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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# J147-01 <br />Lab ID <br />Thorpe Oil <br />351 N Beckman <br />Lodi CA 95240 <br />Samples Analyzed: J20715-8 (composite) and J20719 through J20724 <br />Sample Spiked: J20719 <br />Analyte <br />Diisopropyl Ether <br />Ethyl tert-Butyl Ether <br />tert-Amyl Methyl Ether <br />-- <br />kylvierm 2 <br />Chemist <br />Date: 6/3/98 <br />Dates Analyzed: 6/1-6/2/98 <br />Method: 8260 <br />Matrix Spike <br />Matrix Spike <br />Relative <br />Blank <br />% Recovery <br />Duplicate % <br />Percent <br />Recovery <br />Difference M <br />107.6 <br />102.5 <br />4.9 <br />ND <br />101.0 <br />96.6 <br />4.5 <br />ND <br />92.8 <br />88.0 <br />5.3 <br />ND <br />Certification # 1157 <br />Donna Keller <br />Laboratory Director <br />