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Table 2 Fuel Oxygenates Analytical Data - Former ARCO Service Station No 2168 441 W Charter Way, Stockton CA Well Date Ethanol TBA MtBE DIPS EtBE TAME 7TIT PCE Methanol Number Sampled (pg/L) Wg1L) (pg/L) (pg1L) (pg/L) (pglL) (pglL) (pg/L) Comments MW-5 5/17/2001 NA <200 <2 <2 <2 <2 8/16/2001 NA <200 <2 <2 <2 <2 — -- I 12/6/2001 NA <50[2] <5 0[2] <5 0[2] <5 0[2] <5 0[2] <5 0[2] - — — 2/14/2002 NA <50 <0 50 <0 50 <0 50 <0 50 <0 50 — - - 8122/2002 NA <100 <10 <10 <10 <10 <10 — ~ — 11/13/2002 — <20 <0 50 <0 50 <0 50 <0 50 <0 50 -- — ~ 0 211 212 003 <40 <20 <0 50 <0 50 <0 50 <0 50 <0 50 — - - 05/2912003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 -- — 08/0412003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 — -- - 11/03/2003 <1 000 <200 <5 0 <10 00 <10 <5 0 — - -- 0210912004 <100 <20 <0 50 <1 0 <1 0 <1 0 <4 50 — — — MW-6 11/17/1997 NA <3,300 <67 <67 <67 <67 NA -- — -- 512 211 9 9 8 NA <10 000 <100 <100 <100 <100 NA - — 8/12/1998 NA <20 000 <200 <200 <200 <200 NA - — - i 1/9/1998 NA <200 <2 <2 <2 <2 NA — --2/17/1999 NA <200 <2 882 <2 <2 NA — — ~ 5/25/1999 NA <200 <2 <2 <2 <2 NA -- ~ -- 8M811999 NA <200 478 <2 <2 <2 NA -- -12J17/1999 NA <200 <2 <2 <2 <2 NA -- -- - i2212000 NA <200 <2 <2 <2 <2 NA — — ~ fi/22/2000 NA <200 <2 <2 <2 <2 - 8/30/2000 NA <200 <2 432 <2 <2 252 --11/2112000 -11/21/2000 NA <200 <2 476 <2 <2 242 — -- — 2/15/2001 NA <200 <2 <2 <2 <2 123 -- — -- 5/17/2001 NA <4,000[2] <40[2] <40[2] <40[2] <40[2] <40[2] — -- — 8/16/2001 NA <5,000[2] <50[2] <50[2] <50[2] <50[2] <50[2] — — -- 12/6/2001 NA <1,000[2] <100[2] <100[2] <100[2] <100[2] <100[2] — -- — 2/14/2002 NA <500[2] <50[2) <50[2] <50[2] <50[2] <50[2] — — ~ 8/22/2002 NA <250 <25 <25 <25 <25 <25 -- — 11/13/2002 NA <4,000 <100 <100 <100 <100 150 — -- — 02/12/2003 <4,000 <2,000 <50 <50 <50 <50 <50 05129/2003 <25, 000 <5,000 <120 <250 <250 <250 <120 — -- -- 08/04/2003 <10,000 <2,000 <50 <100 <100 <100 <50 11/03/2003 <500 R <100 R <2 5 R <5 0 R <50R <5 O R <2 5 R — I Report Date Apn!21, 2004 Page 5 of 8