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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# K013-18 Date: 01/25/99 <br /> Dates Analyzed: 01/21/99-01/22/99 <br /> Cal, Inc Method: 8260 <br /> 2040 Peabody Rd.#400 <br /> Vacaville, CA 95687 <br /> Samples Analyzed: K20163-K20176 <br /> Sample Spiked: K20153 <br /> Analyte Matrix Spike Matrix Spike RPD Blank <br /> %Recovery Duplicate% <br /> Methyl tent-Butyl Ether 102.1 99.1 3.0 ND <br /> Di-isopropyl Ether 106.8 107.1 0.3 ND <br /> Ethyl tert-Butyl Ether 107.9 109.2 1.2 ND <br /> tert-Amyl Methyl Ether 106.6 107.4 0.8 ND <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />