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GeoPhalytical Laboratories, c. <br />1405 Kansas Avenue Modesto, CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br />Report# P122-12 QC REPORT <br />Thorpe Oil Dates Analyzed 05/06/03 <br />PO Box 357 <br />Lodi CA 95241 <br />Comments: <br />Mario D'Onofrio, <br />Donna Keller <br />Chemist Certification # 1157 Laboratory Director 1 <br />LCS <br />MS % <br />MSD % <br />RPD <br />Blank <br />Analyte Batch # Method <br />%Recovery <br />Recovery <br />Recovery <br />Methyl tertiary -Butyl Ether V00205 8260B <br />88.5 <br />105.5 <br />100.5 <br />4.9 <br />ND <br />Di -isopropyl ether (RIPE) <br />119.5 <br />127.8 <br />119.3 <br />6.9 <br />ND <br />Ethyl tertiary -Butyl Ether <br />102.5 <br />105.0 <br />105.5 <br />0.5 <br />ND <br />tertiary -Amyl Methyl Ether <br />97.3 <br />111.0 <br />103.3 <br />7.2 <br />ND <br />Comments: <br />Mario D'Onofrio, <br />Donna Keller <br />Chemist Certification # 1157 Laboratory Director 1 <br />