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SEQUOIA ANALYTICAL <br /> 680 pea a Orive a Redwood City,CA 94063 <br /> (415)364 9640 • FAX(415)364-9233 <br /> 4 <br /> Waterwo Rent rojeat D 376, evron on <br /> 1710 Main Street <br /> Escalon,CA 95320 <br /> Attention Tina LePa a QC Sample Group 1050430.0432 Reported May 20, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> .,, lXpvl <br /> Method EPAW15 <br /> Analyst J maierat in <br /> Reporting Units mg/kg <br /> Date Analyzed Mey 9, 1gg1 <br /> QC Sample etxosoe9I <br /> Sample Cone. N D <br /> " — Spike Con.. <br /> Added 10 <br /> Cone.Matrix <br /> Spike 71 <br /> Matra Spike <br /> %Recovery. 71 <br /> Cone Matrix <br /> Spike Dup• 66 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery' 66 <br /> Relative <br /> %Difference 73 <br /> S,EqUOIA ANALYTIC L % com of M.S.-CRE of ae x 100 <br /> Spike Com Added <br /> / Relad"%Dlffmonce Cone.of M.S.-Cono of R&D x 100 <br /> th a a M T+ of M S_D R 2 <br /> roject Manager 1os0430.wAT T4s <br />