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_ y � <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue. Suite 8 • Sacramento. CA 95834 <br /> (916) 921.9600 • FAX (916) 921-0100 <br /> RESNA Industries.µ, C,'ient Project ID:Arco#2130,Stockton <br /> :3164 Gold Camp Drive.Suite 200 <br /> Rancho Cordova.CA 95670 <br /> Attention Eloise Frick QC Sample Group 1120585-90 Reported Jan 3. 1992. <br /> DUALITY CONTROL DATA REPORT <br /> f , <br /> I� <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> I <br /> Method: EPA 8020 EPA 602D EPA 8020 EPA 8020 <br /> Analyst: K.Mill K.Nils K.Nil K.Mill <br /> J Reporting Units: ppm ppm Pam ppm <br /> j Date Analyzed: Doc 31, 1992 Dec 31, 1992 066.31, 1992 Dec 31, 1992 <br /> QC Sample : Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> j <br /> 4 <br /> Sample Conc.: N.D. N.D. N.D. N.D. j <br /> # r <br /> Spike Conc. ? <br /> Added: 0.4 0.4 0.4 1.2trix <br /> I <br /> Conc.Ma <br /> 10 Spike: 0.39 0.39 0.42 1.3 <br /> 3 Matrix Spike <br /> %Recovery: 98 98 105 108 <br /> Conc.Mltrlx <br /> Spike Dup.: 0.4 0.4 0.45 L3 <br /> Matrix Spike <br /> Dupiicateery: <br /> ,j %Recov100 100 112 108 <br /> Relative — -- – — -- -- – --- }- –_—_ - <br /> %Difference: 2.5 2.5 6.9 0.0 <br /> SEQUOIA ANALYTICAL ^G Recovery: Conc.of M.S.-Cons of Sample x 100 <br /> Os <br /> SCone-Added <br /> /1'•�//S/,' Y t Aolative%Ditfarenee: Cane.of M.S.-Cone.of M.S.D. z 100 <br /> i Mk:hael R.Giles (Conc.of M.S.+Conc.of M.S.D.)/2 <br /> boi <br /> Laratory©irectar 112asae.RES ts: j <br />