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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# J363-10 Date: 01/04/99 <br /> Lab ID Dates Analyzed: 12/31/98 <br /> C.L. Bryant Method: 8260 <br /> 237 E. Whitmore Ave. <br /> Modesto,CA 95354 <br /> Samples Analyzed: J22727,J22728,J22729,J22730,J22731,J22732,J22733,J22734,J22735,J22736 <br /> Sample Spiked: J22734 <br /> Analyte Matrix Spike Matrix Spike RPD Blank <br /> %Recovery Duplicate % <br /> Recovery <br /> Methyl tert-Butyl Ether 108.0 106.6 1.4 ND <br /> Di-isopropyl Ether 108.1 108.2 0.0 ND <br /> Ethyl tert-Butyl Ether 109.6 109.2 0.3 ND <br /> tert-Amyl Methyl Ether 113.4 111.8 1.4 ND <br /> ASylvian Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />