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Table 1 Groundwater Monitoring Data and Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue 'I Stockton,California WM ID/ DATE DTW $I, GWE TPff G B T E X MTBE TOC*(1`1) ) Ut bgs) Ut (ppb) (ppb) (ppb) (ppb) (ppb (ppbl i MW-4 10/23/96 4030 51 0-55 0 -2867 SAMPLED SEMI-ANNUALLY - -- - _ (cant) 01/20/97 3679 -25 16 <50 <0 5 <0 5 <0 5 <0 5 12 07/16/97 3418 -2255 <50 <0 5 <0 5 <0 5 <0 5 <5 01256 10/15/97 3597 -2434 <50 <0 5 <0 5 <0 5 <0 5 <5 0/3 06 12/08/97 3574 -2411 -- -- __ __ -- 03/05/98 3171 -2008 3,5009 <5 0 61 59 220 381346 05/27/98 2829 -1666 <50 33 <0 50 <0 50 <0 50 271326 07/21/98 2831 -1668 <50 <0 50 18 <0 50 1 23 181186 10/14/98 2926 -1763 <50 <0 50 <0 50 <0 50 <0 50 141106 01125-26199 2847 -1684 <50 <0 50 <0 50 <0 50 I <0 50 9 51106 04119-20199 2606 -1443 <50 <0 50 <0 50 <0 50 <0 50 6 2/4 86 07115-16199 2736 -1573 <50 <0 50 <0 50 <0 50 I <0 50 3 214 66 1163 10/25-26199 2900 -1737 <90 <0 50 071 <0 50 23 52/33 6 01/27-28100 2851 -1688 <50 <0 50 066 <0 50 <0 50 <2 51<2 0" 06/26-27/00 2574 -1411 <50 0 <0 500 1 80 <0 500 154 <5 001<2 006 I 1 63 09122-23100 2814 -1651 <50 <0 50 to <0 50 1 099 <2 51<2 06 12126-27100 2819 -1656 <50 0 <0 500 <0 500 <0 500 I <0 500 <5 001<2 006 03107-08101 2793 -1630 <50 0 <0 500 <0 500 <0 500 <0 1500 <5 00/<2 006 06126-27/01 2888 -1725 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 0' 09112-13101 3078 -19 I5 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 06 12112-13/01 3105 -1942 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<1 01 03120-21/02 2986 -1823 <50 <0 50 <0 50 <0 50 <0 50 <5 01<2 I I 1 MW-5 02/21/90 -- 50 0-55 0 -- 3,600 77 16 05 I 17 -- 10/18/90 DRY -- -- -- -- -- -- -' I 11/19/90 DRY -- -- -- -- I -- -- 12/27/90 DRY -- -- -- -- -- -' 01/28/91 DRY -- -- -- -- -- -' 04/02/91 DRY -- -- -- -- -- -- 07/18/91 DRY -- -- -- -- -' '- '- 09/30/91 DRY -- -- -- -- '- -" -- I I 6 I AO/21102 981 ABS