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Table 1 Groundwater Monitoring Data and Analytical Results Tosco(Unocal) Service Station#6981 4707 Pacific Avenue d Stockton, California WeIIID/ Date DTW GWE TPH(G) B T E X 1� MTBE TOC' Ut 1 (ft)I (ppb) (ppb) (Ppb) (ppb) (Ppb) k (ppb) MW-9 10/20/93 5199 4023 <50 <05 <0 5 <0 5 <0 5 Ili -- (cont) 01/17-181942 4958 -3782 280 49 15 9 1 45 -- 02/28/94' 4850 -3674 <50 <0 5 <05 <05 <0 5 - 04/25-26194 47 51 -35 75 <50 <0 5 0 94 <05 1 3 - 07125-26194 49 87 -38 11 <50 <0 5 <05 <05 <0 5 - 10126-27194 51 03 -3927 <50 <0 5 <05 <05 <05 -- 01/25-26195 4832 -3656 <50 <05 <05 <0 5 <0 5 - 04/26-27195 4344 -31 68 <50 12 4 1 <05 3 3 - 07/26/95 4461 -32 85 <50 <05 1 4 <05 1 2 -- 10l25-26195 45 54 -33 78 <50 <05 <0 5 <05 <05 -- 01/24/96 4274 -3098 <50 <05 <05 <05 <0 5 - 04/25/96 37 78 -2602 <50 <05 <0 5 <05 <05 <40 07/24/96 38 29 -26 53 <50 <05 <05 <05 <0 5 <5 0 10/23/96 40 18 -2842 <50 <05 <05 <05 <0 5 <5 0 01/20/97 36 17 -2441 <50 <05 <0 5 <05 <0 5 <5 0 07/16/97 33 84 -2208 <50 <0 5 <0 5 <0 5 <0 5 <50 10/15/97 35 75 -2399 <50 <0 5 <05 <0 5 <0 5 <5 0/<2 06 12/08/97 35 78 -2402 - -- - - 03/05/98 3080 -1904 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 05/27/98 2767 -1591 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 07/21/98 2791 -16 15 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 09 10/14/98 2899 -1723 <50 <0 50 <0 50 <0 50 <0 50i <2 51<2 06 01125-26199 2822 -1646 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 04/19-20199 2573 -1397 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 MW-10 10121-22192 - <50 <0 5 <05 <0 5 <0 5 -- 01/13/93 -- -- <50 <0 5 <05 <05 <0 5' -- 1044 04/26/93 4825 -37 81 <50 <0 5 <0 5 <0 5 <0 5 I' -- 07/26/93 4922 -38 78 <50 <0 5 <05 <0 5 <0 5 10120/93 4968 -3924 <50 <0 5 <0 5 <0 5 <0 5 - 01117-181942 4729 -36 85 250 42 30 12 53 - 02/28/942 4624 -35 80 <50 <0 5 <0 5 <05 <05 - 04/25-26194 4530 -34 86 <50 <0 5 <05 <0 5 1 1 07/25-26194 4768 -3724 <50 <0 5 <05 <0 5 <05 10126-27194 4877 -38 33 <50 <05 <0 5 <05 <05 -- r 6981 x1138 0 As of 199 Y