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14 <br /> a v <br /> GeoAnalytical Laboratories , Inc . <br /> 1405 Kansas Avenue Phone ( 209 ) 572 - 0900 <br /> Modesto , CA 95351 FAX (209 ) 572-0916 <br /> QC REPORT <br /> Report# J247-11 Date : 09 / 13/98 <br /> Lab ID Dates Analyzed: 9/ 10-9/12/98 <br /> Thorpe Oil Method: 8020 <br /> 351 N Beckman <br /> Lodi CA 95240 <br /> Samples Analyzed: J21584throughJ21593 <br /> Sample Spiked: Organic Free Sand <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> Recovery Duplicate % Percent <br /> Recovery Difference (%) <br /> Benzene 97.4 98 . 1 0.7 ND <br /> Toluene 94.1 95.2 1 .2 ND <br /> Ethyl Benzene 98.6 99.5 1 .0 ND <br /> Gasoline 103.2 104.6 1 .3 ND <br /> Sylvia Krenn Donna Her _- <br /> Chemist Certification # 1157 Laboratory Director <br />