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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# J197-02 Date: 07/21/98 <br /> Lab ID Dates Analyzed: 7/17-7/20/98 <br /> Thorpe Oil Method: 8260 <br /> 351 N Beckman <br /> Lodi CA 95240 <br /> Samples Analyzed: J21044-45 (composite), <br /> J21046-47(composite),and J21048 throughJ21055 <br /> Sample Spiked: J21050 <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> %Recovery Duplicate% Percent <br /> Recovery Difference M) <br /> Methyl tert-Butyl Ether 93.0 93.3 0.3 ND <br /> Diisopropyl Ether 101.1 100.9 0.2 ND <br /> Ethyl tert-Butyl Ether 106.3 106.3 0.0 ND <br /> tert-Amyl Methyl Ether 98.2 98.1 0.1 ND <br /> Donna Keller <br /> Chemist <br /> Certification # 1157 Laboratory Director <br />