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amWE, <br /> SEQUOIAChesapeake Irl RedwoodANALYTICAL <br /> 680 Che p <br /> CA 94063 <br /> (415)364-9600 FAX(415)364-9233 <br /> Exceltech Client Project ID: 34913231,Quik Stap#132 <br /> .41674 Christy Street Dec 4 1990. <br /> iFremont,CA 94538 Reported: <br /> Attention: Jim Rubin <br /> QC Sample Group 011.3986 <br /> QUALITY CONTROL DATA REPORT <br /> Ethyl Lead Lead <br /> ANALYTE Toluene Benzene Xylenes LC STLC <br /> Benzene <br /> Method: EPA 8020 <br /> EPA 8020 EPA 8020 EPA 8020 EPA 7421 EPA 7421 <br /> G Meyer G.Meyer G.Meyer R.Eastman R.Eastman <br /> Analyst: G.Mayer ng/kg ng/kg mg/kg mg.- <br /> Reporting Units: ng/kg ng/kg <br /> Date Analyzed: Dec 3, 1990 Dec 3, 1990 Dec 3, 1990 Dec 3, 1990 Dec 3, 1390 Dec 4, 1y90 <br /> QC Sample#: G0113814 G0113814 Go113814 G0113814 o11.3408 011-3534 <br /> N.D. <br /> N.D. N.D. 5.3 N.L. <br /> Sample Conc.: N.D. <br /> Spike Cone. 100 300 50 1.0 <br /> Added: 100 100 <br /> Conc.Matrix 100 230 48 1.1 <br /> Spike: 95 95 <br /> Matrix Spike 100 100 85 110 <br /> %Recovery: 95 <br /> 95 <br /> Conc.Matrix 108 328 56 1.0 <br /> Spike Dup.: 100 100 <br /> Matrix Spike 100 <br /> Duplicate 100 100 108 109 101 <br /> %Recovery: <br /> Relativa 7.7 8.9 15 9.5 <br /> %Difference: 5.1 5.1 <br /> Cone.o}M.S.-Conc.of Sample x 100 <br /> SEQUOIA ANALYTICAL 96 Recovery. Spike Cane.Added <br /> Relative%Difference: Cone.of M.S.-Conc.of M.S.D. <br /> x1� <br /> (Conc.of M.S.4 Cane.of M.S.D.}/2 113986.Ef3S <3> <br /> :kie lag <br /> Project Ma ger <br />