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GeoAnalytical Laboratories , Inc . <br /> 1405 Kansas Avenue Phone ( 209 ) 572 -0900 <br /> Modesto , CA 95351 FAX ( 209) 572-0916 <br /> i <br /> QC REPORT <br /> Report# J247-11 Date: 09/13/98 <br /> i <br /> Lab ID Dates Analyzed: 9/ 10-9/12/98 <br /> i <br /> Thorpe Oil Method: 8020 <br /> 351 N Beckman <br /> Lodi CA 95240 <br /> Samples Analyzed: J21584 through J21593 <br /> Sample Spiked: Organic Free Sand <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> Recovery Duplicate % Percent <br /> Recovery Difference (%) <br /> Methy tert-Butyl Ether 91 .9 91 .0 0.9 ND <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />