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' ' I <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> .:.......:.:�ient Project ID: W0�.:...-:.::.,..:.:..,:..::::.�:.:.195.00,Western Stone Products/Tracy :::;:::;.:;.>:.::: <br /> 1RESNA Cl <br /> 1710 Main Street <br /> 'Escalon, CA 95320 <br /> Attention: Greg Stahl QC Sample Group: 2101840-1 Reported: Oct 27 1992 <br /> >,:.w:0a.:w:.w»;•. <br /> ... , <br /> QUALITY CONTROL DATA REPORT I <br /> ANALYTE Ethyl- <br /> Benzene Toluene benzene Xylenes <br /> i <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 pg/L pg/L p9/L <br /> Date Analyzed: Oct 16, 1992 Oct 16, 1992 Oct 16, 1992 Oct 16, 1992 <br /> QC Sample#: GSLK101692 GBLK101692 GBLK1o1692 GBLK101692 <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> Spike Cone. <br /> Added: 10 10 10 30 <br /> i <br /> Cone. Matrix <br /> Spike: 9.9 9.9 9.9 30 <br /> Matrix Spike <br /> %Recovery: 99 99 99 100 <br /> I <br /> Cone.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 /> SEQUOIA ANALYTICAL %Recovery: Cone.of M.S.-Cone.of Sample z 100 <br /> Spike Conc.Added <br /> Relative%Difference: Cone.of M.S.-Cone.of M.S.D. x 100 <br /> eerojictMa (Cone.of M.S. + Cone.of M.S.D.) 2anager 2101840.WAT <a> <br />