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GeoYnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone (209)572-0900 Fax (209) 572-0916 <br /> Report# K074-16 QC REPORT QC Batch# V00130 <br /> Semco(Modesto) <br /> 1217 S 7th Street <br /> Modesto CA 95351 <br /> Dates Analyzed 3/19/99-3/20/99 <br /> MS% MSD% RPD Blank <br /> Analyte Method Recovery Recovery <br /> Methyl tertiary-Butyl Ether (MTBE) 8260 89.2 86.2 3.4 ND <br /> Di-isopropyl ether (DIPE) 97.9 95.8 2.2 ND <br /> Ethyl tertiary-Butyl Ether (ETBE) 94.2 93.0 1.3 ND <br /> tertiary-Amyl Methyl Ether (TAME) 93.6 95.8 2.3 ND <br /> Comments: <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />