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T le 1 Groundwater Monitore to and Analytical Results Former Tosco(Unoca) Service Station#6981 4707 Pacific Avenue Stockton, California WELL ID/ DATE DTW S.1. GWE TPH-G B T E X MTBE TOC}(f&) (ft.) (ft bgs) (ft) - (ppb) (ppb) (ppb) (Ppb) (ppb) (ppb) 11/14/91 DRY 04/16/92 DRY MW-2 07/30/92 DRY 51 0-55 0 (cont) 10/21-22/92 DRY 01/13/93 DRY -- -- ._ -- -- 1156 -1156 04/26/93 5072 -39 16 43,000 8,000 <125 <125 <125 -- 07/26/93 5172 4016 18,000 2,900 47 38 90 -- 10/20/93 5226 -4070 12,000 2,400 52 <20 60 -- 01/17-18/94 4974 -38 18 14,000 1,800 31 29 120 -- 04/25-26/94 4761 -3605 21,000 8,000 240 93 220 -- 07/25-26/94 5007 -38 51 NOT SAMPLED DUE TO CONSTRUCTION -- -- 10/26-27/94 5125 -3969 24,000 11,000 3,100 96 3,200 -- 01/25-26/95 4849 -3693 8,600 4,100 94 35 130 -- 04/26-27/95 43 88 -3232 11,000 5,300 460 74 530 -- 07/27/95 4495 -3339 3,300 640 26 <12 5 13 10/25-26/95 45 84 -3428 -- -- -- _- __ 01/25/96 4305 -3149 2,100 510 29 <10 11 -s 04/25/96 3822 -2666 -- -- -- _- -- -- 07/24/96 3860 -2704 1,300 470 110 16 75 36 10/23/96 4043 -2887 SAMPLED SEMI-ANNUALL -- -- -- -- 01/21/97 3693 -2537 250 72 13 45 16 18 07/17/97 3424 -2268 16,000 3,900 220 180 390 <250 10/16/97 3608 -2452 12,000 3,500 200 170 640 <500/120' 12/08/97 36 14 -2458 -- -- -- -- -- -- 03/05/98 3268 -21 12 10,000 1,900 <50 150 180 280/3005 05/27/98 2931 -1775 8,600 1,400 18 56 65 47/2706 07/21/98 2831 -1675 490 85 56 29 24 220/1806 10/14/98 2926 -1770 2,900 620 17 36 56 380/1906 01/25-26/99 2843 -1687 2,200 610 21 24 72 270/1706 04/I9-20/99 2610 -1454 1,700 440 20 18 57 310/1806 07115-16/99 2737 -15 81 620 130 <2 5 5 I 17 120/1805 11 56 10/25-26/99 2907 -1751 71013 120 21 60 29 240/2006 6981 xls/#180138 3 As of 06/26/03