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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 i <br /> (415) 364-9600 - FAX(415) 364.9233 <br />' Emcon Associates Client Project ID 4445 Pershing, Ave, Stockton, Shell <br /> 1433 N Market Blvd <br /> Sacramento, CA 95834 <br />' Attention Sheila Kruse OC Sample Group 2012775 -78 Reported Jan 30, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE lead <br /> I Method EPA 239.2 <br /> Analyst M MISVy <br /> Reporting Units mg/L <br /> Date Analyzed ,tan 27, 1992 <br /> QC Sample # 201-3115 <br /> Sample Conc.: ND <br /> Spike Conc. <br /> Added: 10 <br /> Conc. Matrix <br /> Spike: 10 <br /> IMatrix Spike <br /> % Recovery: 100 <br /> Conc. Matrix <br /> SnikR Min - 4n <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 <br /> 1 <br /> Relative <br /> %Difference: 00 <br /> 6 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> �MSapn <br /> lative%Difference Conc of M S -Conc of M S 0 x100tAalle` nnger (Conc of M S + Conc of M S D)/2Projeager 2012775 EEE <-1 11> <br />