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3 Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No. 2130 7906 N, EL Dorado Street, Stockton, CA Well Date Ethanal TBA MtBE DIPE EtBE TAME 1,2-DCA Methanol Number Sampled (pg/L) (pglL) (pglL) (pglL) WIL) (pg/L) (pg/L) (pg/L) Comments VW-2 12/19/2002 NA <0.50 <0.50 0.54 <0.50 <0.50 - 03/06/2003 <100 <20 <0.50 <0.50 <0.50 <0.50 22 - 06/11/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 - -- 09/24/2003 <100 <20 <0.50 0.0 <1.0 <1,0 - 12/10/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 48 <100 03/08/2004 <100 <20 <0.50 <1.0 <1.0 <1.0 28 <100 06/24/2004 <100 <20 1.0 <0.50 <0.50 <0,50 16 <100 09/20/2004 <100 <20 <0.50 <1,0 <1.0 <1.0 32 -- 12/21/2004 <100 <20 <0.50 <1.0 <1.0 <1.0 25 -- 03127/2005 <500 <100 <2.5 <5.0 <5.0 <5.0 15 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 <1.0 <1.0 <1,0 - -- 09/24/2003 <100 <20 5.4 <1,0 <1.0 <1.0 - - 12/10/2003 <100 <20 5.0 <1.0 <1.0 0.0 2.0 <100 03/08/2004 <100 <20 191 <1.0 <1.0 <1.0 1.3 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 <20 0.69 <1.0 <1.0 <1.0 1.4 - 03128/2005 <100 <20 1.9 <1.0 <1.0 <1.0 <0.50 -- VW-4 12!1912002 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 -- 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 0.0 <1,0 <1,0 -- - Report Date:April 25,2005 Page 10 of 14