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CAMBRIA Table 1 Additional Groundwater Analytical Data,Shell-branded Service Station,2494 East Fremont Street,Stockton,Califoruma I Sample Date MTBE DIPE ETBE TAME TBA 1,2-DCA EDB Ethanol Methanol (Ng1l) WA) (og/l) (Ag/1) (AgA) (ug l) (ug1l) (lrgA) (KgIl) S-1 22-Nov-99 <200 <200 <200 <200 <20,000 NA NA <100,000 NA S-1 28-Nov-01 <50 <50 <50 <50 <500 NA NA <500 NA S-1 28-Oct-02 <100 <100 <100 <100 4,000 540 350 <1,000 <10,000 S-2 11-May-98 <2 0 <2 0 <2 0 <2 0 <100 NA NA <500 <1,000 S-2 28-Oct 02 <0 50 <2 0 <2 0 <2 0 <50 28 <2 0 <500 4,000 S-3 l I-May-98 <2 0 <2 0 <2 0 <2 0 <100 NA NA <500 <1,000 S-3 28-Oct-02 <0 50 24 <2 0 <2 0 <50 39 <2 0 <500 <1,000 S4 18-Feb-00 <0 50 127 <1 00 <1 00 <20 0 123 <0 500 <100 <1,000 S-4 03-May-00 <2 00 773 <2 00 <2 00 <100 806 <2 00 <1,000 NA S4 02-Aug-00 133* 7 16* <1 00* <100* <20 0* 7 50* <1 00* NA NA S4 20-Nov-00 15 90 <0 50 <0 50 <5 0 10 <0 50 NA NA S-4 05-Feb-01 <2 00 852 <2 00 <2 00 <200 <2 00 <2 00 NA NA S-4 14-May 01 <0 50 920 <0 50 <0 50 <5 0 90 <0 50 NA NA S-4 30 Aug-01 <0 50 70 <2 0 <2 0 <50 12 <2 0 NA NA S-4 28-Nov-01 <0 50 73 <2 0 <2 0 <50 10 <2 0 <500 NA S-4 18-Feb-02 <0 50 53 <2 0 <2 0 <50 83 <2 0 NA NA S-4 01-May-02 <0 50 69 <2 0 <2 0 <50 140 <2 0 NA NA S-4 08-Aug 02 49 63 <2 0 <2 0 <50 13 <2 0 NA NA S-4 28-Oct-02 057 60 <2 0 <2 0 <50 13 <2 0 <500 <1,000 Abbreviations and Notes NA=Not analyzed <x=Not detected at reporting ltmtt of z µg11=Micrograms per liter(parts per billion) *=Sample analyzed outside of EPA recommended hold trine Ethanol,Tertiary butanol(TBA), di-isopropyl ether(D1PE) methyl tertiary butyl ether(MTBE) 1,2-11hromoethane(EDB),1,2-Dichloroethane(1,2-DCA), ethyl tertiary butyl ether(ETBE),and tertiary amyl methyl ether(TAME)by EPA Method 8260B Methanol by EPA Method 8015(Modified) h I 0797 Page 1 of 1