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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# K026-09 Date: 2/3/99 <br /> Dates Analyzed: 1/31/99-2/1/99 <br /> Thorpe Oil Method: 8260 <br /> PO Box 357 <br /> Lodi CA 95241-0357 <br /> Samples Analyzed: K20319,21,22 <br /> Sample Spiked: K20275 <br /> Analyte Matrix Spike Matrix Spike RPD Blank <br /> %Recovery Duplicate % <br /> Recovery <br /> Methyl tertiary-Butyl Ether 110.6 106.7 3.6 ND <br /> Di-isopropyl ether 115.0 118.2 2.8 ND <br /> Ethyl tertiary-Butyl Ether 111.6 111.8 0.2 ND <br /> tertiary-Amyl Methyl Ether 114.9 109.8 4.6 ND <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />