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. TA&1 <br /> Groundwater Monitoring D'dfa and Analytical Results <br /> Tosco (Former Unocal) Bulk Plant #0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Well EIV Date DTW GWE TPH(D) TPH(G) B TE X MTBE <br /> TOC* (/l.) (msl) (ppb) (ppb) (ppb) "b) "b) b) b) <br /> U-3 04/29/98 8.60 36.55 8110 ND ND ND ND ND ND <br /> (cont) 12/01/98 8.90 36.25 13030 ND ND ND ND ND ND <br /> 05/24/99 8.35 36.80 7412 ND ND ND ND ND ND <br /> U4 05/23/91 -- -- 503 ND ND ND ND ND -- <br /> 08/30/91 -- ND ND ND ND ND ND -- <br /> 11/06/91 -- - ND ND ND ND ND ND -- a <br /> 05/08/92 - -- ND ND ND ND ND ND -- <br /> 08/06/92 -- - 1002 ND ND ND ND ND <br /> 1I/18/92 - - 702 ND ND ND ND ND -- <br /> 01/21/93 -- -- ND ND ND 'ND ND ND -- <br /> 45.59 05126/93 8.46 37.13 63 ND ND ND ND ND <br /> 08/24/93 8.65 36.94 ND ND ND ND ND ND -- <br /> 45.19 11/30/93 8.68 36.51 ND ND ND ND ND ND -- <br /> 02/18/94 8.42 36.77 ND ND ND ND ND ND -- <br /> 05/12/94 7.94 37.25 ND ND ND ND ND ND -- <br /> 08/08/94 7.88 37.31 558 ND ND ND ND ND <br /> 11/08/94 9.16 36.03 ND ND ND ND ND ND -- <br /> 02/13/95 8.59 36.60 ND ND ND ND ND ND -- <br /> 10/10/95 9.01 36.18 SAMPLED ANNUALLY -- -- -- -- -- <br /> 02/13/96 8.28 36.91 ND ND ND ND ND ND -- <br /> 11/06/96 7.57 37.62 -- - -- -- -- -- i <br /> 05/06/97 6.49 38.70 ND ND ND ND ND ND - <br /> 04/29/98 8.18 37.01 10010 ND 1.2 ND ND ND ND <br /> 12/01/98 8.67 36.52 -- - -- -- -- -- <br /> 05/24/99 8.10 37.09 ND ND ND ND ND ND ND <br /> I <br /> U-5 05/23/91 -- -- 1803 3,200 42 240 68 440 -- <br /> I 08/30/91 -- -- 380 2,200 100 13 71 170 -- <br /> 11/06/91 - - ND 1,400 66 6.1 54 38 -- <br /> 05/08/92 - -- 380 430 49 16 22 37 -- <br /> 08/06/92 -- - 1262 510 33 3.7 13 4.0 -- <br /> 0788.xls/#180144 3 As of 05/24/99 <br />