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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 DIPS EtBE TAME 1,2-DCA Methanol Number Sampled WWI-) (p91L) (pg/L) (pg/L) (pg1L) (pg/L) (srg1L) (ug1L) Comments 1AW-10 09/25/2003 -- — — — -- — — -- Well Destroyed VW-1 12/19/2002 NA 45 64 <0 50 <0 50 <0 50 — — 03/06/2003 <100 34 25 <0 50 <0 50 <0 50 18 -- 06/11/2003 <100 <20 84 <1 0 <1 0 <1 0 -- -- 09/24/2003 <100 <20 87 <1 0 <1 0 <1 0 -- 12/10/2003 <100 37 13 <1 0 <1 0 <1 0 35 <100 03/08/2004 <100 <20 191 <1 0 <1 0 <1 0 1 3 J <1,500 UJ 06/24/2004 <1,000 <200 <5 0 <5 0 <50 <5 0 470 <100 09/20/2004 <5,000 <1,000 27 <50 <50 <50 <25 — 12/20/2004 <100 <20 13 <1 0 <1 0 <1 0 23 03/28/2005 <100 22 98 <1 0 <1 0 <1 0 064 06119/2005 <500 UJ <100 4 8 J <2 5 <2 5 <2 5 <2 5 VW-2 12/19/2002 NA <0 50 <0 50 054 <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 <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 28 <100 06/24/2004 <100 <20 10 <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 03/27/2005 <500 <100 <2 5 <50 <50 <5 0 15 -- 06/19/2005 <100 UJ <20 <0 50 <0 50 <0 50 <0 50 70 -- VW-3 12!1912002 NA <0 50 89 <0 50 <0 50 <0 50 — — 03/06/2003 <100 <20 14 <0 50 <0 50 <0 50 13 — 06/11/2003 <100 <20 26 <1 0 <1 0 <1 0 — -- 09/24/2003 <100 <20 54 <1 0 <1 0 <1 0 - -- 12/16/2003 <100 <20 50 <10 <10 <10 20 <100 03/08/2004 <100 <20 191 <1 0 <1 0 <1 0 1 3J <1,500 06/24/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <100 09!2012004 <100 <20 44 <1 0 <1 0 <1 0 082 - 12120/2004 <100 <20 069 <1 0 <1 0 <1 0 14 -- 03/28/2005 <100 <20 -.19 <1 0 <1 0 <1 0 <0 50 - ReportDate July 27,2005 Page 10 of 14