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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# J162-07 Date 6/18/98 <br /> Lab ID Dates Analyzed 6/16-6/17/98 <br /> Thorpe Oil Method 8260 <br /> 351 N Beckman <br /> Lodi CA 95240 <br /> Samples Analyzed. J20814 through J20831 <br /> Sample Spiked J20833 <br /> • <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> % Recovery Duplicate % Percent <br /> Recovery Difference (%) <br /> Methyl Cert-Butyl Ether 91 7 914 031 ND <br /> Diisopropyl Ether 1054 1069 14 ND <br /> Ethyl tert-Butyl Ether 998 994 0 35 ND <br /> tert-Amyl Methyl Ether 968 970 0 14 ND <br /> i <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />