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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. City of Stockton, Banner Island <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention: Bill Channell QC Sample Group: 911.0869 Reported: Dec 11, 1989 <br /> DUALITY CONTROL DATA REPORT <br /> ANALYTE Selenium Lead Mbmony Thallium Arsenic Mercury <br /> Method: EPA 7740 EPA 7421 EPA 6010 EPA 6010 EPA 7061 EPA 7470 <br /> Analyst: R. Britton R. Britton D. Herrera D. Herrera K Lewis K Lewis <br /> Reporting Units: mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Nor 2a, 1989 Nov 21, 19&9 Nov 22 19M Nov 22. 1989 Nov 21, 1989 Nov 21, 1989 <br /> OC Sample*: 911-2122 9112122 9112122 9112122 9111806 9111236 <br /> Sample Conc.: 0.023 1.6 0.173 N.D. 0.001 N.D. <br /> Spike Conc. <br /> r� <br /> Added: 10 500 1.0 10.0 0.010 0.010 <br /> Conc. Matrix <br /> 46 <br /> Spike: 8.9 470 1.45 8.39 0.011 0.011 <br /> Matra Spike <br /> %Recovery: 89 94 127.5 83.9 100.0 110 <br /> Conc. Matrix <br /> Spike Dup.: 9.0 500 3.93 9.34 0.011 0.0092 <br /> Matra Spike <br /> Duplicate <br /> %Recovery: 90 100 376 93.4 100.0 92 <br /> Relative <br /> %Difference: 1.1 6.2 922 10.7 0 17.6 <br /> SEQUOIA ANALYTI AL %Faeoovery: Cone.of M.S..Cone.of Samole x 100 <br /> Spike Conc.At]OeC <br /> Relative%Difference: Cone.of M.S..Conc.of M.S.D. z 100 <br /> ejo6A. Bjorkman (Cone.of M.$. . Conc.of M.S.0.)/2 <br /> Project Manager 9110869.WAT :4> <br />