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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 #760, Lodi <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek QC Sample Group 207-0602 Reported Aug 12, 1992 <br /> w <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> I Chromium Lead Cadmium <br /> Method EPA 6010 EPA 6010 EPA 6010 <br /> Analyst S Foster S Foster S Foster <br /> Reporting Units mg/kg mg/kg mg/kg <br /> Date Analyzed Aug 10, 1992 Aug 10, 1992 Aug 10, 1992 <br /> QC Sample# 207-0602 207-0602 207-0602 <br /> Sample Conc: 95 10 N D <br /> Spike Conic <br /> Added 50 50 50 <br /> Conc Matrix <br /> Spike 55 57 47 <br /> 1 <br /> Matrix Spike <br /> %Recovery 91 94 94 <br /> 1 Conc. Matrix <br /> Spike Dup 53 55 45 <br /> Matrix Spike <br /> Duplicate _ <br /> % Recovery 87 90 90 <br /> 1 <br /> Relative <br /> %Difference. 37 36 43 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> 1 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample x 100 <br /> �• Spike Conc Added <br /> T` -' Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D)/2 <br />' Laboratory Director <br /> 2070600 RES <br />