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SEIUO ► ANALYTICAL <br /> V <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> 1 � <br /> wi::rvwwnm�l«.v"nv%S.'!w':w'. .:.�� ..:!.i� :::::::. .." ...... <br /> .... ....::<: <br /> +Y <br /> NA Client Project ID: W0195.00,Western Stone Products/Tracy <br /> RE <br /> 1710 Main Street <br /> Escafon, CA 95320 <br /> sAttention: Greg Stahl QC Sample Group: 2101840-1 Report Oct 27, 1992 <br /> .._.:, .:......n... .:•.:...... ...,,nys^x,,.w.r-a„»:..>y:..:;H,,o,:..�..;.>:F: :�c>:n.;..i.. n..,: <br /> i; <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene benzene Xylenes j <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: M.Nipp M.Nipp M.Nipp M.Nipp <br /> Reporting Units: Pg/L kg/L v9/L Pg/L <br /> Date Analyzed: Oct 16, 1992 Oct 16, 1992 Oct 16, 1992 Oct 16, 1992 <br /> QC Sample#: GBLK101692 6BLK101692 GBLK101692 GBLK101692 <br /> MS/MSD f MS/MSD MS/MSD MS/MSO <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 10 10 10 30 <br /> Conc. Matrix <br /> Spike: 9.9 9.9 9.9 30 <br /> Matrix Spike <br /> %Recovery: 99 99 99 100 <br /> Conc. Matrix <br /> Spike Dup.: 10 10 9.9 30 <br /> Matrix Spike <br /> Duplicate <br /> •Recovery: 100 100 99 100 <br /> Relative <br /> %Difference: 1.0 1.0 0.0 0.0 <br /> IV <br /> SEQUOIA ANALYTICAL %Recovery. Conc.of M.S.-Conc.of Sample x 100 ' <br /> Spike Conc.Added 'I <br /> FrojeRelative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> c <br /> e (Conc.of M.S. + Conc.of M.S.D.) 2 <br /> anager 2101SQ.wAT <8> <br />