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Table 1 j Groundwater Monitoring Data and Analytical Results Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID/ DATE DTW S.I. GWE TPH•G B T E X MTBE TOC* (ft) {jt bgs) (MSI) (ppb) (ppb) (Ppb) (ppb) (ppb) (ppb) I MW-7 03/05/98 3198 49 0-69 0 -2016 <50 <0 50 <0 50 <0 50 <0 50 140/1206 (cont) 05/27/98 2870 -1688 <50 <0 50 <0 50 <0 50 <0 50 461536 07/21/98 2875 -1693 <50 069 088 <0 50 073 211226 10/14/98 2974 -1792 <50 <0 50 <0 50 <0 50 <0 50 33/336 01125-26199 2880 -1698 <50 <0 50 <0 50 <0 50 <0 50 401356 04119-20199 2641 -1459 <50 13 <0 50 <0 50 <0 50 160/1206 07115-16199 2780 -1598 <50 <0 50 <0 50 <0 50 066 260/3206 1182 10/25-26199 2948 -1766 <50 38 084 <0 50 23 240/2506 01127-28100 2893 -1711 <50 42 073 <0 50 20 220/2106 06126-27100 2623 -1441 <50 0 215 1 12 <0 500 152 13111096 1182 09122-23100 2877 -1695 <50 45 <0 50 <0 50 1 2 130/1106 12126.27100 2864 -1682 <50 0 224 <0 500 <0 500 <0 500 952/7336 MW-8 04/16/92 -- 49 0-69 0 -- NOT SAMPLED -- -- -- -- 07/30/92 -- -- <50 17 <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 -- I 1038 04/26/93 4880 -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 18 -- 01/17-18194' 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 -- 07125-26194 4820 -3782 170 <0 5 082 <0 5 1 71 -- 10126-27194 4933 -3895 <50 <0 5 <0 5 <0 5 1 31' -- 01/25-26195 4663 -3625 <50 <0 5 072 <0 5 14, -- 04126-27195 4213 -3175 <50 <0 5 <0 5 <0 5 <0 5 -- 07/26/95 43 10 -3272 <50 079 22 <0 5 2 7 i -- 10/25-26195 4394 -3356 -- -- -- -- 01/25/96 41 14 -3076 <50 <0 5 <0 5 <0 5 065 -- 04/25/96 3659 -2621 -- -- -- -- _ - ,I 6981 x1s/08 10 3' As 0271p0