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SEQUOIA ANALYTICAL <br /> k rive • Redwood Cit <br /> 680 Chesapeake D y, CA 94063 <br /> (475) 364-9600 • PAX (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 -76 , 78 Reported Jan 30, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> IMethod EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Llaikhtman LLaikhtman LLaikhtman L Laikhtman <br /> Reporting Units ug/L ug/L N9/L N9/L <br /> I Date Analyzed Jan 22 1992 Jan 22, 1992 Jan 22 1992 Jan 22, 1992 <br /> OC Sample # BLK012292 BLK012292 BLK012292 BLK012292 <br /> Sample Cone. N D N D N D N D <br /> Spike Conc. <br /> Added. 10 10 10 30 <br /> Conc. Matrix <br /> Spike: 92 93 94 29 <br /> IMatnx Spike <br /> %Recovery: 92 93 94 97 <br /> IConc. Matrix <br /> lqnike Duo - A l 93 95 28 <br /> i Matrix Spike <br /> i Duplicate <br /> %Recovery- 91 93 95 93 <br /> Relative <br /> %Difference: 10 00 10 35 <br /> i <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Made A. Spnnger (Cone of M S + Cone of M S D)/2 <br /> Project Manager _ 2012775 EEE <8> <br />