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Table 2 Fuel Oxygenates Analytical Data ARCO Service Station-No' '21,30. 7906 21.30 -7906 N. EL Dorado Street, Stockton, CA Well Date ,. Ethanol TBA MtBE DIPS ELBE TAME 1,2-DCA Methanol Number Sampled (pg/L) (pg1L) (pglL) (pg/L) (pg/L) (pglL) (pglL) WIL) Comments -MS-36 - 06/24/2004 <500 <100 <2:5°- ,_ <2:5 <2.5 <2.5 120 <100 - .. 09/20/2004. ::- - .<500, <100..::.:.: <2.5 - <5.0 . :.. . . <5.0 .... . <5.0 <2.5,, _.. . ,. 12/20/2004 - - - - - -- - - Not Sampled 03/28/2005 3,500 <20 33 <1.0 <1.0 <1.0 <0.50 - 06120l2005 <100 <20 36 <0.50 <0.50 <0.50 <0.50 -- 09/1112005 <100 UJ <20 UJ 38 J <0.50 UJ <0.50 UJ <0.50 UJ <0.50 UJ -- MW-1 11/19/1997 NA NA NA NA NA NA -- - 3/5/1998 NA <100 <2 <2 <2 <2 NA -- 6/26/1998 NA <100 <2 <2 <2 <2 9/1/1998 NA <100 <2 <2 <2 <2 --12/211998 NA <200 <2 <2 <2 <2 -- -- 3/31/1999 NA <200 <2 <2 <2 <2 - -- 6/4/1999 NA <200 <2 <2 <2 <2 - -- 9/2/1999 NA <200 <2 <2 <2 <2 -- -- 11l2911999 NA <200 <2 <2 <2 <2 -- 3/16/2000 NA <200 <2 <2 <2 <2 -- - 6/26/2000 NA <100 <2 <2 <2 <2 9/28/2000 NA <200 <2 <2 <2 <2 12119/2000 NA <200 <2 <2 <2 <2 - - 3/15/2001 NA <200 <2 <2 <2 <2 _ 6/20/2001 NA <100 <2 <2 <2 <2 9112/2001 NA <200 <2 <2 <2 <2 -- - 12/12/2001 NA <5.0 0.54 <0.50 <0.50 <0.50 -- -- 3/13/2002 NA <5.0 <0.50 <0.50 <0.50 <0.50 - -- 6/18/2002 NA <5.0 <0.50 <0.50 <0.50 <0.50 - - 9111/2002 NA <5.0 <0.50 <0.50 <0.50 <0.50 -- 1 211 8/2 0 0 2 NA <5.0 <0.50 <0.50 <0.50 <0.50 - -- 03/06/2003 <100 <20 <0.50 <0.50 <0.50 <0.50 <0.50 -- 06/11/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 - - 09/23/2003 <100 <20 <0.50 <1.0 <1.0 0.0 -- - 12/09/2003 <100 <20 <0.50 <1.0 <1.0 <1,0 <0.50 <100 03/09/2004 <100 <20 <0.50 0.0 <1.0 <1.0 <0.50 <100 06/23/2004 <100 <20 <0.50 <0.50 <0.50 <0.50 <0.50 <100 09/20/2004 <100 <20 <0.50 <1.0 <1.0 <1.0 Report Date:October 21,2005 Page 3 of 15