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Table 1 Groundwater Monitoring Data and Analytical Results Tosco (Unocal) Service Station(16981 4707 Pacific Avenue Stockton, California Well ID/ Date DTW GWE TPH(G) B T - E X fc MTBE TOC* Of? Of (Ppb) Pb) (Ppb) (ppb) wbi, (Po) MW-7 07/21/98 28 75 -16 93 <50 069 088 <0 50 0 73; 211226 (cont) 10/14/98 2974 -1792 <50 <0 50 <0 50 <0 50 <0 50 331336 01125-26199 28 80 -1698 <50 <0 50 <0 50 <0 50 <0 50 401356 04/19-20199 2641 -14 59 <50 1 3 <0 50 <0 50 <0 50 160/1206 07/15-16199 2780 -1598 <50,- <0 50 <0 50-1 <0 50' 0 663' 260/3206 NNW-8 04/16/92 - - NOT SAMPLED - 07/30/92 -- <50 1 7 <0 5 <05 <05 -- 10/21-22192 __ _ <50 <05 08 <05 <05 -- 01/13/93 -- <50 <05 <0 5 <05 <05 1038 04/26/93 48 80 -3842 120 1 1 <0 5 <05 <0 5 - 07/26/93 4979 -3941 90 06 <0 5 <0 5 <05 -- 10/20/93 5028 -3990 92 40 072 076 1 8 - 01117-181942 47 85 -3747 620 3 9 27 11 48 -- 02/28194'- 4677 -36 39 88 <05 <05 <05 09 04125-26194 45 81 -35 43 94 067 1 2 052 24 - 07125-26194 48 20 -37 82 170 <05 082 <0 5 1 7 10/26-27194 49 33 -38 95 <50 <0 5 <0 5 <0 5 1 3,I 01/25-26/95 4663 -3625 <50 <0 5 072 <05 1 4 - 04/26-27/95 42 13 -31 75 <50 <0 5 <0 5 <05 <0 5 -- 07/26/95 43 10 -3272 <50 079 22 <05 2 7 - 10125-26/95 4394 -33 56 - -- - -- - 01/25/96 41 14 30 76 <50 <05 <05 <05 065 - 04/25/96 36 59 -26 21 - - -- - -- 07l24/96 36 88 -2650 <50 <05 <05 <05 <0 5 <5 0 10/23/96 38 64 -28 26 SAMPLED SEMI-ANNUALLY - -- -- -- 01/20/97 35 17 -2479 290 4 3 082 <05 45, 9 3 07/16/97 3247 -22 09 <50 <05 <05 <0 5 <05 <50 10115197; INACCESSIBLE -- -- + - 12108197' INACCESSIBLE -- -- -- -- 03/05198 3007 -1969 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 { 05127/98 26 61 -1623 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 07/21/98 2665 -1627 7311 093 40 072 4 3 ' 13/896 10/14/98 27 57 -17 19 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 6981 0138 VAs16!99