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r j SEQUOIAALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 , <br /> ..... v;,..::: xx:::v.:•nen.i.:}}w::nv <br /> :..::.::.:. <br /> �:frtr}:o-fl.. ..nu:a:.. - :.G:`.•- "' :.l:dc.^-:- �.V? <br /> .Tank Protect Engineering of N.Calif.. Client Project ID: #209/60 E. 10th St., Trac <br /> Y <br /> x;2821 Whipple Road Method (units): EPA 8010 (pg/1-purged) : Q.C. Sample.Dates <br /> ;Union City, CA 94587 Analyst(s): M. Nguyen ; <br /> F <br /> k'Attention: John Mrakovich QC Sample#: Blk112291 Analyzed: Nov 22, 1991 ,i <br /> S;. <br /> Re rt .< <br /> i <br /> Repo ed: DecDe <br /> 3 1991 <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. 10 13 130 13 130 0.0 <br /> ethene <br /> Trichloroethene N.D. 10 9.7 97 10100 3.0 r <br /> i <br /> Benzene N.D. 10 10 100 10 100 0.0 <br /> Toluene N.D. 10 9.3 93 9.2 92 1.1 <br /> Chlorobenzene N.D. 10 9.9 99 9.1 91 8.4 <br /> 1 <br /> 1 <br /> i <br /> S 0 1 ANA YTl L %Recovery: Conc.of M.S.-Conc.of Sample X.100 <br /> Spike Conc,Added <br /> Relative%Difference: Conc.of M.S.-Conc,of M.S.D. x 100 <br /> ulia . Male tein .(Conc,of M.S. + Conc,of KS.D.)/2 + <br /> roj t Manager :, .1110814.TPE <11> <br />