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i Ta�1 Groundwater Monitoringla and Analytical Results Tosca(Former Unocal) Bulk Plant#0788 8203 East 111h Street iTracy, California We11ID1 Date DTW GWE TPH(D) TPH(G) B T E X MTBE TOC* (ft.) (msl) (Ppb) Wb) Pb) (ppb) (ppb) (Ppb) b) U-1 02/14/91 ND 140 10 ND ND 2.1 -- 05/23/91 ND 60 56 ND ND 1.0 -- 08/30/91 ND ND 13 ND ND ND -- 11/06/91 ND ND ND ND ND ND -- 05/08/92 2002 ND 8.7 0.7 ND ND - 08/06/92 ND ND ND ND ND ND -- 11/18/92 602 ND ND ND ND ND - 01/21/93 ND ND ND ND ND ND -- 05/26/93 100 ND 5.7 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 -- 08/08/94 588 ND 10 ND ND ND -- 11/08/94 558 ND ND ND ND ND -- 02/13/95 ND ND 1.1 ND ND ND -- 44.64 10/10/95 8.92 35.72 ND ND ND ND ND ND -- 02/13/96 8.24 36.40 ND ND ND ND ND ND -- 11/06/96 7.45 37.19 ND ND ND ND ND ND -- 05/06/97 7.04 37.60 ND ND ND ND ND ND - 04/29/98 8.35 36.29 56'0 ND ND ND ND ND ND 12/01/98 8.62 36.02 10010 ND 2.5 ND ND ND 2.9 U-2 02/14/9I ND 230 6.9 ND 4.5 35 -- 05/23/91 ND 350 10 ND 13 57 - 08/30l91 ND 1,700 53 ND 90 110 -- 11/06/91 ND 290' 18 ND 12 30 -- 05/08/92 ND 430 18 ND 22 70 - 08/06/92 ND ND ND ND ND ND -- 11/18/92 502 ND ND ND ND ND -- 01/21/93 ND 70 8.2 ND ND 2.1 -- 05/26/93 ND 110 13 ND 3.3 23 -- 08/24/93 110 ND ND ND ND ND -- 11/30/93 ND ND ND ND ND ND -- 02/18/94 ND ND ND ND ND ND - 0788.xls1#180144 1 As of 12/01/98