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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> Waterwork <br /> Client Project ID #20198-1, Stockton/Banner Island <br /> .1710 Main Street Method (units): EPA 8240 <br /> Escalon, CA 96320 Analyst(s): T. Fowler (N9/L purged) O.C. Sample Dates <br /> Attention: Dave Welch OC Sample#: 911-0980 <br /> Analyzed: Nov 20, 1989 <br /> Reported: Nov 29, 1989 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Conc. Matrix Spike <br /> Conc. Spike Matrix Duplicate Relative <br /> Anal a Sample Spike Conc, Matrix % Spike <br /> Yt Conc. Added Spike Recovery Duplicate Recovery Difference <br /> 1,1-Dichloro- N.D. 50 50 100 47 <br /> ethene 94 6.2 <br /> Trichloroethene N.D. 50 42 g4 q4 <br /> 88 4.6 <br /> Benzene N.D. 50 45 90 <br /> 46 92 2.2 <br /> Toluene N.D. 50 46 92 47 <br /> 94 2.1 <br /> Chlorobenzene N.D. 50 46 92 47 <br /> 94 2.1 <br /> SEQUOIA ANALYTI L %Reccrvwy, Gone.of M.S.-Cone.of$ampie x 100 <br /> Spike Conc.Aooed <br /> r Pa4athm%OW-ence: Cone.of M.S.-Cone.of M.S.D. n 100 <br /> j A. ejorkman iConc.of M.S. + Cone.or M.so)/2. . <br /> r ect Manager <br /> 911069saw,aT <e> <br />