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GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Phone (209) 572-0900 <br /> Modesto, CA 95351 FAX (209) 572-0916 <br /> QC REPORT <br /> Report# I303-07 Date: 11/04/97 <br /> Lab ID Dates Analyzed: 11/3-4/97 <br /> Semco Method: 8260 <br /> 1217 S 7th Street <br /> Modesto CA 95351 <br /> Samples Analyzed: I21365-74 <br /> Sample Spiked: 121465 <br /> Analyte Matrix Spike Matrix Spike RPD Blank <br /> %Recovery Duplicate% <br /> Recovery <br /> Methyl tertiary-Butyl Ether 104 121 15.1 ND <br /> Di-isopropyl Ether 108 116 7.1 ND <br /> Ethyl tertiary-Butyl Ether 106 117 10.5 ND <br /> Richard Meissner Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />