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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# J202-15 Date: 08/10/98 <br /> Lab ID Dates Analyzed: 08/01/98 <br /> Thorpe Oil Method: 8260 <br /> 351 N Beckman <br /> Lodi CA 95240 <br /> Samples Analyzed: J21115,J21116 <br /> Sample Spiked: J21118 <br /> Analyte Matrix Spike Matrix Spike RPD Blank <br /> % Duplicate % <br /> Methyl tert-Butyl Ether 105.2 97.0 8.1 ND <br /> Diisopropyl Ether 105.9 106.2 0.2 ND <br /> Ethyl tert-Butyl Ether 109.0 107.1 1.8 ND <br /> tert-Amyl Methyl Ether 106.3 101.4 4.7 ND <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />