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I SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 940153 4 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> Emcon Associates Client Project ID 4445 Pershing, Ave, Stockton, Shell v <br /> 1433 N Market Blvd <br /> Sacramento, CA 95834 <br /> Attention Sheila Kruse OC Sample Group 2012775-76, 78 w Reported Jan 30, 1992 <br />' QUALITY CONTROL DATA REPORT <br /> I ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst LLaukhtrnan LLaikhtman LLwkhtman Uaikhtman <br /> Reporting Units ug/L pre/L pg/L pq/L <br /> Date Analyzed .len 22, i 992 Jan 22, 1992 Jan 22, 1992 ,tan 22, 1 W2 <br /> OC Sample# BLK012292 BLK012292 BLK012292 BLK012292 <br /> Sample Conc.: 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 /> EMatrix Spike <br /> %Recovery: 92 93 94 97 <br /> EConc. Matrix <br /> grnite DUD.: 91 93 95 28 <br /> EMatrix Spike <br /> Duplicate <br /> %Recovery: 91 93 95 93 <br /> E <br /> Relative <br /> %Difference: 10 00 10 35 <br /> 6SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference cone of M S -Cone of M S o x 100 <br /> Mabe A Springer (Cone of M S + Cone of MSD)/2 <br /> Project Manager _ 2012775 EEE ca> <br /> E <br />