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9 <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> ....... .......-..... ................. <br /> A <br /> Waterwork Client Project ID: #490,Thorpe Weber Ave. <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> : , <br /> .'..Attention: Bill Phan.n.e.1.1m....."I., QC Sample,Group;1-04-11933 ReportedMay 8 1991 <br /> M xox <br /> ......... **,......,�..��l..,,'.'*.:*,,:*.. ..**.. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Lead <br /> Method: EPA 239.2 <br /> Analyst: N. Herrera <br /> Reporting Units: mg/L <br /> Date Analyzed: May 7, 1991 <br /> OC 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 /> JE, <br /> %Recovery: Cone.of M.S.-Conc.of Sample X 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. X 100 <br /> rza (Conc.of M.S. + Conc.of M.S.D.)/2 10419aaWAT <3> <br /> Ole <br />