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F" SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> via— (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 OC Sample Group 2070611-12,19-20,22,24,26,28,50,61 Reported Aug 31, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Oil and Grease <br /> Method SM5520 <br /> Analyst N Valdes <br /> Reporting Units mg/kg <br /> Date Analyzed Aug 27, 1992 <br /> QC Sample # BLK082592 <br /> Sample Conc N D <br /> iSpike Cone <br /> Added 325 <br /> Cone Matrix <br /> Spike: 260 <br /> Matrix Spike <br /> % Recovery 80 <br /> Cone. Matrix <br /> Spike Dup 245 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery Y 75 <br /> Relative <br /> % Difference 60 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> I�LUZ'14'44 <br /> / Spike Conc Added <br /> Relative%Difference Conc of M S Conc of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M SD)/2 <br /> Laboratory Director <br /> 2070611 RES 42> <br />