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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# K036-05 Date: 2/11/99 <br /> Dates Analyzed: 2/10-2/11/99 <br /> Cal-Inc Method: 8260 <br /> 2040 Peabody Rd.Suite 400 <br /> Vacaville, CA K20428 <br /> Samples Analyzed: K20428, K20429, K20430, K20431, K20432, K20433, K20434, K20435, K20436, K20437, <br /> K20438,K20441+K20443 composite <br /> Sample Spiked: Method Spike <br /> Analyte Method Spike Method Spike Relative Blank <br /> %Recovery Duplicate % Percent <br /> Recovery Difference M <br /> Methyl tert-Butyl Ether 96.4 96.1 0.3 ND <br /> Diisopropyl Ether 103.4 103.2 0.2 ND <br /> Ethyl tert-Butyl Ether 102.0 101.4 0.5 ND <br /> tert-Amyl Methyl Ether 99.1 99.9 0.8 ND <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />