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Table 1 Groundwater Monitoring Data and Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California Wm IDI DATE DTW SI GW>a TPH•G B T E X MTBE TOC*(ft) (A) (ft hgr) (ppb) fperi) (Ppb) (ppb) (pp-N (ppb) MW-7 10/23/96 4084 49 0-69 0 -2902 SAMPLED SEMI-ANNUALLY - - -- _ (cont) 01/20/97 37 14 -2532 <50 059 <0 5 <0 5 <015 20 07/16/97 3471 -2289 <50 <0 5 <0 5 <05 <0 5 40 10/15/97 3654 -2472 <50 <0 5 <0 5 <0 5 46 46163 12/08/97 3637 -2455 03/05/98 3198 -2016 <50 <0 50 <0 50 <0 50 <0 50 1401120'` 05/27/98 2870 -1688 <50 <0 50 <0 50 <0 50 <050 461536 07121198 2875 -1693 <50 069 088 <0 50 073 21/22 6 10/14/98 2974 -1792 <50 <0 50 <0 50 <0 50 <0 50 33/33 01125-26199 2880 -1698 <50 <0 50 <0 50 <0 50 <0 50 401356 04/19-20/99 2641 -1459 <50 1 3 <0 50 <0 50 <0,50 160/1206 07115-16199 2780 -1598 <50 <0 50 <0 50 <0 50 066 260/3206 1182 10125-26199 2948 -1766 <50 38 084 <0 50 23 2401250E 01127-28/00 2893 -1711 <50 42 073 <0 50 20 220/2106 06126-27/00 2623 -1441 <50 0 2 15 112 <0 500 1 52 131/109' 11 82 09/22-23100 2877 -1695 <50 45 <0 50 <0 50 1 2 130/1106 12126-27100 2864 -1682 <50 0 224 <0 500 <0 500 <0 500 95 2173 36 03/07-08101 2835 -1653 <50 0 0 659 <0 500 <0 500 <0 500 54 9158 56 06126-27101 2936 -1754 <50 15 <0 50 <0 50 <0 50 130/1406 09112-13101 31 31 -1949 7016 <0 50 <0 50 <0 50 <0 50 200/2006 12112-13101 3154 -1972 <50 <0 50 <0 50 <0 50 <0 50 150/1906 E MW-8 04/16/92 -- 49 0-69 0 -- -- -- -- -- 07/30/92 -- -- <50 1 7 <0 5 <0 5 <0 5 - 10/21-22192 -- -- <50 <0 5 08 <0 5 <0:5 -- 01/13/93 -- <50 <0 5 <0 5 <0 5 <0 5 1038 04/26/93 4980 -3842 120 1 1 <0 5 <0 5 <0'5 -- 07/26/93 4979 -3941 90 06 <0 5 <0 5 <0 5 -- 10/20/93 5028 -3990 92 40 072 076 1 8', -- OU17-18/942 4785 -3747 620 39 27 11 48'; -- 02/28/94' 4677 -3639 88 <0 5 <0 i <0 5 09 -- 6981 xls/1038 i As 011/01 I