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'r <br /> j SEQUOIA ANALYTICAL <br /> 680 Chesapeake Dnve • Redwood City, CA 84063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> ;r <br /> RESNA Client Project ID- W0475,Weber Point <br /> 1710 Main Street <br /> 'Escalon, CA 95320 <br /> Attention Gr Stahl QC Sample Group. 210-0032 R ed: Oct 6, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Eth* <br /> Benzene Toluene benzene X nes <br /> Method. EPA 8020 EPA*= EPA 8020 EPA 8020 <br /> Analyst: R Gelder R Gelder FL Geckler R Gelder <br /> Reporting Units: IM/L. PDX yg/L pp/L <br /> Date Analyzed. ort 2, 19812 Oct 4 1992 Oct 2, 19912 Oct Z. 1992 <br /> QC Sample#: GBLK100292 GBLK100292 GBLK100292 GBLK100292 <br /> Sample Conc.: N.D. N.D. N D N D. <br /> Spike Conc. <br /> Added: 10 10 10 30 <br /> Conc.Matrin <br /> Spike: 19 10 11 32 <br /> Matrix Spike <br /> %Recovery: 110 100 110 107 <br /> Conc. Matrix <br /> Spike Dup.: 11 11 11 32 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 110 110 110 107 <br /> Relative <br /> %Difference: 00 9.5 00 00 <br /> EGIUOIA ANALYTICAL %Feecomyr Conc of M S -Conc.of Sample X 100 <br /> Spoke Conc.Added <br /> ejroePAga s%Difference Conn.of M S -Conc.of MAD. X 100 <br /> � I Coro,of M.S. +Cono.of M.S.D 2 <br /> c <br /> Manager 2100032.WAT �2� <br />