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i� Table 1 Groundwater Monitoring Data and Analytical Results Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California i WELL IDI DATE DTW S1 GWE TPA-G B T E X MTBE TOC* (jt} (ft bgs) (WO (ppb) (ppb) (ppb) (Ppb) (ppb) (ppb) MW-9 07/26/95 4461 50 0-70 0 -3285 <50 <0 5 14 <0 5 1 2 -- (cont) 10/25-26195 4554 -3378 <50 <0 5 <0 5 <0 5 <0 5 - 01/24/96 4274 -3098 <50 <0 5 <0 5 <0 5 <0 5 -- 04/25/96 3778 -2602 <50 <0 5 <0 5 <05 <0 5 <40 07/24/96 3829 -2653 <50 <0 5 <0 5 <05 <0 5 <5 0 10/23/96 4018 -2842 <50 <0 5 <0 5 <0 5 <0 5 <5 0 01/20/97 3617 -2441 <50 <0 5 <0 5 <0 5 <0 5 <5 0 07/16/97 3384 -2208 <50 <0 5 <0 5 <0 5 <0 5 <5 0 10/15/97 3575 -2399 <50 <0 5 <0 5 <0 5 <0 5 <5 0/<2 06 12/08/97 3578 -2402 -- -- -- -- -- -- 03/05/98 3080 -1904 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 O6 05/27/98 2767 -1591 <50 <0 50 <0 50 <0 50 <0 50 <2 51<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 50 <2 5/<2 06 01/25-26/99 2822 -1646 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 04/19-20/99 2573 -1397 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 11 0 07115-16/99 27 13 -1537 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 1176 10/25-26/99 2882 -1706 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 O6 01/27-28100 2846 -1670 <50 <0 50 16 <0 50 22 <2 5/<2 06 06126-27/00 2560 -1384 <50 0 <0 500 <0 500 <0 500 <0 500 <5 0012 046 1176 09122-23/00 28 17 -1641 <50 19 23 <0 50 23 35/34 6 12!26-27100 28 19 -1643 <50 0 <0 500 <0 500 <0 500 <0 500 <5 0012 35 11 03/07-08/01 2791 -1615 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00/3 2V MW-10 10/21-22/92 -- 50 0-70 0 -- <50 <05 <0 5 <0 5 <0 5 -- 01113/93 -- -- <50 <0 5 <0 5 <0 5 <0 5 1044 04/26/93 4825 -3781 <50 <0 5 <0 5 <0 5 c0 5 - 07/26/93 4922 -3878 <50 <05 <0 5 <0 5 <0 5 -- 10/20/93 4968 -3924 <50 <05 <0 5 <0 5 <i0 5 - 01/17-18/94' 4729 -3685 250 42 30 12 53 - 02/28/94z 4624 -3580 <50 <0 5 <05 <0 5 <0 5 -- 6981 0180138 *03/08/01