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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921 0100 <br /> i . w v� YNry <br /> EMCON Associates piens Project ID She i 820v weer Charter way,stoaaon <br /> 1433 N Market Blvd <br /> Sacramento, CA 95834 <br /> Attention Sheila Kruse CC Sample Group 2050012-18 Reported May 18, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi- <br /> Benzene Toluene Benzene Xylene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed May 14, 1992 May 14 1992 May 14 1992 May 14, 1992 <br />' OC Sample# 20500758 20500758 205500756 20500758 <br /> Sample Conc N D N D N D N D <br /> I <br /> Spike Conc. <br /> Added. 001 001 001 002 <br /> Conc. Matrix <br /> Spine- 00093 00089 00097 0.019 <br /> Matrix Spike <br /> % Recovery, 93 89 97 95 <br />' Conc. Matrix <br /> Spike Dup.: 00094 00091 001 0 019 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery* 94 91 100 95 <br /> Relative <br /> % Difference 1 1 22 30 00 <br /> SEQUOIA ANALYTI L %Faecovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br />' Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc cf M S D) 2 <br /> Laboratory Director <br /> 2050012 EMC c5> <br /> 1 <br />