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i a u <br /> GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br /> *Report# Q170-01 QC REPORT <br /> Foothill Engineering Dates Analyzed 06/22/04 <br /> 12793 Paddy Creek Lane <br /> Lodi CA 95240 <br /> LCS MS% MSD % RPD Blank <br /> Analyte Batch # Method %Recovery Recovery Recovery <br /> Methyl tertiary-Butyl Ether V00233 8260B 99.7 116.0 109.0 6.2 ND <br /> Di-isopropyl Ether(DIPE) 88.3 99.4 99.3 0.1 ND <br /> Benzene 93.0 97.5 98.0 0.5 ND <br /> tertiary-Amyl Methyl Ether 93.4 99.3 93.3 6.2 ND <br /> Toluene <br /> 93.1 93.6 86.5 7.9 ND <br /> Comments: <br /> Mario D'Onofrio Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />