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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <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 /> Method EPA 239 2 <br /> Analyst M Mistry <br /> Reporting Units mg/L <br /> Date Analyzed Jan 27 1492 <br /> OC Sample # 201-3115 <br /> Sample Conc . N D <br /> Spike Conc. <br /> Added: 10 <br /> Conc. Matrix <br /> Spike 10 <br /> Matrix Spike <br /> % Recovery: 100 <br /> Conc. Matrix <br /> Sr)ekp seen 1 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 <br /> Relative <br /> I %Difference: 110 <br /> 6 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> 'C1L- �✓t-- larive%Difference Conc of M S -Conc of M 5 D x 100 <br /> JMalle`A Springer (Conc of M S + Conc of M S 0)/2 <br /> Project Manager 2012775 EEE <11> <br />