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0 0age 5 of 5 Table 2 Fuel Oxygenates Analytical Data ARCO Service Station#4932 16 E Harding Way Stockton CA tWell- " u Date TBA _ MtBE DIPE ELBE TAME 12 DCA EDB Ethanol ,kr Number Sampled_ (ppb) (pQb) (Epb) (Ppb) (ppb) (ppb) (ppb) (ppb) EW 1 04/11/02 <25 000 520,000 <2 500 <2 500 <2 500 <2 500 <2 500 07/12102 2 800 460 000 150 <100 260 11120/02 Not sampled LPH sheen present 01/30103 <100,000 200,000 <2 500 <2 500 <2,500 <2 500 <2 500 <200 000 04/28/03 Well unable to be sampled connected to remedial system 07/29/03 QO 000 97 000 <500 <500 <500 <600 <500 <100 000 10/09/03 <10,000 25,000 <250 <250 <250 <260 <250 <50 000 EW 2 07/12/02 <10 000 65 000 <1 000 <1 000 <1 000 - 11120/02 3 600 90 000, <50 <50 120 <50 <50 01/30/03 <4,000 61,000 <100 <100 <100 <100 <100 <8 000 04/28/03 40000 55 000 <500 <500 <500 <500 <500 <100 000 07/29/03 <20,000 .50000 <500 <500 <500 <500 <500 <100 000 10/09/03 <20,000 23,000 <500 <500 <500 <500 <500 <100 000 EW 6 11/20/02 <200 280 <5 0 <5 0 <5 0 13 <5 0 01/30/03 <4 000 600 <100 <100 <100 <100 <100 <8 000 04/28/03 Well unable to be sampled connected to remedial system 07/29/03 <400 1 000 <10 <10 <10 <10 <10 <2 000 10/09!03 Insufficient amount of water In well for sample collection QCTB 07/28/03 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <100 10/09103 - - - - - -- - - Notes EtBE=Ethyl tertiary butyl ether EDB=Ethylene dibromide TBA=Tertiary butyl alcohol TAME=Tertiary amyl methyl ether ppb=parts per billion MtBE=Methyl tertiary butyl ether 1 2 DCA=1 2 Dichloroethane LPH=Ipuid phase hydrocarbons DIPE=Di esopropyl ether <a less than given Laboratory detection limit =not analyzed '=The concentration indicated for this analyte is an estimated value above the calibration range of the instrument 2=Results were reported with a possible high bias due to the continuing calibration verification falling outside acceptance criteria ProlecVARCO/4932/Report gables/4003 gwtables4932 xis