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SEQUOIA LTI �L <br /> 680 ChesapeaKe <br /> Drive yFAX 4415)364 9233CA 9 <br /> 4063 <br /> 600 <br /> (415)364 9 <br /> U.S.Technical Environmental Consult, Client Project 1D: #90054.03 <br /> .1414 N.Broadway Rd. <br /> i --, 'Tempe,AZ 65282 Reported Dec 10, 1991 <br /> Attention: Rowiand Hall <br /> QC Sample Group 1114514 16,i .... ,:. . <br /> QUALITY CONTROL DATA REPORT <br /> Ethyl- <br /> ANALYTE Toluene Benzene X eves <br /> Benzene <br /> tEPA 8020 EPA 8020 <br /> Method: EPA 6020 EPA 8020 <br /> 4 i <br /> A.Maralit A.Maralit A.Maralit <br /> Analyst: AMarallt <br /> Reporting Units: Na/L Yg/L N9/L ug/L <br /> Date Analyzed: Dec 4, 1991 Dec 4, 1991 Dec 4, 1991 Dec a, 19g1 <br /> QC Sample#: GBLK1204g1 GBLKIW491 GBLK120491 GBLK120491 <br /> i <br /> l <br /> N.D. <br /> N.D. N.D. <br /> It N.D. <br /> .,i <br /> , <br /> �i Spike Cone. 10 10 30 <br /> Added: t0 <br /> Cone.Matrix 9.9 10 10 30 <br /> w Spike: <br /> Matrix Spike 100 100 100 <br /> °k Recovery: 99 <br /> Conc.Matrix 9.9 10 3.0 <br /> Spike Dup.: 9.7 <br /> Matrix Spike <br /> Duplicate99 100 100 <br /> %Recovery: 97 <br /> Relative 1.0 0.0 0.0 <br /> %Difference: 2 0 <br /> f <br /> ? %Fiecova <br /> Conc.of M.S.-Cgnc.of Sample x 104 <br /> f SEQUOiA ANALYTICAL. �'' Spike Cvne,:;ddea <br /> !alive%Ditlerence: Conc.v1 M -Conc.vt M.S.D. x tOD <br /> Maiie A.Springer } Kona.of M.F.s. Canc.of M.S.D.i 1 Z 1114814.1157 <s> <br /> Project Manager <br />