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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 9 FAX (916) 921 0100 <br /> EMCON Associates Client Project ID Shell, 6131 Pacific Ave, Stockton <br /> 1433 N Market Blvd <br /> Sacramento, CA 95834 <br /> Attention Jim Prttllla OC Sample Group 2100415-18 Reported Oct 28, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes ` <br /> Method EPA 602 EPA 602 EPA 602 EPA 502 <br /> Analyst Ch+aravallob chiWaewallob Chiaravadlob Chiaravailob <br /> Reporting Units ug/L lig/L Ng/L pg/L <br /> Date Analyzed Oct 23 1992 Oct 23 1992 Oct 23 1992 Oct 23 1992 <br /> QC Sample# 216-0417 210-0417 210-0417 210-0417 <br /> Sample Cone.. N D N D N D N D <br /> Spike Cone. <br /> Added: 10 10 10 20 <br /> Cone. Matrix <br /> Spike 83 88 86 16 <br /> Matrix Spike <br /> % Recovery 83 88 86 8o <br /> Cone Matrix <br /> Spike Dup : 86 90 90 17 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery, 86 90 90 85 <br /> ngsinflye <br /> %Difference, 36 22 45 61 <br /> SEQUOIA ANALYTICAL % Fleoavery Conc of M S -Conc of Sample x 100 <br /> /�/JAZ- /, Spike Conc Added <br /> 'LJG,(!/�!/ !/// Aeiawe%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles (Cont of M S + Conc of M S D) 2 <br /> Laboratory Director <br /> 2100415 EMC <3> <br />