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GeoAnal tical Laboratoi.es Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone (209)572-0900 Fax (209)572-0916 } <br /> CERTIFICATE OF ANALYSIS L <br /> Report# P122-12 Oxygenates ;' Date: 5/09/03 <br /> Thorpe Oil Project: Thorpe's Yard Ig Date Recd: 5/02/03 <br /> Date Started: 5/06/03 <br /> PO Box 357 Date Completed:5/06/03 <br /> Lodi CA 95241 PO# <br /> j Date Sampled: 5/02/03 <br /> i <br /> R.Sampler: Il Azevedo(Geo) <br /> 'v <br /> Sample ID Lab ID RL Method Analyte j{' Results Units <br /> Dispenser#9 @ 4' P200649 10 8260B Methyl tert-butyl ether(MTBE) NSD µi1/Kg <br /> 400 Ethanol <br /> 200 tert-Butanol i ND <br /> 10 di-Isopropyl ether(DIPE) ND <br /> 10 Ethyl tert-butyl ether(ETRE) ND <br /> 10 tert-Amyl methyl ether(TAME) ND <br /> Surrogate Amnt Spiked Amnt Rec. %Recovery QC Limit% <br /> 1,2-Dich[oroethane-d4 20 22.7 113.5 66-133 <br /> 2-Bromo-l-chloropropanei 20 25.9 129.5 63-139 <br /> 4-BromoEluorobenzene I,� <br /> 24 I <br /> 18.8 94.0 64-136 <br /> Dispenser#10 @ 4' P200650 10 8260B Methyl tert-butyl either(MTBE) ND µg/Kg <br /> 400 Ethanol i; ND j <br /> 200 tert-Butanol l ND 1 <br /> 10 di-Isopropyl ether(DIPE) ND <br /> 10 Ethyl tent-butyl ether(ETBE) ND <br /> 10 tert-Amyl methyl ether(TAME) ND <br /> Surrogate Amnt Spiked, Amnt Rec. %Recovery QC Limit <br /> 1,2-Dichloroethane-l4 ly 20 25.3 126.5 66-133 <br /> 2-Bromo-l-chloropropane '- 20 36.9* 164.5 63-139 <br /> 4-Bromofluorobenzene 20 19.2 96.0 64-136 <br /> *Matrix Interferencei <br /> I� I <br /> ND /K <br /> Dispenser#11 @ 4' P200651 10 8260B Methyl tert-butyl ether(MTBE) µg g <br /> 400 Ethanol ND <br /> 200 tert-Butanol ND <br /> 10 di-Isopropyl etherl(DIPE) ND <br /> 10 Ethyl tert-butyl ether(ETBE) ND <br /> 10 tent-Amyl methyl ether(TAME) ND <br /> Surrogate Arr t Spiked A=t Rec. %Recovery QC Limit% <br /> I <br /> 1,2-Dichioroethane{4 �� 20 18.4 92.0 66-133 ] <br /> 2-Bromo-l-chloropropane 20 21.4 107.0 63-139 <br /> 4-Bromofluorobenzene 20 18.8 94.0 64-136 <br /> Mario D'Onofrio Donna Keller <br /> Chemist Certification # 1157; Laboratory Director 1 <br />