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Ta 1 . Groundwater Monitoring and Analytical Results • Tosco(Unocal)Service Station#5886 2701 West March Lane Stockton,California IWl~LL ID/ DAn DTW s I GWE TPH-D TPP G S T E X MTBE TOC* (ft) Ur hgs) ("nsl) (Ppb) (ppb) (Ppb) (ppb) (ppb) (Ppb) (Ppb) MW-3 -014 09/06/96 8 t6 9 0-25 0 -830 -- -- -- 09/09/96 810 -824 1301 ND ND ND ND ND 4,100 12/06/96 669 -683 68 ND ND ND ND ND 660 03/07/97 598 -612 1201 ND ND ND ND ND 16,000/20,000 -065 05/02/97 660 -725 1204 ND 32 ND ND ND 7,900/8,000 09/02/97 856 -921 ND ND ND ND ND ND 2,100 12/01/97 705 -770 ND NDA NO NDR NDA NDA 1,700 03/25/98 526 -591 ND NDA NDA NDA NDA NDR 8,20018,5007 06/17/98 608 -673 ND NDR NDA NDA NDA NDR 6,20017,3007 09/01/98 687 -752 9781ND6 ND ND ND ND ND 6,70014,5007 12/03/98 633 -698 ND NDA NDA NDA NDA NDR 4,40015,0007 03/01/99 555 -620 NDA ND ND ND ND ND 27,000/3 1,0W -014 ** 04/19/99 607 -621 - -- -- - -- - -- 06/01-02199 673 -687 ND NDA NDR NDR NDR NDR 36,000/36,0007 08/16-17/99 693 -707 1273/ND' NDA NO NDR NDR NO 20,000/17,0007 11129-30199 684 -698 1278/ND6 NO NDA NO NDA NDA 16,000/21,0007 02/28-29/00 469 -483 1458/ND6 ND ND ND ND ND 41,000/42()007 05110-11100 606 -620 9223180 26 9 NDA NO NDR NDA NDR 16101,000/122,0007 08103-04/00 680 -694 956 3/ND6 ND ND ND ND ND 1628,700/20,900 11/16-17100 631 -645 12 972601ND6 17 NDA NDR NDA NDR NDA 12,000/1 1,0W 02/05-06/01 623 -637 952 4/ND' NDA 19 NDR 19 NDR 19 NO 19 NDA 19 1916,400118,0007 04/30/01 601 -615 -- -- -- -- -- -- 11,800' 05/07-08101 608 -622 NDA ND ND ND ND ND 10,400/11,7007 06/27/01 703 -7 17 -- -- - -- - 4,600 07/19/01 671 -685 -- -- -- -- -- -- 8,700 08120-21/01 708 -722 <50 <50 <0 50 <0 50 <0 50 <0 50 8,300/5,2007 09/13/01 697 -711 -- -- -- -- -- -- 2,300 10/19/01 706 .720 -- -- -- -- -_ -- 2,800 11/19-20/01 665 -679 -- <50 <0 50 <0 50 <0.50 <0 50 5,800/6,8067 5886 xis/#180137 3 As of 11/20/01