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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City,CA 94063 <br /> �..� (415) 364-9600 - FAX (415) 364-9233 <br /> i <br /> i <br /> Waterwork Client Project ID. #20198-1.Stockton/Banner Island <br /> :1710 Main Street <br /> Escalon, CA 95320 Reported Nov 29. 1989 <br /> Attention: Dave Welch OC Sample Group <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Sa4nwm Arsenic Laad Thallium ZJnc <br /> Method: EPA 7740 EPA 7061 EPA 7421 EPA 6010 EPA 6010 <br /> Analyst: R. Britton K Lewis R. Britton D. Herrera D. Herrera <br /> Reporting Units: Ng/L Ng/L pg/L mg/L mg/L <br /> Date Analyzed: Nov 20, 1989 Nov 22, 1989 Nov 27, 1989 Nov 22. 1989 Nov 22, 1989 <br /> OC Sample#: 911-0695 9112147 9110695 9112122 9112122 <br /> Sample Conc.: 17 N.D. 50 N.D. 1.37 <br /> Spike Cone <br /> Added: 20000 10 20000 10 10 <br /> f <br /> Cones Matrix <br /> Spike: 20000 10 15000 8.39 11.18 <br /> Matrix Spike <br /> %Recovery: 100 100 75 83.9 98.1 <br /> Cone. Matrix <br /> Spike Dup.: 22000 10 17000 9.34 10.73 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 110 100 85 93.4 93.6 <br /> Relative <br /> %Difference: 9.5 0 13 11 4.0 <br /> SEQUOIA ANALYT) L %Raoov".. Cone of M.S..Cone of Samoie x 100 <br /> Spike COM.AddW <br /> P*sv a%Differanca: Conc.of M.S.-COnc.of M.S.D. x 100 <br /> O A. B orkman IConc.of M.S. + Conc.of M.5.0.1 2 <br /> P Manager 911089SA.WAT <3 <br />