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Table • Groundwater Monitoring Dd Analytical Results Tosco(Unocal) Service Station#5886 2701 West March Lane Stockton,Caltfomia - WELL IDI DATE DTW sl GWE TPH-D TPI-G 8 T E X MTBE TOC*(ft) 00 (ft bgs) (ms!) (ppb) (pp b) (pp b) pb) (ppb) (ppb) (ppb) I MW-2 06/27/01 678 5 0-25 0 -708 -- -- - -- -- -- 1,900 (cont) 07/19/01 668 -698 -- -- -- -- -- -- 1,100 08120-21101 702 -732 <50 <50 <0 50 <0 50 <0 50 <0 50 3,70013,600 09/13/01 699 -729 -- -- -- -- -- 1,700 10/19/01 702 -732 -- -- -- -- -- -- 2,600 11119-20/01 657 -687 -- <50 <0 50 <0 50 <0 50 <0 50 3,500/4,0007 12/13/01 6 18 -648 - -- -- -- -- -- --16,5007 01/18/02 569 -599 -- -- -- -- -- 7,200 02/11-12102 622 -652 <1,000 <10 <10 <10 <10 4,800/4,600' 03/21/02 605 -635 -- -- -- -- -- 150 05/02-03/02 6 15 -645 -- <50 <0 50 <0 50 <0 50 <0 50 41/287 08101-02/0220 658 -689 -- <100 <1 0 <1 0 <1 0 <2 0 200 11/20-21/02 21 643 -673 <250 <2 5 <2 5 <2 5 <5 0 290 02/20-2110320 623 -653 -- <50 <0 50 <0 50 <0 50 <1 0 28 05107-0810320 551 -5 81 -- <50 <0 50 <0 50 055 <1 0 150 08/04-05/03Z0 666 -696 -- 682E <0 50 <0 50 <0 50 <10 120 MW-3 -014 09/06/96 8 16 5 0-25 0 -830 -- -- -- -- -- -- -- 09/09/96 8 10 -824 130' ND ND ND ND ND 4,100 12/06/96 669 -683 68 ND ND ND ND ND 660 03/07/97 598 -612 1203 ND ND ND ND ND 16,000120,0007 -065 05/02/97 660 -725 120' ND 32 ND ND ND 7,90018,000 09/02/97 856 -921 ND ND ND ND ND ND 2,100 12/01/97 705 -770 ND ND8 ND ND' ND' NO 1,700 03/25/98 526 -591 ND NO NDB NDS NDB NDB 8,20018,5007 06/17/98 608 -673 NDS NDS NDS ND' NDB NW 6,20017,3007 09/01/98 687 -752 978/ND6 ND ND ND ND ND 6,700/4,5007 12/03/98 633 -698 ND' NO NO NO NDB NDB 4,400/5,0007 03/01/99 555 -620 NDB ND ND ND ND ND 27,000/31,0007 -014 ** 04/19/99 607 -621 -- -- -- __ __ __ -- 06/01-02/99 673 -687 ND NO NO NO NO NDB 36,000/36,0007 5886 xls/#180137 3 As of 08/05/03