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Tal and Analytical Results Groundwater Monitoring . Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL IDI DATE DTW ST GWE TPH-G B T E X MTBE TOC*(ft) (ft) (ft bgs) (ft) (ppb) (Ppb) (ppb) (ppb) (ppb) (ppb) MW-2 10121-22192 DRY 51 0-550 (cont) 01/13/93 DRY 1156 04/26/93 5072 -3916 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 _- 01/17-18194 4974 -38 18 14,000 1,800 31 29 120 -- 04/25-26194 4761 -360-5 21,000 8,000 240 93 220 07125-26194 5007 -3851 NOT SAMPLED DUE TO CONSTRUCTION 10126-27194 5125 -3969 24,000 11,000 3 100 96 3,200 -- 01/25-26195 4849 -3693 8,600 4,100 94 35 130 -- 04/26-27/95 4388 -3232 11,000 5,300 460 74 530 -- 07/27/95 4495 -3339 3,300 640 26 <12 5 13 -- 10/25-26195 4584 -3428 01/25/96 4305 -3149 2 100 510 29 <10 I I --' 04/25/96 3822 -2666 07/24/96 3860 -2704 1 300 470 110 16 75 36 10/23/96 404-1 -2887 SAMPLED SEMI-ANNUALLY -- - -- -- 01/21/97 3693 -2537 250 72 11 45 16 18 07/17/97 3424 -2268 16,000 3,900 220 180 390 <250 10/16/97 1608 -2452 12,000 3,500 200 170 640 <500/1206 12/08/97 3614 -2458 - - -- - -- - 03/05/98 3268 -21 12 10,000 1,900 <50 150 ISO 2801300E 05/27/98 2931 -1775 8,600 1,400 18 56 65 47/270' 07/21/98 2831 -1675 490 85 56 29 24 2201180" 10/14198 2926 -1770 2,900 620 17 36 56 380/190" 01/25-26/99 2843 -1687 2,200 610 21 24 72 270/1706 04119-20199 2610 -1454 1,700 440 20 18 57 310/180 07115-16/99 2737 -1581 620 130 <25 51 17 1201180' 1156 10125-26/99 2907 -1751 710" 120 21 60 29 240/2006 01127-28/00 2853 -1697 490"° 62 20 52 24 170/140' 06126-27100 2584 -1428 489" 390 300 <0 500 532 107187 96 1213 09122-23/00 2901 -1688 8,000" <20 <20 <20 370 120/100" 6981 x1s/#180138 3 As of 09/30/02