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0 0 CAIA Table 1 Additional Groundwater Analytical Data,Shell-branded Service Station, 1071 North Main Street,Manteca,California Sample Date Ethanol TBA DIPE EDB 1,2-DCA ETBE TAME Methanol MTBE 8020 MTBE 8260 ID Sampled (Ag/1) (Ag/1) (jg1l) 41g1l) OLgll) (µgll) (µg11) (µg/l) (Agll) (Ag/l) I MW-2 26-Apr-Ol <500 <200 <5 00 <5 00 <5 00 <5 00 <5 00 NA NA <5 00 MW-3 28-Apr-98 <500 <100 <2 0 NA NA <2 0 <2 0 <1,000 63 69 MW-3 28-Jul-98 <500 <100 <2 0 <0 50 <0 50 <2 0 <2 0 <1,000 44 45 MW-3 07 Oct-98 <500 <100 <2 0 <0 50 <0 50 <2 0 <2 0 <1,000 11 97 MW-3 28-Jan-99 <500 <t00 <2 0 <0 50 <0 50 <2 0 <2 0 <2,000 <2 5 <2 0 MW-3 08 Apr-99 <100 <20 0 <t 00 <0 500 <0 500 <1 00 <1 00 <1,000 <5 00 230 MW-3 22-Jul-99 <500 <100 <2 00 <0 500 <0 500 <2 00 <2 00 <I,000 449 343 MW-3 13-Oct-99 <500 <100 <2 00 <0 500 <0 500 <2 00 <2 00 <1,000 <2 50 <2 00 MW-3 06-Jan-00 <1,000 <200 <2 00 <0 500 <0 500 <2 00 <2 00 <1,000 <2 50 <2 00 MW-3 11-Apr-00 <200 <200 <100 <100 <100 <100 <100 <1,000 468 176 MW-3 27-Jul-00 <400 <200 <100 <100 <0 500 <1 00 <1 00 <1,000 <2 50 <t 00 MW-3 t0 Oct-00 <2,000 <400 <20 0 <100 <t0 0 <20 0 <20 0 <1,ODO 472 350 MW-3 23-Jan-01 <0 60 230 <0 60 NA <0 60 <0 60 068 <60 NA 340 MW-3 26-Apr-Ol <500 <200 <5 00 <5 00 <5 00 <5 00 <5 00 NA NA <5 00 I Abbreviations and Notes NA=Not analyzed or not available <x=Not detected at method detection limit of x µg11=Micrograms per liter(parts per billion) 12-DCA=1 2 dichloroethane by EPA Method 8010 or equivalent EDB=Ethylene dibrortude(1,2-dibromoethane)by EPA Method 8010 or equivalent I MTBE=Methyl tert-butyl ether by EPA Methods 8020 and 8260 as indicated TBA=Tert-butyl alcohol(t butnaol)by EPA Method 8260 RIPE=Di isopropyl ether by EPA Method 8260 ETBE= Ethyl tert-butyl ether by EPA Method 8260 TAME=Tert-amyl methyl ether by EPA Method 8260 dup=Duplicate sample 0323 Page 2 of 3