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r <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> Client Project ID: W0195.00, Western Stone Products%'1`racynM� <br /> :1710 Main Street <br /> <Escalon, CA 95320 <br /> r <br /> :Attention: Greg Stahl QC Sample Group: 2101840-1 Reported: Oct 27, 1992 <br /> :::..............::.....................:.::::. <br /> I <br /> QUALITY CONTROL DATA REPORT I <br /> ANALYTE Ethyl- Extractable <br /> Benzene Toluene benzene Xylenes Hydrocarbons <br /> i <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst: M.Nipp M.Kipp M.Nipp M.Nipp R.Lee <br /> Reporting Units: pg/L pg/L Ng/L yg/L {rg/L <br /> Date Analyzed: Oct 15, 1992 Oct 15, 1992 Oct 15, 1992 Oct 15, 1992 Oct 13, 1992 1 <br /> QC Sample#: GBLK101592 GBLK101592 GBLK101592 GBLK101592 4DBLK101292X <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> Sample Cone.: N.D. N.D. N.D. N.D. N.D. <br /> Spike Cone. <br /> Added: 10 10 10 30 300 <br /> Conc. Matrix <br /> Spike: 9.6 9.6 9.6 29 210 <br /> E. <br /> f <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 70 <br /> Relative <br /> •Difference: 4.1 4.1 4.1 3.4 0.0 <br /> I <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample X100 1 <br /> Spike Conc.Added <br /> //,��(/�///(�/�► Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> r Lee (Cont.of M.S. + Conc.of M.S.D.) 2 <br /> roject Manager 2101840.WAT <7> <br /> i <br />