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4 <br /> GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br /> Qeport# K195-06 QC REPORT <br /> Foothill Engineering Dates Analyzed 7/20/99-7/21/99 <br /> 12793 Paddy Creek Lane <br /> Lodi CA 95240 <br /> %Recovery Duplicate RPD Blank <br /> Analyte Batch # Method Recovery <br /> Methyl tertiary-Butyl Ether V00334 8260 90.9 86.2 5.2 ND <br /> Di-isopropyl ether (DIPE) 121.9 118.7 2.7 ND <br /> Ethyl tertiary-Butyl Ether (ETBE) 112.2 104.2 7.4 ND <br /> tertiary-Amyl Methyl Ether 109.9 99.2 10.3 ND <br /> Comments: <br /> 5 vi <br /> y a Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />