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i Table 1 Groundwater Monitoring Data and Analytical Results Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL IDI DATE DTW S1 GWE TPH-G B T E X MTBE TOC* (ft) (ft bgs) (msl) (ppb) fPpb) (ppb) (ppb) (ppb) (ppb) MW-7 05/27/98 2870 49 0-69 0 -1688 <50 <0 50 <0 50 <0 50 <0 50 46/536 (cont) 07/21/98 2875 -1693 <50 069 088 <0 50 071, 21/22` 10/14/98 2974 -1792 <50 <0 50 <0 50 <0 50 <0 50 33133' 01125-26199 2880 -1698 <50 <0 50 <0 50 <0 50 <0 50 40/35 04119-20/99 2641 -1459 <50 13 <0 50 <0 50 <0 50 160/1206 07115-16/99 2780 -1598 <50 <0 50 <0 50 <0 50 0661 260/320i5 1182 10125-26199 2948 -1766 <50 3 8 084 <0 50 23 240/250 01/27-28100 2893 -1711 <50 42 073 <0 50 20 220/2106 06/26-27/00 2623 -1441 <50 0 215 1 12 <0 500 1 52 131/1096 11 82 09122-23/00 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 2/73 36 03/07-08101 2835 -1653 <50 0 0 659 <0 500 <0 500 <0 500 54 9/58 5`� 06126-27101 2936 -1754 <50 35 <0 50 <0 50 <0 50 130/140" MW-8 04/16/92 -- 49 0-69 0 -- NOT SAMPLED -- -- - - -- 07/30/92 - - <50 17 <0 5 <0 5 <0 5 -- 10121-22192 -- -- 60 <0 5 08 <0 5 <0 5 01/13/93 -- -- <50 <0 5 <0 5 <0 5 <0 5 1038 04/26/93 4880 -3842 120 1 1 <0 5 <0 5 <0 51 -- 07/26/93 4979 -3941 90 06 <0 5 <0 5 <0 51 - 10/20/93 5028 -3990 92 40 072 076 1 8 - 01/17-18/942 4785 -3747 620 39 27 11 48 -- 02/28/942 4677 -3639 88 <0 5 <0 5 <0 5 09 -- 04125-26/94 4581 -3543 94 067 12 052 24 -- 07/25-26194 4820 -3782 170 <0 5 082 <0 5 1 7 - 10/26-27/94 4933 -3895 <50 <0 5 <0 5 <0 5 1 3 -- 01/25-26195 4663 -3625 <50 <0 5 072 <0 5 14 h -- 04126-27/95 4213 -3175 <50 <0 5 <0 5 <0 5 <0 5 -- 07126/95 43 10 -3272 <50 079 22 <0 5 27 -- 10/25-26195 4394 -3356 -- -- -- -- -- 01125/96 41 14 -3076 <50 <0 5 <0 5 <0 5 065 -- 6981 x1s/098 As r As'107/01