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S GeoAnalytical Laboratories, Inc. <br /> ■ 1405 Kansas Avenue Phone (209) 572-0900 <br /> Modesto, CA 95351 FAX (209) 572-0916 <br /> QC REPORT <br /> Report# I288-02 Date: 10/23/97 <br /> Lab ID Dates Analyzed: 10/21/97 <br /> American Geological Services Method: 8260 <br /> ' PO Box 3416 <br /> Sonora CA 95370 <br /> Samples Analyzed: 135015, 17, 19, 21,23 <br /> Sample Spiked: I35023 <br /> 1 <br /> Analyte Matrix Spike Matrix Spike RPD Blank <br /> % Recovery Duplicate % <br /> Recovery <br /> Metyl tertiary-Butyl Ether 92.1 86.6 6.2 ND <br /> Diisopropyl Ether 98.8 91.1 8.0 ND <br /> Ethyl tertiary-Butyl Ether 91.6 86.9 5.3 ND <br /> tertiary-Amyl Methyl Ether 90.0 87.4 3.0 ND <br /> ' Richard Meissner Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />