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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# J142-04 Date: 6/1/98 <br /> Lab ID Dates Analyzed: 5/28-5/29 <br /> Thorpe Oil Method: 8020 <br /> 351 N Beckman <br /> Lodi CA 95240 <br /> Samples Analyzed: J20684 through J20708 <br /> Sample Spiked: J20690 <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> %Recovery Duplicate % Percent <br /> Recovery Difference(%) <br /> Benzene 85.9 86.6 0.74 ND <br /> Toluene 84.3 84.6 0.38 ND <br /> Ethyl Benzene 121.3 121.4 0.13 ND <br /> S via Kr nn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />