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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 (pg1L) (pg/L) (pglL) (pg1L) (pg/L) (pg/L) (pg/L) (pg1L) Comments VW-8 09/24/2003 <1,000 .. <200. . <5.0 <10 <10 <10 .�.12110/2003. ..<100 <24 :.._ ::. . ...4.9 .. <1.0; <1.0. _<1.0-. 1.9- „ .<100 . - 03/08/2004 <500 <100 <2.5 <5.0 _<5.0 <5.0 <2.5 <200 06/24/2004 <500 <100 2.8 <2.5 <2.5 <2.5 300 <100 09/20/2004 <10,000 <2,000 <50 <100 <100 <100 <50 -- 12/21/2004 <1,000 <200 <5.0 <10 <10 <10 50 -- 03/27/2005 <5,000 <1,000 <25 <50 <50 <50 <25 06/19/2005 <2,500 <500 <12 <12 <12 <12 <12 -- 09l1112005 <2,500 <500 <12 <12 <12 <12 <12 -- VW-9 03/06/2003 -- - -- -- -- -- -- 12/1012003 - -- -- - - - - - Well Dry 03/08/2004 -- -- - - - w - - Well Dry 06/23/2004 -- - - -- -- -- -- -- Well Dry,Not Sampled 09/20/2004 -- - -- - - -- -- -- Well Dry, Not Sampled 12/20/2004 -- -- - -- -- -- - Not Sampled,Well Dry 03/28/2005 - -- -- -- - - - 06/19/2005 0911112005 -- - - - - - -- - Well Dry,Not Sampled VW-10 12/19/2002 NA <100 <10 <10 <10 <10 -- - 03/06l2003 <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 12/1012003 <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 - 03/27/2005 <10,000 <2,000 <50 <100 <100 <100 <50 96/19/2005 <2,500 <500 <12 <12 <12 _<12 <12 - 09/11/2005 <2,500 <500 <12 <12 <12 <12 <12 - 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 - -- Report Date:October 21, 2005 Page 13 of 15