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GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone (209)572-0900 Fax (209) 572-0916 j <br /> *Report# K286-04 QC REPORT <br /> Foothill Engineering Dates Analyzed 10/15/99 <br /> 12793 Paddy Creek Lane <br /> Lodi CA 95240 <br /> MS% MSD% RPD Blank <br /> Recovery Recovery <br /> Analyte Batch # Method <br /> Methyl tertiary-Butyl Ether V00497 8260 83.9 75.2 11.0 ND <br /> Di-isopropyl ether (DIPE) 82.7 80.3 3.0 ND . <br /> Ethyl tertiary-Butyl Ether (ETBE) 88.5 92.6 4.5 ND <br /> tertiary-Amyl. Methyl Ether 91.8 89.6 2.5 ND <br /> Comments: <br /> • <br /> 7 ylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />