608 ND ND ND ND ND -- I 0788als1#180144 2 As of 05/24199