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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415)364-9600 • FAX(415)364.9233 <br /> ` ChevoStocktjectl on W -- CPo3I� <br /> 1710 Main Streets <br /> a+ !Sst.alon,CA 95320 y <br /> °�Atterltion Tina LePage CC Sample Grou 1063516.3518 Re oi'ted Jul 8, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Yong* <br /> w• <br /> Method EPA SM EPA 8020 EPA 8020 EPAWW <br /> Analyst. a Meyer G.Mteyer G Meyer G Meyer <br /> Reporting Units. 09 no n9 n9 <br /> Date Analyzed Jul 1. 1991 ,nil 1. 1991 Jul 1, 1991 Jul 1. 1991 <br /> ` OC Sample# GBLK 070191 GELK 070191 GBL(070191 GBLK 070191 <br /> Sample Conc.• ND ND NO ND <br /> iSpike Cont. <br /> Added 100 100 100 300 <br /> Fes+ <br /> Cone Matrix <br /> Spike 100 100 100 300 <br /> { F <br /> Matrix Spike <br /> %Recovery 100 100 100 100 <br /> � F <br /> "* Cone Matrix <br /> Spike Dup: 100 100 100 300 <br /> Matrix Spike <br /> Duplicate <br /> i, %Recovery 100 100 100 100 <br /> Relative <br /> 1 ° %Difference. 00 00 00 00 <br /> m <br /> I <br /> SEQUOIA ANALYTICAL %Recovery Cone of M 8 - c of ple X 100 <br /> F Spsne Cone Added <br /> Relative%Ddference Cone of M S Cone 01 M S 0 x 100 <br /> a eth C ( nc of M +Cone of M 1 2 <br /> j P oject Manager 10W516 WAT e2> <br /> i <br />