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Table 2 I Fuel Oxygenates Analytical Data ARCO Service Station No 2130 7906 N EL Dorado Street, Stockton, CA Well Date Ethanol TBA MtBE DIP EtBE TAME 1,2-DCA Methanol Number Sampled (Erg/L) (pg/L) (pg/L) (pg/L) (pgA) (pg/L) (pglL) (pgA-) Comments VW-9 09/20/2004 - Well Dry,Not Sampled 12/20/2004 - Not Sampled Well Dry 03/28/2005 - 06/19/2005 09/11/2005 Well Dry,Not Sampled 12!1112005 — — — — — — — — Not Sampled,Well Dry VW-10 12/19/2002 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 <25 <5 0 <5 0 <50 <2 5 <100 06/24/2004 <500 <100 28 <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 06/19/2005 <2,500 <500 <12 <12 <12 <12 <12 09/11/2005 <2,500 <500 <12 <12 <12 <12 <12-- 12/1112005 1212/11/2005 <5,000 <1,000 <25 <25 <25 <25 <25 VW-11 12/19/2002 1 NA <50 098 <0 50 <0 50 <0 50 - 03/06/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 27 06/11/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 - 09/24/2003 <100 <20 80 <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 <106 09/20/2004 <100 <20 063 <1 0 <1 0 <1 0 53 - 12/20/2004 <100 <20 069 <1 0 <1 0 <1 0 45 03/28/2005 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 - 06/20/2005 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 09/12/2005 <100 <20 <0 50 <0 50 <0 50 <0 50 064 12/11/2005 <5,000 <1,000 <25 <25 <25 <25 <25 -- VW 12 12/19/2002 NA <20D 2 6 <0 50 <0 50 <0 50 Report Date January 25,2006 Page 14 of 16 I