ARCHIVED REPORTS_XR0005702 CASE 1

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• • • Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No 6020 1711 E Yosemite Avenue, Manteca, CA Well Date Ethanol TSA MtBE DIPE EtBE TAME 1,2-DCA EDS Methanol Number Sampled (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pglL) (pg/L) (pg/L) (pgtL) Comments MW-5 2/15/2001 — <200 <2 <2 <2 <2 <2 <2 — 6/1/2001 -- <200 <2 <2 <2 <2 <2 <2 -- 9/11/2001 — <200 <2 <2 <2 <2 <2 <2 — 12/20/2001 -- <20 <2 <2 <2 <2 <2 <2 — 3/20/2002 -- <5 <0 5 <05 <05 <0 5 <0 5 <05 -- 6/20/2002 -- <5 <0 5 <0 5 <05 <0 5 <0 5 <0 5 - 9/24/2002 <20 <0 5 <05 <0 5 <0 5 <05 <0 5 — 11/27/2002 -- 25 <0 5 <0 5 <0 5 <0 5 <05 <0 5 -- 02/17/2003 <40 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 -- 04/28/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 -- 07/28/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 -- 11/26/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 — <100 02/16/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 <100 05/26/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <100 08/05/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <100 11/12/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 <100 02/11/2005 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 <100 05/31/2005 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 -- 08/18/2005 1 <100 1 <20 1 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 -- MW-6 2/15/2001 -- <200 1,760 <2 <2 479 <2 <2 — 6/1/2001 -- <200 2,900 <2 <2 71 <2 <2 — 9/11/2001 — <10,000 2,900 <100 <100 <100 <100 <100 12/20/2001 — <20 2,400 <2 <2 48 <2 <2 -- 3/20/2002 — <5 270 <0 5 <0 5 <0 5 <0 5 <0 5 -- 6/20/2002 — <50 260 <5 <5 <5 <5 <5 — 9/24/2002 <200 770 <5 <5 <5 <5 <5 11/27/2002 <2,000 2,200 <50 <50 <50 <50 <50 -- 02/17/2003 <4 000 <2,000 340 <50 <50 <50 <50 <50 — 04/28/2003 <2,000 <400 230 <20 <20 <20 <10 <10 - 07/28/2003 <500 <100 200 <5 0 <5 0 <5 0 <2 5 <2 5 — 11/26/2003 <100 <20 170 <1 0 <1 0 <1 0 <0 50 -- <100 02/16/2004 <500 <100 59 <5 0 <5 0 <5 0 <2 5 <2 5 <100 05/26/2004 <200 <40 74 <10 <10 <10 <10 <10 <100 Report Date October 26, 2005 � __...... � � �� — � .-�_-_ Page 1 of 6