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GeoAnalytical Laboratories, Inc. <br />1405 Kansas Avenue Phone (209) 572-0900 <br />Modesto, CA 95351 FAX (209) 572-0916 <br />Report# J183-09 <br />Lab ID <br />Thorpe Oil <br />351 N Beckman <br />Lodi CA 95240 <br />Samples Analyzed: J20996 through J21015 <br />Sample Spiked: Method Spike <br />Analyte <br />Benzene <br />Toluene <br />Ethyl Benzene <br />Gasoline <br />( Sylvia Krenn <br />Chemist <br />QC REPORT <br />Date: 7/14/98 <br />Dates Analyzed: 7/9-7/13/98 <br />Method: 8020 <br />Method Spike Method Spike Relative <br />% Recovery <br />Duplicate % <br />Percent <br />Recovery <br />Difference (%) <br />97.6 <br />96.6 <br />1.0 <br />94.1 <br />93.8 <br />0.3 <br />95.8 <br />95.4 <br />0.5 <br />104.1 <br />104.0 <br />0.1 <br />Certification # 1157 <br />Blank <br />ND <br />ND <br />ND <br />ND <br />Donna Keller <br />Laboratory Director <br />