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SEQUOIA LYTICAL <br /> 660 Chesapeake Drive • Redwood City,CA 94063 <br /> (415)364.9600 FAX(415)364.9233 <br /> Exce(tech Client Project ID. rtl349120.31,Quik Stop#120,PO#21008 <br /> :41674 Christy Street <br /> ;::Fremont,CA 94538 <br /> Attention <br /> John Monroe QC Sample Croup 0080771-787 Reported:Aug 22, 1990 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE- Lead <br /> r, Method: EPA 7421 <br /> Analyst: R Sharma <br /> Reporting Units: m0/ky <br /> Date Analyzed: Aura s, 1890 <br /> OC Sample#: 008.0787 <br /> Sample Cone.: 1.3 <br /> i <br /> Spike Cone. <br /> '— Added: 50 <br /> Cone.Matrix <br /> Spike: 48 <br /> x . <br /> Matrix Spike <br /> %Recovery: 93 <br /> Cone.Matrix <br /> Spike Dup.: 51 <br /> Matrix Spike <br /> Duplicate <br /> i %Recovery: 99 <br /> Relative <br /> %Difference: 6.1 <br /> SEQUOIA ANALYTICAL %Focowry: Corc.of M.S.-Cone,of Sample x 100 <br /> Spike Conc.Added <br /> EfVlf1111L <br /> yY Reladve%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Vickie Ta a (cores.of M.S.+Ccnc.of M.S.D.) 2 <br /> Project Manager <br /> � 80771.sfas csy <br />