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n <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> . (916) 921-9600 • FAX (916) 921-0100 <br /> i <br /> RESNA Industries Client Project ID Arco #2130, Stockton <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick OC Sample Group 2010438,41,43 Reported Jan 27, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> r Lead <br /> Method EPA 7421 <br /> Analyst S Foster <br /> Reporting Units mg/kg <br /> Date Analyzed Jan 23, 1992 <br /> QC Sample # 112-0438 <br /> Sample Conc: 39 <br /> Spike Conc <br /> Added 125 <br /> Conc Matrix <br /> Spike 153 <br /> Matrix Spike <br /> % Recovery 91 <br /> Conc Matrix <br /> Spike Dup.: 157 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery- 94 <br /> Relative <br /> %Difference: 26 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Cone of M S D x 100 <br /> Michael R Giles (Conc of MS + Conc of M S D) 2 <br /> Laboratory Director 1120438 RES <2> <br />