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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# J142-04 Date: 5/29/98 <br /> Lab ID Dates Analyzed: 5/28/98 <br /> Thorpe Oil Method: 8260 <br /> 351 N Beckman <br /> Lodi CA 95240 <br /> Samples Analyzed: J20686,J20687 <br /> Sample Spiked: Method Spike <br /> Analyte Method Spike Method Spike Relative Blank <br /> %Recovery Duplicate % Percent <br /> Recovery Difference (%) <br /> Methyl tert-Butyl Ether 102.2 101.9 0.29 ND <br /> Diisopropyl Ether 108.5 109.2 0.64 ND <br /> Ethyl tert-Butyl Ether 109.6 108.9 0.64 ND <br /> tert-Amyl Methyl Ether 105.3 103.4 1.8 ND <br /> Sylvia Krenn o a K � <br /> Chemist Certification # 1157 Laboratory Director <br />