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i�4 <br /> j) SEQUOIA ANALYTICAL <br /> IV 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 Method (units): EPA 8240 (Ng/L purged) O.C. Sample Dates <br /> Escalon, CA 95320 Analyst(s): T. Fowler <br /> Attention: Bill Channell OC Sample#: 911-0853 Analyzed: Nov 16, 1989 <br /> Reported: Nov 22, 1989 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Conc. Matrix Spike <br /> Conc. Spike Matrix Duplicate Relative <br /> Sample Spike Conc. Matrix % Spike % % <br /> Analyte Conc. Added Spike Recovery. Duplicate Recovery Difference <br /> 1,1-Dichloro- N.D. 50 45 90 55 110 20 <br /> ethene <br /> Trichloroethene N.D. 50 45 90 46 92 2.2 <br /> Benzene N.D. 50 47 94 47 94 0 <br /> Toluene N.D. 50 50 100 44 88 13 <br /> f Chlorobenzene N.D. 50 47 94 44 88 6.6 <br /> SEOUOIA ANALYTI AL %Raoovery: Conc.of M.S.-Conc.of Sampie z 100 <br /> Spike Conc.Added <br /> ® Relative%tiffKance: Conc.of M.S.-Cone.of M.S.D. X100 <br /> i m A. 81orkman (Conc.of M.S. • Conc.of M.S.D.) 2 <br /> r 'ect Manager 9110e56.wAT <>> <br />