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Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No. 548 1612 W. Hammer Lane, Stockton, CA Well Date Ethanol TBA MtBE DIPE EtBE TAME 1,2-DCA Comments Number Sampled (pg1L) (pg1L) (pg/L) (pg/L) (991L) (pg/L) (,vg1L) VW-2 03!03/2003 <200 <40 <1.0 <1.0 0.0 <1.0 23 06/03/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 14 09/18/2003 <1,000 <200 <5.0 <10 <10 <i0 30-- 12/08/2003 012/08/2003 <1,000 <200 5.0 <10 <10 <10 40 03/11/2004 <1,000 240 <5.0 <10 <10 <10 42 06/11/2004 <100 <20 <0.50 <0.50 <0.50 <0.50 i0 0810312004 <100 41 2.4 <0.50 <0.50 <0.50 1 47 VW-3 12/13/2001 -- 59 16 <0.50 <0.50 <0.50 8.2 3/12/2002 - <5.0 0.72 <0.50 <0.50 <0.50 2.5 9!912002 - 6.3 1.6 <0.5 <0.5 <0.5 4.4 12!412002 -- <20 4.6 <0.5 <0.5 <0.5 21 03/03/2003 <100 39 3.6 <0.50 <0.5Q <0.50 4.3 06/03/2003 <100 22 2.7 <1.0 <1.0 <1.0 2.1 09/18/2003 <i,000 <200 <5.0 <10 E<20 <1❑ 9.6 1210812003 <2,000 <400 <10 <20 <20 <10 03I11/24Q4 <2,000 <400 <10 <20 <20 <i0 06/11/2004 <100 33 1.5 <0.50 <0.50 1.5 0810312004 <1,000 <200 6.5 <5.0 <5.0 29 VW-4 12/13/2001 -- <5.0 100 <0.50 <0.50 <0.50 12 3112!2002 - <5.0 32 <0.50 <0.50 <0.50 5.3 9!9!2002 -- <5 110 <0.5 <0.5 121412002 - <20 39 <0.5 <0.5 <0.5 2.8 03/03/2003 <100 <20 0.88 <0.50 <0.50 <0.50 <0.50 <100 <20 0.95 <0.50 <1.0 <1.0 <1.0 06103!2003 09/18/2003 <100 <20 50 <1,0 <1.0 <1.0 2.9 12/08/2003 <100 <20 6.4 <1.0 <1.0 <1.0 1.i 03/11/2004 <100 <20 <0.50 <1.0 <1.0 <1.0 <0.50 06/11/2004 <100 <20 1.1 <0.50 <0.50 <0.50 0.85 08/03/2004 <100 <20 55 <0.50 <0.50 <0.50 3.4 VW-50 12/13/2001 - <50[3] 67[3] <5.0[3] <5.0[3] <5.0[3] 83[3] 3/12/2002 - 890 <2.5[3] <2.5131 <2.5[3] <2.5[3] <2.5[3] 9/9/2002 -- 290 <5 <5 <5 <5 <5 1214/2002 -- <4,000 <100 <100 <100 <100 <100 Page 5 of 7 Report Date:August 13,2004