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Geonai tical Laboratories Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone (209)572-0900 Fax (209) 572-0916 <br /> Report# K155-07 QC REPORT <br /> Thorpe Oil Dates Analyzed 6/7/99 <br /> PO Aox 357 i <br /> Lodi CA 95241-0357 <br /> %Recovery Duplicate RPD Blank <br /> %Recovery <br /> Analyte Batch # Method <br /> Methyl tertiary-Butyl Ether V00259 8260 102.0 101.9 0.0 ND <br /> Di-isopropyl ether (DIPE) 98.4 98.4 0.1 ND <br /> t' Ethyl tertiary;-Butyl Ether (ETBE) 99.4 99.9 0.5 ND <br /> tertiary-Amyl. Methyl Ether 101.8 100.1 1.7 ND . <br /> r <br /> E <br /> k <br /> k <br /> 4 <br /> Comments: <br /> � -- X, <br /> S vja Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />