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T 1 . Groundwater Monitorin a and Analytical Results - Tosco(Unocal) Service Station#5886 2701 West March Lane Stockton,California �V$Ll< I1f�l 115A` t' DTT S I GWE TPH4) TPH-C 13 T $ x MTBE 'tqO *(ft) ON UT,bgs} ORSO OPPN (Ppb) (Pb) (Ppb) (ppb) (ppb) ON I MW-3 02/28-29/00 469 5 0-25 0 -483 "58/ND' ND ND ND ND ND 41,000142,0007 (cont) 05/10-11/00 606 -620 9223/80 269 NDB ND NDS NDS NDS 10101,0001122,0007 08103-04100 680 -694 956 3IND6 ND ND ND ND ND 1628,700/20,9007 1 I/16-17/00 631 -645 12 17260/ND6'7 NDS NDS NDS NDB NDS 12,000111,0007 02/05-06/01 623 -637 952 4/ND6 NDS 19 NDB 19 ND 819 NDS 19 NDS 14 1916,400118,0007 04/30/01 601 -6 15 -- -- -- -- -- 11,8007 05/07-08/01 608 -622 NDS ND ND ND ND ND 10,400111,7007 06/27/01 703 -7 17 -- -- -- -- _- _ 4,600 07/19/0 t 671 -685 -- -- -- -- -- -- 8,700 08120-21101 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 11119-20/01 665 -679 - <50 <0 50 <0 50 <0 50 <0 50 5,800/6,8007 12/13/01 624 -638 - -- -- -- -- -- --/4,000' 01/18/02 5 85 -599 -- -- -- -- -- -- 5,000 02/11-12102 634 -648 <1,000 <10 <10 <10 <10 5,00015,0007 03/21102 6 17 -631 -- -- -- -- -- -- 9,000 05102-03102 631 -645 - <500 <5 0 <5 0 <5 0 <5 0 8,60016,5007 08/01-02/020 667 -681 -- <1,000 <10 <10 <10 <20 1,200 11120-21!0220 653 -667 -- <250 <2 5 <2 5 <2 5 <5 0 280 02120-21/0320 6 36 -650 -- 14021 <0 50 <0 50 <0 50 <1 0 I50 05107-08/0320 568 -582 -- <50 <0 50 <0 50 <0 50 <1 0 130 MW-4S -025 05/02/97 714 5 0-15 0 -739 ND ND ND ND ND ND ND 09/02/97 934 -959 ND ND ND ND ND ND ND 12/01/97 775 -800 ND ND ND ND ND ND ND 03/25/98 590 -6 15 ND ND ND ND ND ND 79/727 06/17/98 685 -710 ND6 ND ND 079 ND 067 12/12 7 09/01/98 764 -789 ND ND ND ND ND ND ND/8 07 5886 xls/#180137 4 As of 05/08/03