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_ m <br /> — d <br /> , <br /> � GgF}S <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento. CA 95834 <br /> (916) 921.9600 • FAX(916)921-0100 <br /> RESNA Industries Client Project ID:Arco #2130,Stockton <br /> :3164 Gold Camp Drive,Suite 200 <br /> ;Rancho Cordova,CA 95670 <br /> ::Attention Eloise Frick QC Sample Group: 112-0543 Reported: Dec 26 1991 <br /> .: s <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE - E1hyf- —_ <br /> Benzene Toluene Benzene Xylenes Lead } <br /> Method: EPA 5020 EPA 8020 EPA 8020 EPA 6020 EPA 6010 <br /> Analyst: C.Chapman C.Chapman C.Chapman C.Chapman S.Fasler <br /> Reporting Units: ppm ppm ppm ppm mg/kg ' <br /> ey Date Analyzed: Dec 20, 1991 Dec 20, 1991 Dec 20, 1991 Dec 20, 1991 Dec 26, 1991 f <br /> QC Sample#: 112-0439 112-0439 112.0439 112-0439 112-04a8 <br /> k <br /> F <br /> Sampler Conc.: N.D. N.D. N.D. N.D. N.D. <br /> Spike Cone. <br /> Added: 0.2 0.2 0.2 0.4 50 <br /> Cone.Matrix <br /> F <br /> £pike: 0.18 0.18 0.19 0.39 43 <br /> Matrix Spike <br /> %Recovery: 90 90 95 98 86 1 <br /> f <br /> F <br /> �+ Conc.Matrix <br /> Spike Dup.: 0.19 0.2 0.21 0.42 42 <br /> I <br /> Ma!rix Spike <br /> Duplicate <br /> %Recovery: 95100 100 100 84 t <br /> Relative i <br /> %Difference: 5.4 10 10 7.4 2.4 <br /> f SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.•Conc.of Sample x 100 <br /> //�/(, Spike Conc.Added <br /> /Nt Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> '-' Mlchael R.Giles <br /> y (Conc.of M.S.+Conc.of M.S.D.)/2 <br /> Laboratory Director 1120543.RES c3? <br /> Rings <br /> of <br />