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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 9x063 F <br /> (415) 364-9600 FAX (415) 364-9233 <br /> OH aterlals Co ration °" "` ` > ' i <br /> Client Project 1D: Sheldon 01/ 10387 <br /> I.}1425 N.W. Market Blvd., Suite 9 <br /> Sacramento, CA 95834 <br /> Atientlan: Vince Rose OC Sample Group: R1043119 eA--GWComp,-a Reported: May 3, 1991 <br /> r <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Ethyl <br /> Diesel Benzene Toluene Benzene Xylenes <br /> Method: EPA 8015 EPA 8020 EPA 20E0 EPA 8020 Epp grasp I <br /> Analyst: FL Lee M.Nguyen M.Nguyen M.Nguyen M.Nguyen <br /> Reporting Units: ng ng ng ng n0 <br /> Date Analyzed: May 1. 1991 May 2, 1991 May 2. 1991 May 2, 1991 May 2, 1991 <br /> OC Sample#: DBLK 050191 GBLK 050291 GBLK 050291 GBLK 050291 GBLK 05=1 <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> } <br /> Spike Cana <br /> Added: 900 100 .100 100 300 <br /> i <br /> Conc. Matrix <br /> Spike: 690 100 100 100 310 <br /> Matrix Spike <br /> % Recovery: 77 100 100 100 100 <br /> Cone. Matrix <br /> Spike Dup.: 688 99 100 100 300 <br /> Matrix Spike <br /> i Duplicate <br /> % Recovery: 76 99 100 100 100 <br /> i <br /> Relative <br /> % Difference: 1.5 1.0 0.0 0.0 3.3 <br /> SEQUOIA ANALYTICAL. %Recovery: Cont.of M.S.--Cone-of Sample x too <br /> Spike Cone.lidded <br /> _ live%Dilferenor: Cone,of M.S.-CWW_of M.S.D. x 100 <br /> izab <br /> Eleth W.7hlacld J (C:onc,of AILS+Cone.01 M S.D.) .2 i <br /> Project Manager <br /> R1043119.000 c3> <br /> .. _.. ' •t4¢f•.Y. * u r ti s's x kr"{,n a...:.` �. a,s.4;'M.,-ca4,4. +..*--is i <br />