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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> WSW <br /> *K�.......... <br /> R E S N A Client Project lb: W0195.00,Western Stone Products/Tracy <br /> 1710 Main Street <br /> "'.'..Escalon, CA 95320 <br /> '€Attentlon: Greg Stahl QC Sample Group::.:2101840-1 Reported: Oct 27, 1992 <br /> .......... <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Extractable <br /> Benzene Toluene benzene Xylenes Hydrocarbons <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst: M.Nipp M.Nipp M.Nipp M.Nipp R.Lee <br /> Reporting Units: pg/L pg/L pg/L yg/L ug/L <br /> Date Analyzed: Oct 15, 1992 Oct 15, 1992 Oct 15, 1992 Oct 15, 1992 Oct 13, 1992 <br /> OC Sample#: GBLK101592 GBLK101592 GBLK101592 GBLK101592 DBLK101292)( <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 10 10 10 30 300 <br /> Conc. Matrix <br /> Spike: 9.6 9.6 9.6 29 210 <br /> Matrix Spike <br /> %Recovery: 96 96 96 97 70 <br /> Conc. Matrix <br /> Spike Dup.: 10 10 10 30 210 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 100 100 . 100 <br /> Relative <br /> %Difference: 4.1 4.1 4.1 3.4 0.0 <br /> SEQUOIA ANALYTICAL %Recovery: Cone.of M.S.-Cone.of Sample X 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> r Lee (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> roject Manager 2101840.WAT <7> <br />