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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • .Redwood City, CA 94063 <br /> 415 364-9600 • :FAX(415)-364-9233 <br /> ;;RESNA Client Project ID:.86102-7, Station 492 <br /> `42501 Albrae Street, Suite 100 <br /> Fremont, CA 94538 <br /> Attention: AnthonV Enerio 0C Sample Group. 202-3842 Reported Mar 3, 1992 <br /> j - <br /> QUALITYCONTROLDATA REPORT <br /> ANALYTE _ <br /> Lead <br /> Method: EPA 6010 <br /> Analyst: C.Medefesser <br /> Reporting Units.: mg/.kg <br /> Date Analyzed; Feb.26, 1992." <br /> OC Sample#: 202-3331 - <br /> Sample Cone.:. 10 <br /> ..,Spike Cone. <br /> Added: 100 <br /> Conc. Matrix <br /> Spike: 100 <br /> Matrix Spike - - <br /> % Recovery: 90 - <br /> Conc. Matrix <br /> Spike Dup.: 110 <br /> Matrix Spike. <br /> 'r Duplicate <br /> % Recovery: 100 _ <br /> Relative <br /> % Difference: 9.5 <br /> +++ b SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of.Sample x 100 <br /> Spike Conc..Added <br /> �.. Relative%Difference:. Conc.of M.S.-Conc.of M.S.D., x 100. <br /> is L (Conc.of M.S. +-Conc.of M,S.D.) 2 <br /> P Oject Manager _ 2023842.ENS <2> <br /> 1. �,.. <br />