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Table 2 Fue{ 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 (pglL) (pglL) (ug1L) (pglL) (ug1L) (ug1L) (pg1L) (pgIL) Comments VW-5 09/24/2003 <100 <20 <0.50 <1.0 <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 31 <100 06/24/2004 <500 <100 <2.5 <2.5 <2.5 <2.5 220 <100 09/20/2004 <1,000 <200 <5.0 <10 <10 <10 140 - 12/21/2004 <500 <100 3.8 <5.0 <5.0 <5.0 620 J - 03/27/2005 <1,000 <200 <5.0 00 <10 <10 170 VW-6 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-7 12/19/2002 NA 77 11 <0.50 <0.50 <0.50 -- 03/06/2003 <100 83 11 <5.0 <5.0 <5.0 320 -- 06/11/2003 <100 <20 0.54 <1.0 <1.0 <1.0 -- - 09/24/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 - -- 12/10/2003 <500 <100 9.1 <5.0 <5.0 <5.0 160 <100 03/08/2004 <500 <100 6.3 <5.0 <5.0 <5.0 64 <100 06/24/2004 <100 <20 1.1 <0,50 <0.50 <0.50 16 <100 09/20/2004 <100 <20 1.2 <1.0 <1.0 <1.0 20 -- 12/20/2004 <100 100 13 <1.0 <1.0 <1.0 210 J - 03/28/2005 0,000 <200 9.5 <10 <10 <10 280 - VW-8 12/19/2002 NA <10 <1.0 <1.0 <1.0 <1.0 -- -- 03/06/2003 <500 <20 1.0 <2.5 <2.5 <2.5 6.0 -- 06/11/2003 <500 <100 <2.5 <5.0 <5.0 <5.0 - - 09/24/2003 <1,000 <200 <5.0 <10 <10 <10 - -- 12/10/2003 <100 <20 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 - 12/21/20D4c200 <5.0 <10 <10 <10 50 - Report Date:ApHI 25, 2005 Page 11 of 14