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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 b: #490,Thorpe/Weber Ave. <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> :Attention: Bill Channell QC Sample Group: 104-1933 Reported May 8 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead <br /> Method: EPA 239.2 <br /> Analyst: N.Herrefa <br /> Reporting Units: mg/L <br /> Date Analyzed: May 7, 1991 <br /> QC Sample#: 104-1933 <br /> Sample Conc.: 0.092 <br /> Spike Conc. <br /> Added: 0.10 <br /> Conc. Matrix <br /> Spike: 0.22 <br /> Matrix Spike <br /> %Recovery: 130 <br /> Conc. Matrix <br /> Spike Dup.: 0.20 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 110 <br /> Relative <br /> % Difference: 9.5 <br /> S <br /> E ©IA ANALYTIC,�L %Recovery: Conc.of M.S,-Conc.of Sample x 100 <br /> Spike Conc.Added <br /> Z Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> W. Hac I (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> t Manager 1041933,WAT <3> <br />