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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> RESNA Client Project ID 38032-7, Unocal #6981 <br /> 42501 Albrae Street, Suite 100 <br /> Fremont, CA 94538 <br /> Attention Anthony Eneno OC Sample Group 2031218-19 Reported Mar 12, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead Organic Lead <br /> Method EPA 7421 L3F7 <br /> Analyst S Chin S Chin <br /> Reporting Units mg/kg mg/kg <br /> Date Analyzed Mar 10, 1992 Mar 10, 1992 <br /> QC Sample# 203.1232 203-1401 <br /> I <br /> Sample Conc N D NO <br /> Spike Conc. <br /> Added 50 060 <br /> Conc Matrix <br /> Spike: 49 050 <br /> Matrix Spike <br /> % Recovery: 98 83 <br /> Conc. Matrix <br /> Spike Dup . 57 056 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 110 93 <br /> Relative <br /> %Difference 15 11 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> rr Spike Conc Added <br /> 1 Relative%Difference Conc of M S -Conc of MSC x 100 <br /> (Conc of M S + Conc of M S D) /2 <br /> Pf�ISCt Manager 2031218 ENS <3> <br /> J <br />