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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 201-2777 Reported Jan 30, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> Reporting Units u9/L u9/L N9/L p9/1- <br /> Date <br /> 9/LDate Analyzed Jan 22, 1992 Jan 22. 1992 Jan 22, 1992 Jan 22, 1992 <br /> OC Sample# GBLK012292 GBLK012292 GBLK012292 GBLK012292 <br /> Sample Conc . N D N D N D N D <br /> Spike Conc. <br /> Added: 10 10 10 30 <br /> I Conc. Matrix <br /> Spike 90 93 9 3 28 <br /> E Matrix Spike <br /> %Recovery: 90 93 93 93 <br /> Conc. Matrix <br /> Soike Duo : 91 95 9 4 9q <br /> Matrix Spike - <br /> Duplicate <br /> %Recovery: 91 95 94 97 <br /> Relative <br /> %Difference- 1 1 21 1 1 35 <br /> 6 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Wa1IWr" f Relative%Difference Conc of M S -Conc of M S D x 100 <br /> A"Sp ager (Conc of M S + Cana of M S D)/2 <br /> Project Manager 2012775 EEE <9> <br />