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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Waterwork Client Project ID: #490, Thorpe Weber Ave. <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention: Bill Channell QC Sample Group: 1041931-1932 Reported Apr 25 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Diesel <br /> Method: EPA 8015 <br /> Analyst: K.Lee <br /> Reporting Units: mg/kg <br /> Date Analyzed: Apr 18, 1991 <br /> QC Sample#: eLK 041891 <br /> Sample Conc.: N.D. <br /> Spike Conc. <br /> Added: 10 <br /> Conic. Matrix <br /> Spike: 8.2 <br /> Matrix Spike <br /> % Recovery: 82 <br /> Conc. Matrix <br /> Spike Dup.: 8.4 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 84 <br /> Relative <br /> • Difference: 2.4 <br /> SE9 OIA ANALYTI( A %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> S70 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> ¢abeth W. Mack (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> roject Manager to41sa1.wA1 <s> <br />