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Ta*aaGroundwater Monitoringand Analytical Results <br /> Tosca(Former Unocal) Bulk Plant#0788 <br /> 8203 Fast 11th Street <br /> Tracy, California <br /> We11ID1 Date DTW GWE TPH(D) TPH(G) B T E X MTBE <br /> TOC+. ' (ft.) (msl) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (Ppb) <br /> U4 05/23/91 501 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 -- <br /> 05/08/92 ND ND ND ND ND ND -- <br /> 08/06/92 i002 ND ND ND ND ND <br /> 11/18/92 702 ND ND ND ND ND -- <br /> 01/21/93 ND ND ND ND ND ND -- <br /> 05/26/93 63 ND ND ND ND ND -- <br /> 08/24/93 ND ND ND ND ND ND -- <br /> 11/30/93 ND ND ND ND ND ND -- <br /> 02/18/94 ND ND ND ND ND ND -- <br /> 05l12194 ND ND ND ND ND ND -- <br /> 08/08/94 558 ND ND ND ND ND -- <br /> 11l08/94 ND ND ND ND ND ND -- <br /> i 02/13/95 ND ND ND ND ND ND -- <br /> 45.19 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 -- -- - - -' -- '- <br /> 05106/97 6.49 38.70 NO ND ND ND ND ND -- <br /> 04/29/98 8.18 37.01 10018 ND 1.2 ND ND ND ND <br /> 12/01/98 8.67 36.52 — -- -- -- -- -- <br /> U-5 05/23/91 1801 3,200 42 240 68 440 -- <br /> 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 /> 08106/92 1202 510 33 3.7 13 4.0 -- <br /> 11118192 502 ND ND ND ND ND -- <br /> 01/21/93 2,6003 3,500 190 350 47 500 -- <br /> I <br /> 05/26/935 340 180 13 2.0 17 17 --08124l93 250 360 24 6.2 27 22 -- <br /> 11/30/93 65 ND ND ND ND ND -- I <br /> 02118194 59 91 3.3 0.57 0.63 2.0 -- <br /> 05/12/94 54 ND 1.4 0.63 ND 0.60 -- <br /> 08/08/94 60' ND ND 1.1 0.56 1.7 -- <br /> 0788.x1s/#180144 3 As of 12/01/98 <br />