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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 /> • <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> % Recovery Duplicate %p Percent <br /> Recovery Difference f%) <br /> Benzene 82 2 85 6 41 ND <br /> Toluene 819 861 5 0 ND <br /> Ethyl Benzene 1110 1162 46 ND <br /> Gasoline 1018 971 4 7 ND <br /> i <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />