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• <br /> ® SEQUOIA AN�ALYTI9CAL <br /> 680 Chesaeake Drive -p City, CA <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> RESNA Client Project ID 38012-10, Unocal <br /> 42501 Albrae Street, Suite 100 <br /> Fremont, CA 94538 <br /> Attention Anthony Enerio QC Sample Group 203-0430 Reported Mar 9, 1992 <br /> • <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE ' <br /> • Lead <br /> Method EPA 6010 <br /> Analyst M Mistry <br /> Reporting Units mg/kg <br /> • Date Analyzed Mar 6, 1992 <br /> QC Sample # 203-0430 <br /> Sample Conc 15 <br />• Spike Conc <br /> Added 50 <br /> Conc Matrix <br /> Spike 66 <br />• <br /> Matrix Spike <br /> % Recovery 102 <br /> Conc Matrix <br /> Spike Dup 65 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 100 <br />• <br /> Relative <br /> % Difference 15 <br />• <br /> . SEQUOIA ANALYTIC L %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> �} Relative%Difference Cone of M S Conc of M S 0 x 100 <br /> Zaia e (Conc of M S + Conc of M S D)/2 <br />• Manager 2030430 ENS <2> <br />