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Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No. 2130 7906 N. EL Dorado Street, Stockton, CA Well Date Ethanol TBA MtBE DIPE ELBE TAME 1,2-DCA Methanol Number Sampled (pg/L) (pg/L) (pglL) (pg/L) (pg1L) (pg1L) (pg/L) (pg/L) Comments MS-1A 12/19/2002 NA NA NA NA NA NA - - 03/06/2003 <100 <20 <0,50 <0.50 <0.50 <0.50 1.7 - 06/11/2003 <100 <20 0.55 <1.0 <1.0 <1.0 -- - 09/24/2003 <100 <20 0.51 <1.0 <1.0 <1.0 -- - 12/10/2003 <100 <20 0.58 <1.0 <1.0 <1.0 0,97 <100 03/09/2004 <100 <20 7.7 <1.0 <1.0 <1.0 0.87 <100 06/24/2004 <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 1.1 - 12/20/2004 - -- - - -- - -- - Not Sampled 03/29/2005 <100 <20 <0.50 <1.0 <1.0 <1.0 0.79 -- MS-1B 12!1912002 NA <200 <0.50 <0.50 <0.50 <0.50 - - 03/06/2003 <100 <20 <0.50 <0.50 <0.50 <0.50 1.8 -- 06/11/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 - - 09/24/2003 <100 <20 0.62 <1.0 <1.0 <1.0 -- - 12/10/2003 <100 <20 0.57 <1,0 <1.0 <1.0 0.96 <100 03/09/2004 <100 <20 8.9 <1.0 <1.0 <1.0 1.0 <100 06/24/2004 <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,D <0.50 -- 12/20/2004 - - - - -- -- -- - Not Sampled 03/29/2005 <100 <20 <0.50 <1.0 <1.0 <1.0 <0.50 -- MS-2A 12/19/2002 NA <200 0.79 <0.50 <0.50 <0.50 -- -- 03/06/2003 <100 <20 0.61 <0.50 <0.50 <0.50 0.53 -- 06/11/2003 <100 <20 <0.50 UJ <1.0 <1.0 <1.0 -- -- 09/24/2003 <100 <20 0.62 <1.0 <1.0 <1.0 -12/1012003 <100 <20 0.60 <1.0 <1.0 <1.0 1.1 <100 03/09/2004 <100 <20 3.8 <1.0 <1.0 <1.0 2.2 <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 0.75 -- 12/20/2004 -- -- -- -- -- - -- - Not Sampled 03/2912005 <100 <20 <0.50 <1.0 <1.0 0.0 0.83 -- MS-26 12/19/2002 NA <200 <0.50 <0.50 <0.50 <0.50 - - 03/06/2003 <100 <20 <0.50 <0.50 <0.50 <0.50 1.6 -- 06/11/2003 <100 <20 <0.50 UJ <1.0 <1.0 <1.0 - - Report Date:April 25,2005 Page 1 of 14