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SETA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415)364-9600 FAX(415)364.9233 <br /> Materworls Client Project ID. #490,Thorpe/Weber Ave. <br /> 1710 Main 81reet <br /> I <br /> Escalon,CA 95320 Reported:Apr 25 1991 <br /> : Attention• 13111 Channell QC Sample Croup 1041933 1934 re y 14 ,? <br /> � <br /> QUALITY CONTROL DATA REPORT <br /> AlJALYTE <br /> Lead <br /> Method: EPA7421 <br /> Analyst: N.Herrera <br /> Reporting Units: mg/kg <br /> Date Analyzed: Apr 17. 1991 <br /> QC Sample : 104-0380 <br /> Sample Conc.: 0.023 <br /> Spike Cone. <br /> Added: 0.20 <br /> Cone.Matrix <br /> Spike: 0.19 <br /> Matrix Spike <br /> %Recovery: 84 <br /> Conc.Matrix <br /> Spike Dup.: 0.20 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 89 <br /> Relative <br /> %Dlflerence: 5.1 <br /> Sw OIA ANALYTIC x.R000very: Cane.of M.S.-Cone.of Sample x 1R0 <br /> ?za <br /> $jike Conc.Added <br /> Relative%Utterance: Conc.of M.S.•Cone.of M.S.A, x 100 <br /> _W....Ftaekl (Conc.of M.S , cone.al M.S.D.)anager <br /> 1 <br />