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I Table 2 Fuel Oxygenates Analytical Data M Former ARCO Service Station No 2168 441 W Charter Way, Stockton CA Well Date Ethanol TBA MtBE DIPE EtBE TAME 1,2-DCA EDB PCE Methanol Number Sampled (pg/L) {Pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) Comments MW-6 02/0912004 <10,000 <2,000 <50 <100 <100 <100 <50 -- — MW-7 11/17/1997 NA NA NA NA NA NA NA -- -- — {48) <10,000 <100 <100 <100 <100 NA -- — — (47) 5/22/1998 NA (47) 8/12/1998 NA <200 <2 <2 <2 <2 NA — — - 11!911998 NA <200 <2 <2 <2 <2 NA — — (47) 2/17/1999 NA <200 <2 <2 g<2 9,9 JNA -- — — (47) 5/25/1999 NA <200 <2 <2 — -- - {35) 811 811 99 9 NA <200 <2 <2 — — (47) 1 211 711 9 9 9 NA <200 <2 <2 — -- -- (47),t2] 2/22/2000 NA <200 <2 <2 <2 — — — {47) 6/22/2000 NA <200 <2 4 88 <2 <2 NA — -' — (41) 8/30/2000 NA <200 <2 <2 <2 <2 <2 — -- 11/21/2000 NA <200 <2 <2 <2 <2 <2 -- - — 2/15/2001 NA <200 <2 <2 <2 <2 <2 - 5/17/2001 NA <1,000[2] <10[2] ---Z1-0[2] <10[2] <10121 <10[2] — - — 8/16/2001 NA <200 <2 <2 <2 <2 <2 -- 12/6/2001 NA <50[2] <5 0(2) <5 0[2] <5 Ot2] <5 0[2] <5 0[2] —2114/2002 NA <5 0 <0 50 1 - 8/22/2002 NA <5 <0 50 11/1312002 NA 0 211 212 0 0 3 <400 - 05/29/2003 <200 08/04/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 -- — — 11/03/2003 <500 UJ <100 UJ <2 5 UJ <5 0 UJ <5 0 UJ <5 0 UJ <2 5 UJ -- - — 0210912004 <500 <100 <2 5 <50 <5 0 <5 0 <2 5 -- -- MW-8 8/30/2000 NA <200 <2 <2 <2 <2 338 — — 11/21/2000 NA <200 <2 <2 <2 <2 218 — — 2/15/2001 NA <200 <2 <2 <2 <2 346 — - — 5/17/2001 NA <200 <2 <2 <2 <2 264 — — 8116I2001 NA <200 <2 <2 <2 <2 3 2 — -- — 12/6/2001 NA <5 0 <0 50 <0 50 <0 50 <0 50 36 -- — — 2/14/2002 NA <5 0 <0 50 <0 50 <0 50 <0 8/2212002 NA 6 5 <0 50 <0 50 <0 50 11/13/2002 NA <20 <0 50 <0 50 <0 50 <0 50 2 7 — — r 1 Page 6 of 8 Report Date Apn!21,2004