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Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No 2186 3212 N California Street, Stockton, CA I Well Date Ethanol TBA MtBE DIPE EtBE TAME 1,2-DCA EDB Methanol Number Sampled WIL) (, g/L) (pglL) (41L) (ugll-) (pg/L) (Ng/L) (lrg1L) (1rg1L) Comments VW-213 06/09/2003 <2,000 <400 810 <20 <20 <20 <10 - 09/17/2003 <1,000 <200 90 <10 <10 <10 55 -- 12/11/2003 <500 <100 170 <5 0 <5 0 <50 41 — 03/10/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 -- — 06/17/2004 <500 <100 210 <5 0 <5 0 <50 34 — <100 09/23/2004 <500 <100 79 <5 0 <5 0 <50 51 <2 5 <100 12121/2004 <2,500 630 460 <25 <25 <25 21 <12 <100 03/30/2005 <200 <40 43 <2 0 <2 0 <2 0 <1 0 <1 0 -- 06/13/2005 <100 <20 17 <0 50 <0 50 <0 50 091 <0 50 -- 09/08/2005 <100 1 <20 52 1 <0 50 <0 50 <0 50-- 11 1 20 -- VW-3A 03/11/2003 — -- _ _. _ _ — _ -- Not Sampled 06/09/2003 -- -- — — — — — — — Well Dry 09/17/2003 — -- -- _ _ _ __ — - Well Dry 12/11/2003 - — -- -- - - — -- -- Not Sampled 03/10/2004 -- -- — — — - — — Not Sampled 06/17/2004 -- -- -- -- — — Not Sampled,Well Dry 09/23/2004 -- — -- -- — - — -- Not Sampled,Well Dry 12/21/2004 — — - — -- — - — Insufficient Water,Not Sampled 03/30/2005 — — -- — -- -- -- -- 06/13/2005 - -- - — -- -- — — Insufficient Water,Not Sampled 09/08/2005 -- -- -- -- — -- — -- — Not Sampled, Insufficient Water VW-313 11/20/1997 -- <100 <2 0 <2 0 <20 <2 0 — - - No FP,No S 2/17/1998 — NA NA NA NA NA — — -- No FP,No S 6/24/1998 — <200 <2 0 <2 0 <20 <2 0 -- -- - No FP,No S 9/21/1998 310 235 <2 0 <2 0 <2 0 — — — No FP,No S 12/14/1998 -- <200 432 <2 0 <2 0 511 -- — -- No FP,No S 3/31/1999 - <200 <2 0 <2 0 <2 0 <2 0 — -- — No FP, No S 6/11/1999 -- <200 548 <20 <2 0 <20 — -- No FP,No S 9/10/1999 -- <1,000 1,500 <10 <10 123 -- — No FP,No S 12/3/1999 <200 262 <20 <2 0 208 — - -- No FP,No S 4/3/2000 — <200 252 <20 <2 0 <20 — — -- No FP,No S 6/22/2000 -- <200 3180 <20 <2 0 23 -- — — No FP,No S 9/27/2000 - NS NS NS NS NS — — -- No FP,No S Report Date October 17, 2005 Page 8 of 10