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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# J183-09 <br />Lab ID <br />Thorpe Oil <br />351 N Beckman <br />Lodi CA 95240 <br />Samples Analyzed: J21010,J21011,J21012,J21013,J21014,J21015 <br />Sample Spiked: Method Spike <br />Analyte <br />Methyl tert-Butyl Ether <br />Diisopropyl Ether <br />Ethyl tert-Butyl Ether <br />tert-Amyl Methyl Ether <br />Chemist <br />Date: 07/10/98 <br />Dates Analyzed: 7/10/98 <br />Method: 8260 <br />Method Spike Method Spike Relative <br />% Recovery <br />Duplicate % <br />Percent <br />Recovery <br />Difference (%) <br />90.7 <br />93.3 <br />2.9 <br />95.7 <br />90.4 <br />5.6 <br />100.9 <br />94.9 <br />6.2 <br />96.5 <br />89.8 <br />7.2 <br />Certification # 1157 <br />Blank <br />ND <br />ND <br />ND <br />ND <br />Donna Keller <br />Laboratory Director <br />