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Table 2 - Fuel Oxygenates Analytical Data - ARCO Service Station No.-21-30 7906 N. EL Dorado Street, Stockton, CA Well Date Ethanol TBA MtBE DIPS EtBE TAME 1,2-DCA Methanol Number Sampled (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) WIL) (pg/L) Comments VW-2 .0612412004, <100 <20 1.0 -<0.50 - <0.50 <0.50 -16 <100 _.� 0912012004. .. .. <100 <20 .... <0.50w.: _. <1.0.,..x.. .>. : <1.0 _. .. <1.0 _ 32 - -- 12/21/2004 <100 <20 <0.50 <1.0 <1.0 <1.0 25 -- 03/27/2005 <500 <100 <2.5 <5.0 <5.0 <5.0 15 - 06119/2005 <10011J <20 <0.50 <0.50 <0.50 <0.50 7.0 -- 09/111200+5 <100 <20 <0.50 <0.50 <0.5D <0.50 3.6 - VW-3 12/19/2002 NA <0.50 8.9 <0.50 <0.50 <0.50 -- 03/06/2003 <100 <20 14 <0.50 <0.50 <0.50 1.3 - 06/11/2003 <100 <20 2.6 <1.1} <1.0 <1.0 -- - 09/24/2003 <100 <20 5.4 <1.0 <1.0 <1.0 - 12/1012003 <100 <20 5.0 <1.0 <1.0 <1.0 2.0 <100 03/08/2004 <100 <20 191 <1.0 0.0 <1.0 13 J <1,500 06/24/2004 <100 <20 <0.50 <0.50 <0.50 <0.50 <0.50 <100 09/20/2004 <100 <20 4.4 <1.0 <1.0 <1.0 0.82 - 12/20/2004 <100 X20 0.69 <1.0 <1.0 <1.0 1.4 -- 03/28/2005 <100 <20 1.9 <1.0 <1.0 <1.0 <0.50 -- 06/19/2005 <100 <20 1.4 J <0.50 <0.50 <0.50 0.50 -- 09111/2005 <100 <20 1.0 <0.50 <0.50 <0.50 1.2 -- VW-4 12/19/2002 NA <0.50 <0.50 <0.50 <0.50 <0.50 - - 03/06/2003 <100 <20 <0.50 <0.50 <0.50 <0.50 15 06/11/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 -- -- 09/24/2003 <100 <20 4.5 <1.0 <1.0 <1.0 -- 12/10/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 1.2 <100 03/08/2004 <100 <20 4.6 <1.0 <1.0 <1.0 <0.50 <100 06/24/2004 <100 <20 <0.50 <0.50 <0.50 <0.50 51 <100 09/20/2004 <100 <20 <0.50 <1.0 <1.0 <1.0 2.9 -- 12/20/2004 <100 <20 <0.50 <1,0 <1.0 <1.0 5.6 - 03/27/2005 <100 <20 <0.50 <1.0 <1.0 <1.0 5.2 - 06/19/2005 <100 <20 <0.50 <0.50 <0.50 <0.50 1.3 -- 09/11/2005 <100 <2D <0.50 <0.50 <0.50 <0.50 1.1 -- VW-5 12/19/2002 NA 16 6 0.67 <0.50 <0.50 - - 03/06/2003 <2,000 <400 5.1 0.91 <10 <10 660 -- 06/11/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 -- -- Report Date:October 21,2005 Page 11 of 15