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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# J148-04 <br />Lab ID <br />Thorpe Oil <br />351 N Beckman <br />Lodi CA 95240 <br />Samples Analyzed: J20725, J20726 <br />Sample Spiked: J32566 <br />Analyte <br />Date: 6/3/98 <br />Dates Analyzed: 6/2/98 <br />Method: 8240 <br />Matrix Spike Matrix Spike Relative <br />% Recovery Duplicate % Percent <br />Recovery Difference (%) <br />Blank <br />1,1-Dichloroethene <br />120.3 <br />120.1 <br />0.20 <br />ND <br />Trichloroethene <br />109.0 <br />107.1 <br />1.9 <br />ND <br />Chlorobenzene <br />103.7 <br />101.8 <br />1.9 <br />ND <br />Toluene <br />109.2 <br />104.2 <br />4.7 <br />ND <br />Benzene <br />113.3 <br />111.2 <br />1.8 <br />ND <br />Sylvia Krenn <br />Chemist <br />Certification # 1157 <br />Donna Keller <br />Laboratory Director <br />