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1 <br /> ` SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> ,RESNA Industries Client Project ID Arco #2076, Lodi <br /> '3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 1110697-702 Reported Nov 26, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 7421 <br /> Analyst C Chapman C Chapman C Chapman C Chapman S Foster <br /> Reporting Units ppm ppm ppm ppm mg/kg <br /> Date Analyzed Nov 25 1991 Nov 25, 1991 Nov 25, 1991 Nov 25, 1991 Nov 25, 1991 <br /> OC Sample# 111-0378 111-0378 111-0378 111-0378 111-0700 <br /> Sample Cone N D N D N D N D 23 <br /> Spike Cone <br /> Added 020 020 020 040 25 <br /> Conc Matrix <br /> Spike 020 019 019 040 45 <br /> Matrix Spike <br /> % Recovery 100 95 95 100 88 <br /> Conc Matrix <br /> Spike Dup 019 019 018 039 46 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 95 95 90 97 92 <br /> Relative <br /> % Difference 31 31 3 2 41 2 2 <br /> SEQUOIA ANALYTICAL %Recovery 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 /> Rick R DiMaio (Conc of M S t Conc of M S D)/2 <br /> Project Manager 1110697 RES <5, <br />