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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) (pg1L) (pg1L) (1rg1L) ({rglL) (pg/L) (pg1L) (pg1L) Comments VW:5 0912412003 <100:.. <20 <0.50 <1.0 <1:0 <1.0:.. 12/10/2003 ..;, .<100. , <0.50 <1 . . . . _ .. <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 - 12121/2004 <500 <100 3.8 <5.0 <5.0 <5.0 620 J -- 03/27/2005 <1,000 <200 <5.0 <16 <10 <10 170 - 06/19/2005 <100 <20 3.4 J 1.2 <0.50 <0.50 100 09111/2006 <200 <40 3.1 <1.0 <1.0 <1.0 110 -- 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 03/28/2005 - - -- - 06/19/2005 -- 09111/2005 -- -- - -- -- -- -- -- 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 X500 <100 9.1 <5.0 <5.0 <5.0 160 <10D 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 - 12/2012004 <100 100 13 <1.0 <1.0 <1.0 210 J' -- 03/28/2005 <1,000 <200 9.5 <10 <10 <10 280 - 06/20/2005 <100 25 3.0 J <0.50 <0.50 <0.50 72 09/12/2005 <100 <20 0.93 <0.50 <0.50 <0.50 15 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 -- - Report Date:October 21,2005 Page 12 of 15