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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# J147-01 <br />Lab ID <br />Thorpe Oil <br />351 N Beckman <br />Lodi CA 95240 <br />Date: 6/3/98 <br />Dates Analyzed: 6/1-6/2/98 <br />Samples Analyzed: J20715-18 (compoosite) and J20719 through J20724 <br />Sample Spiked: J20723 <br />Analyte <br />Method: 8020 <br />Matrix Spike Matrix Spike Relative <br />% Recovery Duplicate % Percent <br />Recovery Difference (%) <br />Blank <br />Benzene <br />90.1 <br />88.8 <br />1.4 <br />ND <br />Toluene <br />88.2 <br />86.7 <br />1.6 <br />ND <br />Ethyl Benzene <br />119.5 <br />116.9 <br />2.2 <br />ND <br />Gasoline <br />104.4 <br />101.8 <br />2.5 <br />ND <br />iyI)Krerm <br />Chemist <br />Certification # 1157 <br />r <br />Donna Keller <br />Laboratory Director <br />