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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 USE TAME 1,2-DCA Methanol Number Sampled (Erg/L) (pg/L) (pg/L) (/jg/L) (pg/L) (pg1L) (ug/L) WL) Comments MS-1A 1 211 912 002 NA NA NA NA NA NA — -- 03/06/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 17 — 06/11/2003 <100 <20 055 <1 0 <1 0 <1 0 — - 09/24/2003 <100 <20 051 <1 0 <1 0 <1 0 — 12/10/2003 <100 <20 058 <1 0 <1 0 <1 0 097 <100 03/09/2004 <100 <20 77 <1 0 <1 0 <1 0 087 <100 06/24/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <100 09/20/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 1 1 — 12/20/2004 — — — -- -- — -- — Not Sampled MS-1 B 12/19/2002 NA <200 <0 50 <0 50 <0 50 <0 50 -- — 03/06/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 1 8 06/11/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 -- -- 09/24/2003 <100 <20 062 <1 0 <1 0 <1 0 — — 12/10/2003 <100 <20 057 <1 0 <1 0 <1 0 096 <100 03/09/2004 <100 <20 89 <1 0 <1 0 <1 0 10 <100 06/24/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <100 09/20/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 -- 12/20/2004 -- — — -- — -- — -- Not Sampled MS-2A 12/19/2002 NA <200 079 <0 50 <0 50 <0 50 — — 03/06/2003 <100 <20 061 <0 50 <0 50 <0 50 053 -- 06/11/2003 <100 <20 <0 50 UJ <1 0 <1 0 <1 0 -- — 09/24/2003 <100 <20 062 <1 0 <1 0 <1 0 -- -- 12/10/2003 <100 <20 060 <1 0 <1 0 <1 0 1 1 <100 03/09/2004 <100 <20 38 <1 0 <1 0 <1 0 22 <100 06/23/2004 <100 <20 1 <0 50 1 <0 50 1 <0 50 <0 50 <0 50 <100 09/20/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 075 — 12120/2004 -- — -- — -- — -- — Not Sampled MS-2B 12/19/2002 NA <200 <0 50 <0 50 <0 50 <0 50 -- — 03/06/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 16 06/11/2003 <100 <20 <0 50 UJ <1 0 <1 0 <1 0 — -- 09/24/2003 <100 <20 065 <1 0 <1 0 <1 0 -- - 12/10/2003 <100 22 060 <1 0 <1 0 <1 0 089 <100 03109/2004 1 <100 <20 50 <1 0 <1 0 <1 0 <0 50 <100 Report Date January 31,2005 Page 1 of 13