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Geo alytical Laboratories, Onc. <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 />Mario D'Onofrio <br />Chemist <br />Certification # 1157 <br />&UAA-6, �� <br />Donna Keller <br />Laboratory Director <br />Date Sampled: <br />5/02/03 <br />Sampler: R. Azevedo (Geo) <br />Sample ID <br />Lab ID RL Method <br />Analyte <br />Results <br />Units <br />Dispenser #12 @ 4' <br />P200652 10 8260B <br />Methyl tert-butyl ether (MTBE) <br />ND <br />gg/Kg <br />400 <br />Ethanol <br />ND <br />200 <br />tert-Butanol <br />ND <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 21.4 <br />107.0 <br />66-133 <br />2-Bromo-l-chloropropane 20 22.5 <br />112.5 <br />63-139 <br />4-Bromofluorobenzene <br />20 17.2 <br />86.0 <br />64-136 <br />Dispenser #1 @ 4' <br />P200653 10 8260B <br />Methyl tert-butyl ether (MTBE) <br />211 <br />gg/Kg <br />400 <br />Ethanol <br />ND <br />200 <br />tert-Butanol <br />1610 <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 20.1 <br />100.5 <br />66-133 <br />2-Bromo-l-chloropropane 20 38.3* <br />191.5 <br />63-139 <br />4-Bromofluorobenzene <br />20 18.6 <br />93.0 <br />64-136 <br />*Matrix Interference <br />Dispenser #5 @ 3' <br />P200654 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 22.1 <br />110.5 <br />66-133 <br />2-Bromo-l-chloropropane 20 25.4 <br />127.0 <br />63-139 <br />4-Bromofluorobenzene <br />20 18.3 <br />91.5 <br />64-136 <br />Mario D'Onofrio <br />Chemist <br />Certification # 1157 <br />&UAA-6, �� <br />Donna Keller <br />Laboratory Director <br />