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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:W0602.1 B.City of Stockton/Banner Island <br /> 1710 Main Street <br /> ti Escaion,CA 96320 <br /> tAttention BIH Channell OC Sample Group 2032357-63 Reported Mar 24, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> - ANALYTE <br /> U.ea S*WfWm <br /> Method: EPA 7421 EPA 7471 EPA 0010 <br /> Analyst: S.Chin d Manirn: M.Misty <br /> Reporting Units: mg/kg mg/kg mg/kg <br /> Date Analyzed: Mar 17, 1992 Mar 1a, low Mar 17, ton <br /> OC Sample*: 2032344 203,2383 2032343 <br /> Sample Conc.: 3.5 N.D. N.D. <br /> Spike Conc. <br /> Added: 50 0.10 50 <br /> • Conc. Matrix <br /> Spike: 54 0.10 41 <br /> Matrix Spike <br /> %Recovery: 100 100 62 <br /> Conc. Matrix <br /> Spike Dup.: 52 0.10 41 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 97 100 82 <br /> Relative <br /> %Difference: 3.7 0.0 0.0 <br /> SEQUOIA ANALYTICAL %woor.ryr Conc.a M.S.-Conc.of SamWe 1100 <br /> Spike Conc AOoeo <br /> Q C� Relative%Ditterenoa. Cone.of M.S.-Conc.of M.S.D. :1ok- <br /> (Cone.a M.S. • Cono.of M.S.D.) 2 <br /> P eG Manager 2032W.WAT <1a> <br />