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GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br /> Report# P183-19 QC REPORT <br /> Foothill Engineering Dates Analyzed 07/08/03 <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 V00283 8260B 103.0 78.3 90.8 14.8 ND <br /> Di-isopropyl Ether(DIPS) 110.0 102.0 101.0 1.0 ND <br /> Benzene <br /> 109.0 108.0 96.8 10.9 ND <br /> 1,2-Dichloroethane(1,2-DCA) 113.0 82.9 84.6 2.0 ND <br /> tertiary-Amyl Methyl Ether 112.0 91.3 93.9 2.8 ND <br /> Toluene <br /> 104.0 118.0 101.0 15.5 ND <br /> • <br /> Comments: <br /> • <br /> PCjr, ko�pid <br /> Mario D'Onofrio Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />