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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# J162-07 Date: 6/17/98 <br /> Lab ID Dates Analyzed: 6/15-6/16/98 <br /> Thorpe Oil Method: 8020 <br /> 351 N Beckman <br /> Lodi CA 95240 <br /> Samples Analyzed: J20810 through J20831 <br /> Sample Spiked: J20837 <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> %Recovery Duplicate % Percent <br /> Recovery Difference (%) <br /> Benzene 82.2 85.6 4.1 ND <br /> Toluene 81.9 86.1 5.0 ND <br /> Ethyl Benzene 111.0 116.2 4.6 ND <br /> Gasoline 101.8 97.1 4.7 ND <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />