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SEQUOIA ANALYTICAL <br /> ' 819 Striker Avenue, Suite 8 e Sacramento, CA 95834 <br /> (916) 921-9600 FAX (916) 921-0100 <br /> EMCON Associates v Cllent Project iD Shell,7910 Lower Sacto Rd,Stockton <br /> 1433 N Market Blvd <br /> Sacramento,CA 95834 <br /> Attention Sheila Kruse QC Sample Group 206-0043 Reported Jun 12, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> i <br /> Method EPA 8020 EPA 8020 EPA$020 EPA 8020 <br /> Arialyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm Ppm <br /> Date Analyzed Jun 11, 1992 Jun 11, 1992 Jun 11, 1992 Jun 11, 1992 <br /> CC Sample# 2060121B 20601218 20601218 20601218 <br /> Sample Cone.: N D N D N D N D <br /> Spike Cone. <br /> Added: 0 010 0 010 0 010 0 020 <br /> 1 Cone.Matrix <br /> Spike 00093 0 010 00098 0 020 <br /> i Matm Spike <br /> %Recovery: 93 100 98 100 <br /> Conc. Matrix <br /> Spike Dup.: 00093 0 010 00097 0 020 <br /> Matrix Spike - <br /> Duplicate <br /> %Recovery: 93 100 97 100 <br /> 1 Relative <br /> %Difference. 00 0 0 10 00 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> L" 4 Relative%Difference Conc of M S -Conc of M S D X100 <br /> ' Michael R Giles (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 2060043 EMC <2> <br />