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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (9167 921-0100 <br /> (� -• Y . w t \h s ,o-.,[A �v`� . a}.} ,. .r � Yd�I'^'sar�'i x M1� <br /> EMCON Associates u Client Project ID Shell, 420 W Kettiernan Lane, Lodi <br /> 1433 N Market Blvd <br /> Sacramento, CA 95834 <br /> Attention Sheila R"els OC Sample Group 2070253-57 Reported Jul 21, 19M <br /> QUALITY CONTROL DATA REPORT <br /> M1V1L l C �tt1y1- <br /> I Benzene Tokmw Befix e <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 90Zd <br /> Analyst C Chapman C Chapman C Chapman a Chapman <br /> Reporting Units ppb ppb ppb ppb <br /> Date Analyzed Jul 2o, 1992 Jul 20, 1992 Jul 20, 1992 Jul 20. 1992 <br /> OC Sample# 207-0283 207-02W 2074253 207.0253 <br /> Sample Conc.: N D N D N D N D <br /> Spike Cont. <br /> Added: 10 10 10 20 <br /> Conc. Matrix <br /> Spike, 88 92 90 17 <br /> Matrix Spike <br /> %Recovery: 88 92 90 85 <br /> Conc. Matrix <br /> Spike Dup.: 99 10 10 19 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 99 100 100 95 <br /> Relative <br /> % Difference: 12 83 10 11 <br /> SEQUOIA ANALYTICAL %Recover,, Conc of M.S.-Conc.of Sample x 100 <br /> Spike Conc Added <br /> Relative 96 Drfference Conc of M S.-Conc of M S t) x 100 <br /> Michael R Giles (Cont of M S +Cone.of M S D) 2 <br /> Laboratory Director <br /> 2070253 EMC <2> <br />