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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) (PPb) (ppb) (Ppb) (ppb) (ppb) MW-7 07/21/98 2875 49 0-69 0 -1693 <50 069 088 <0 50 073 211226 (cont) 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 40/356 04/19-20/99 2641 -1459 <50 1 3 <0 50 <0 50 <0 50 160/1206 07/15-16/99 2780 -1598 <50 <0 50 <0 50 <0 50 0"66 260/3206 i 1182 10/25-26/99 2948 -1766 <50 38 084 <0 50 2 3 240/2506 01127-28100 2893 -1711 <50 42 073 <0 50 20 220/2106 06126-27/00 2623 -1441 <50 0 2 15 1 12 <0 500 1 52 131/1096 1182 09122-23100 2877 -1695 <50 45 <0 50 <0 50 12 130/1106 12/26-27/00 2864 -1682 <50 0 224 <0 500 <0 500 <0 500 95 2/73 36 03/07-08/01 2835 -1653 <50 0 0 659 <0 500 <0 500 <0 500 54 9158 56 I � MW-8 04/16/92 - 49 0-69 0 NOT SAMPLED -- -- -- -- 07/30/92 -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 <05 <0 5 <05 <0 5 - 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 i'8 -- 01117-18/942 4785 -3747 620 39 27 11 48 -- 02/28/942 4677 -3639 88 <0 5 <05 <0 5 09 - 04/25-26194 4581 -3543 94 067 12 052 24 -- 07/25-26194 4820 -3782 170 <0 5 082 <0 5 17 -- t0/26-27194 4933 -3895 <50 <0 5 <05 <05 1'3 -- 01/25-26/95 4663 -3625 <50 <05 072 <0 5 14 - 04/26-27195 42 13 -31 75 <50 <05 <0 5 <0 5 <0 5 07126/95 43 10 -3272 <50 079 22 <0 5 27 -- 10/25-26/95 4394 -3356 -- - - - 01/25/96 41 14 -3076 <50 <0 5 <0 5 <0 5 065 - 04/25/96 3659 -2621 -- -- -- -- i- -- 07/24/96 3688 -2650 <50 <0 5 <0 5 <0 5 <0 5 <5 0 6981 198013811003108101