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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 EtBE TAME 1,2-DCA Methanol Number Sampled (pg/L) (pglL) (pg1L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) Comments VW-8 03/27/2005 <5,000 <1,000 <25 <60 <50 <50 <25 -- VW-9 03/06/2003 - - - - -- - - _ 12/10/2003 -- - - - -- - -- -- Well Dry 03/08/2004 -- -- -- -- -- -- - - Well Dry 06/23/2004 - - - -- ~ - - Well Dry,Not Sampled 09/20/2004 -- - - -- -- - - - Well Dry,Not Sampled 12/20/2004 - - -- -- - -- -- -- Not Sampled,Well Dry 03/2812005 VW-10 12!1912002 NA <100 <10 <10 <10 <10 -- -- 03/06/2003 <10,000 <2,000 <50 <50 <50 <50 <50 - 06/11/2003 <5,000 <1,000 <25 <50 <50 <50 - - 09/24/2003 <1,000 <200 <5.0 <10 <10 <10 -- -- 12/10/2003 <1,000 <200 <5.0 <10 <10 <10 97 <100 03/08/2004 <500 <100 <2.5 <5.0 <5.0 <5.0 <2.5 <100 06/24/2004 <500 <100 2.8 <2.5 <2.5 <2.5 290 <100 09/20/2004 <500 <100 <2.5 <5.0 <5.0 <5.0 <2.5 - 12/21/2004 <10,000 UJ <2,000 UJ <50 UJ <100 UJ <100 UJ <100 UJ <50 UJ -- 03/2712005 <10,000 <2,000 <50 <100 <100 <100 <50 - VW-11 12/19/2002 NA <5.0 0.98 <0.50 <0.50 <0.50 -- - 03/06/2003 <100 <20 <0.50 <0.50 <0.50 <0.50 2.7 - 06/11/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 - -- 09/24/2003 <100 <20 8.0 <1.0 <1.0 <1.0 -- -- 12/10/2003 <100 34 12 <1.0 <1.0 <1.0 2.3 <100 03/08/2004 <100 <20 20 J <1.0 <1.0 <1.0 1.3 J <500 06/23/2004 <100 <20 <0.50 <0.50 <0.50 <0.50 <0.50 <100 09/20/2004 <100 <20 0.63 <1.0 <1.0 <1.0 5.3 - 12/20/2004 <100 <20 0.69 <1.0 <1.0 <1.0 4.5 - 03/28/2005 <100 <20 <0.50 <1.0 <1.0 <1.0 <0.50 VW-12 12/19/2002 NA <200 2.6 <0.50 <0.50 <0.50 -- - 03/06/2003 <100 <20 0.98 <0.50 <0.50 <0.50 310 - 06/11/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 - -- 09/24/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 - -- Report Date:Apr!!25,2005 Page 12 of 14