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<br /> Table 2
<br /> Fuel Oxygenates Analytical Data
<br /> ARCO Service Station No 2186
<br /> 3212 N California, Stockton, CA
<br /> Well Date Ethanol TBA MtBE DIPE ELBE TAME 1,2-DCA EDB PCE Methanol
<br /> Number Sampled (pg/L) (pg1L) WIL) (pg/L) (pg1L) (pg/L) (pg1L) (pg/L) (pg/L) (pg/L) Comments
<br /> MW-1 11/20/1997 -- <100 78 <2 0 <2 0 <2 0 — — — - No FP,No S
<br /> 2/17/1998 -- NA NA NA NA NA — — — — No FP No S
<br /> 6124/1998 -- <200 39 <2 0 <2 0 <2 0 — - -- — No FP,No S
<br /> 9/21/1998 -- <2000 138 <2 0 <2 0 <2 0 — — — — No FP,No S
<br /> 12/14/1998 - <200 228 <2 0 <2 0 <2 0 -- - -- - No FP,No S
<br /> 12/14/1998 — <200 314 <2 0 <2 0 <2 0 — — — -- [D],No FP,No S
<br /> 3/31/1999 -- <200 392 <2 0 <2 0 <2 0 — — — — No FP No S
<br /> 6/11/1999 — <200 628 <2 0 <2 0 <2 0 — -- -- -- No FP No S
<br /> 9/10/1999 — <400 800 <4 0 <4 0 812 -- -- -- -- No FP, No S
<br /> 12/3/1999 — <400 984 <4 0 <4 0 892 — — — No FP, No S
<br /> 4/3/2000 — <200 281 <2 0 <2 0 246 - — — -- No FP,No S
<br /> 6/22/2000 -- <200 114 <2 0 <2 0 <2 0 — — -- No FP,No S
<br /> 9/27/2000 - 355 4,500 <2 0 <2 0 338 - -- -- - No FP,No S
<br /> 12/20/2000 - <200 1,870[1] <2 0 <2 0 175 -- - - — No FP,No S
<br /> 3/16/2001 — <200 2 190[1] <2 0 <2 0 246 -- -- - -- No FP, No S
<br /> 6/21/2001 - <14,000 28,000 <290* <290* <290* — _ — No FP,No S
<br /> 9/13/2001 — <2 500 4,500 <50 <50 <50 - -- -- -- No FP,No S
<br /> 12/11/2001 -- 1,100 8,800 <2 0 <2 0 72 — — — — No FP,No S
<br /> 3/14/2002 - <2,500* 4,700 <250* <250* <250* — — — — No FP, No S
<br /> 6/19/2002 - <5,000 17,000 <500 <500 <500 <500 — — - No FP,No S
<br /> 9/12/2002 <4 000 <500 3,100 <50 <50 <50 85 <50 — — No FP,No S
<br /> 12/3/2002 <2,000 3,100 <50 <50 <50 80 -- -- - No FP,No S
<br /> 03/11/2003 <10 000 <2,000 3,200 <50 <50 <50 <50 — — —
<br /> 06/09/2003 <25 000 <5 000 10,000 <250 <250 <250 <120 — — —
<br /> 09/17/2003 <10,000 <2,000 3,600 <100 <100 <100 <50 — —
<br /> 12/11/2003 <5,000 <1 000 3,200 J <50 <50 <50 <25 -- _03/10/2004 <25,000 <5,000 6,400 J <250 <250 <250 <120 -- -- -- `
<br /> MW-2 6/24/1998 — <200 33 <20 <2 0 <2 0 -- -- -- -- No FP,No S
<br /> 9/21/1998 <200 <2 0 <20 <2 0 <2 0 — — — — No FP,No S
<br /> 12/14/1998 <200 <2 0 <20 <2 0 <2 0 -- -- - — No FP,No S
<br /> 3/31/1999 — <200 <2 0 <2 0 <2 0 <2 0 — -- -- -- No FP,No S
<br /> 6/11/1999 — <200 222 <2 0 <2 0 <2 0 -- — — — No FP,No S
<br /> 9/10/1999 — <200 364 <2 0 <2 0 <2 0 — — No FP,No S
<br /> 12/3/1999 — <200 666 1 <2 0 <2 0 <2 0 — — -- -- No FP,No S
<br /> Report Date May 5,2004 Page 1 of 7
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