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Groundwater Monitoring Data and Analytical Results Tosco (Unocal) Service Station#6981 4707 Pacific Avenue Stockton, California WeD][D/ Date DTW GWE TPH(G) B T E X MTBE TQC* (ft,) (ft} (ppb) (ppb) (ppb) (ppb) (ppb) (Ppb) MW-7 01/17-18194 50 10 -38 28 15,000 4,800 460 290 620 -- (cont) 04/25-26194 4798 -36 16 8,300 3,700 <25 400 130 -- 07/25-26/94 5046 -38 64 9,300 3,300 54 420 120 -- 10/26-27/94 5163 -3981 3,700 1,900 11 240 <10 - 01/25-26/95 48 85 -3703 250 29 1 0 1 8 2 1 -- 04/26-27/95 44 33 -32 51 97 24 074 <0 5 067 -- 07/26/95 4538 -33 56 330 17 6 1 2 3 62 -- 10/25-26/95 4624 -3442 01/25/96 4329 -3147 76 18 <05 <05 055 -- 04/25/96 3864 -2682 07/24/96 3904 -2722 <50 <05 <05 <05 <05 86 10/23/96 4084 -2902 SAMPLED SEMI-ANNUALLY 01/20/97 37 14 -25 32 <50 059 <0 5 <0 5 <05 20 07/16/97 34 71 -2289 <50 <05 <05 <05 <0 5 40 10/15/97 3654 -2472 <50 <05 <05 <05 46 46/636 12/08/97 36 37 -2455 03/05/98 31 98 -2016 <50 <0 50 <0 50 <0 50 <0 50 140/I206 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 331336 I MW-8 04/16/92 - -- NOT SAMPLED 07/30/92 -- -- <50 1 7 <05 <0 5 <05 -- 10/21-22/92 -- - <50 <05 08 <05 <0 5 - 01/13/93 -- <50 <0 5 <05 <05 <0 5 1038 04/26/93 48 80 -3842 120 1 1 <05 <05 <05 -- 07/26/93 4979 -3941 90 06 <0 5 <0 5 <0 5 -- 10/20/93 5028 -3990 92 40 072 076 1 8 01/17-18/94' 47 85 -3747 620 3 9 27 11 48 -- 02/28/94' 4677 -3639 88 <0 5 <05 <0 5 09 -- 04/25-26/94 45 81 -35 43 94 067 1 2 052 24 -- 07/25-26/94 4820 -37 82 170 <05 082 <05 17 -- 10/26-27/94 4933 -38 95 <50 <05 <05 <05 1 3 -- 01/25-26195 4663 -3625 <50 <05 072 <05 14 -- 04/26-27/95 42 13 -31 75 <50 <0 5 <0 5 <0 5 <05 -- 6981 xls/#180138 7 As of 10/14/98