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0 Groundwater Momnnw toand Analytical Results 0 Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL Ib/ DATE BTW I, GWE TPH-G B T E MT13 ITOC*(ft.) Ut) big (ppb) fppb) (ppb) (Ppb) ttiPb (P bf MW-2 10/21-22/92 DRY 51 0-55 0 (cont) 01/13/93 DRY -- 11 56 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 -- 01/17-18/94 4974 -3818 14,000 1,800 31 29 120 04125-26194 4761 -3605 21,000 8,000 240 93 220 -- 07/25-26194 5007 -3851 NOT SAMPLED DUE TO CONSTRUCTION 10126-27/94 5125 -3969 24,000 11,000 3,100 96 3,200 -- 01/25-26195 4849 -3693 8,600 4,100 94 35 130 - 04/26-27195 4388 -3232 11,000 5,300 460 74 530 -- 07/27/95 4495 -3339 3,300 640 26 <12 5 I3 - 10/25-26/95 4584 -3428 01/25/96 4305 -3149 2,100 510 29 <10 11 - 3 04/25/96 3822 -2666 -- -- -- - -- -- 07/24/96 3860 -2704 1,300 470 110 16 75 36 10/23/96 4043 -2887 SAMPLED SEMI-ANNUALLY -- -- -- -- 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 <500/1206 12/08/97 3614 -2458 -- - -- -- -- 03/05/98 3268 -2112 10,000 1,900 <50 150 ]so 280/3006 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 01/25-26199 2843 -1687 2,200 610 21 24 72 270/1706 04/19-20/99 2610 -1454 1,700 440 20 18 57 310/1806 07115-16/99 2737 -1581 620 130 <2 5 51 17 120/1806 1156 10125-26/99 2907 -1751 71013 120 21 60 29 240/2006 01127-28100 2853 -1697 490" 62 20 52 24 170/1406 06/26-27/00 2584 -1428 489" 380 300 <0 500 532 107/87 96 1213 09122-23/00 2901 -1688 8,00016 <20 <20 <20 370 120/1006 6981 xls/#180138 3 As of 63/21/02