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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Ib <br /> Waterwork Client Project : #490, Thorpe /Weber Ave. <br /> 1710 Main Street <br /> .Escalon, CA 95320 <br /> Attention: Bill Channell QC Sample Group: 1041933-1934 Reported: Apr 25, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead <br /> Method: EPA 7421 <br /> Analyst: N. Herrera <br /> Reporting Units: mg/k9 <br /> Date Analyzed: Apr 17, 1991 <br /> QC Sample #: 104-0380 <br /> Sample Cone.: 0.023 <br /> Spike Cone. <br /> Added: 0.20 <br /> Cone. Matrix <br /> Spike: 0.19 <br /> Matrix Spike <br /> % Recovery: 84 <br /> Cone. Matrix <br /> Spike Dup.: 0.20 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 89 <br /> Relative <br /> % Difference: 5.1 <br /> JElab <br /> OIA ANALYTIC %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> QQQ/ 1 Spike Conc.Added <br /> � c ' / Relative%Difference: Conc.of M.S.-Conc.of M.S.D. z 100 <br /> th Hac I (Conc.ofM.S. iConc.ofM.S.D.) z Manager 1041931.WAT <7> <br />