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Geo nalytical a oratories, c. <br />1405 Kansas Avenue Modesto, CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br />CERTIFICATE OF ANALYSIS <br />Report# P122-12 Oxygenates Date: 5/09/03 <br />Thorpe Oil Project: Thorpe's Yard <br />PO Box 357 <br />Lodi CA 95241 PO# <br />Date Recd: 5/02/03 <br />Date Started: 5/06/03 <br />Date Completed:5/06/03 <br />Date Sampled: 5/02/03 <br />Sampler: R. Azevedo (Geo) <br />Sample ID Lab ID RL Method Analyte Results Units <br />Dispenser #6 ® 3' P200655 10 8260B <br />Methyl tert-butyl ether (MTBE) <br />17 <br />ug/Kg <br />400 <br />Ethanol <br />ND <br />200 <br />tert-Butanol <br />222 <br />10 <br />di -Isopropyl ether (DIPS) <br />ND <br />10 <br />Ethyl tert-butyl ether (ETBE) <br />ND <br />10 <br />tert-Amyl methyl ether (TAME) <br />ND <br />Surrogate <br />Amnt Spiked Amnt Rec. <br />% Recovery <br />QC Limit % <br />1,2-Dichloroethane-d4 <br />20 21.5 <br />107.5 <br />66-133 <br />2-Bromo-l-chloropropane 20 24.4 <br />122.0 <br />63-139 <br />4-Bromofluorobenzene <br />20 18.0 <br />90.0 <br />64-136 <br />Dispenser #7 ® 4' P200656 10 8260B <br />Methyl tert-butyl ether (MTBE) <br />ND <br />ttg/Kg <br />400 <br />Ethanol <br />ND <br />200 <br />tert-Butanol <br />ND <br />10 <br />di -Isopropyl ether (DIPE) <br />ND <br />10 <br />Ethyl tert-butyl ether (ETBE) <br />ND <br />10 <br />tert-Amyl methyl ether (TAME) <br />ND <br />Surrogate <br />Amnt Spiked Amnt Rec. <br />% Recovery <br />QC Limit % <br />1,2-Dichloroethane-d4 <br />20 21.5 <br />107.5 <br />66-133 <br />2-Bromo-l-chloropropane 20 23.7 <br />118.5 <br />63-139 <br />4-Bromofluorobenzene <br />20 18.7 <br />93.5 <br />64-136 <br />Line Sample #4 ® 4' P200657 10 8260B <br />Methyl tert-butyl ether (MTBE) <br />ND <br />µg/Kg <br />400 <br />Ethanol <br />ND <br />200 <br />tert-Butanol <br />ND <br />10 <br />di -Isopropyl ether (DIPE) <br />ND <br />10 <br />Ethyl tert-butyl ether (ETBE) <br />ND <br />10 <br />tert-Amyl methyl ether (TAME) <br />ND <br />Surrogate <br />Amnt Spiked Amnt Rec. <br />% Recovery <br />QC Limit % <br />1,2-Dichloroethane-d4 <br />20 21.7 <br />108.5 <br />66-133 <br />2-Bromo-l-chloropropane 20 27.4 <br />137.0 <br />63-139 <br />4-Bromofluorobenzene <br />20 17.0 <br />85.0 <br />64-136 <br />Mario D'Onofrio - Donna Keller �j <br />Chemist Certification # 1157 Laboratory Directof <br />