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' Table 2 Groundwater Sample Analytical Results for Fuel Oxygenates and Additives Former E-Z Serve Location No 100966 2537 Waterloo Road,Stockton,California Well Sampling 1,2-DCA EDB TAME TBA DIPE ETRE MTBE ETH ME'T'H No Date (pg/L) �n/L)_. (µg/L) (µg/1-) (m /I,) (µg/1,) OWL) (n/L) (ug/l-) VW-1 11/6/2001 <20 <250 <20 <20 250 <1,000 <1,000 1/29/2002 81 <1 <1 15 <1 <1 54 <100 <100 5/31/2002 39 <1 0 <1 0 110 <1 0 <1 0 200 <250 <250 8/20/2002 <10 <10 <1 0 73 <10 77 280 <1,000 <1,000 11/20/2002 <100 <100 <100 4,000 <100 <100 430 <10,000 <500 1/16/2003 <100 <100 <100 <I,000 <100 <100 250 -- -- 4/16/03 <L 0 4 0 <2 0 <20 <2 0 <2 0 <2 0 -- -- VW-2 11/6/2001 -- -- <2 0 140 <2 0 <2 0 100 <1,000 <1,000 1/29/2002 15 <1 <1 90 <1 <1 75 <100 <100 ' 5/31/2002 11 <10 <10 160 <10 <10 100 <250 <2.50 8/20/2002 82 <1 0 <1 0 100 <1 0 76 94 <1,000 <1,000 11/20/2002 16 <0 5 <0 5 160 <0 5 <0 5 160 <50 <500 1/16/2003 16 <0 5 <0 5 140 <0 5 <0 5 130 -- -- 4116/03 <10 <10 <10 <100 <10 <10 210 -- -- VW-3 11/6/2001 -- -- <2 0 <25 <2 0 <2 0 19 <1,000 <1,000 1/29/2002 92 <1 <1 <5 <1 <1 34 <100 <100 t 5/31/2002 77 <1 0 <1 0 64 <10 <1 0 37 <250 <250 8/20/2002 5 6 <1 0 <1 0 64 <1 0 <1 0 37 <1,000 <1,000 11/20/2002 66 <0 5 <0 5 <5 0 <0 5 <0 5 36 <50 <500 ' 1/16/2003 85 <05 <05 <50 <05 <05 48 4/16103 40 <20 <20 120 <20 <20 180 Notes Latest analytical results above their respective laboratory detection limits are in boldface font See Table 1 for historic MMTBE results All laboratory results performed by EPA Method 8260 unless noted below DIPE =Di-isopropyl Ether ETBE =Ethyl tert-Butyl Ether MTBE =Methyl-tert-Butyl Ether TAME =tert-Amyl Methyl Ether TBA =tert-Butanol 1,2-DCA =1,2-Dichloroethane EDB =Ethylene Dibromide(1,2-Dibromoethane) ETH =Ethanol(EPA Method 8015) METH =Methanol (EPA Method 8015) µg/L =micrograms per liter(--parts per billion) < =Below the indicated laboratory detection limit t S 1E-ZSarve11009661Repons1EZ966GWR002 Page 3 of