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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# J141-17 Date: 05/28/98 <br /> Lab ID Dates Analyzed: 5/27/98-5/28/98 <br /> Thorpe Oil Method: 8020 <br /> 351 N Beckman <br /> Lodi CA 95240 <br /> Samples Analyzed: J20672 through J20683 <br /> Sample Spiked: Method Spike <br /> Analyte Method Spike Method Spike Relative Blank <br /> %Recovery Duplicate % Percent <br /> Recovery Difference(%) <br /> Benzene 89.9 92.2 2.5 ND <br /> Toluene 88.8 89.6 0.90 ND <br /> Ethyl Benzene 114.5 115.5 0.83 ND <br /> Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />