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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> OWaterwork Client Project ID. 475,Weber Point <br /> 1710 AAain Street `` <br /> Escalon,GA 95320 j <br /> Atterrt�on Tina LePage CC Sam�ie Grouj���204-3707 .�+ p/qp Reported: 27, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: M Mpp M.Nipp M Hipp M Hipp <br /> Reporting Units: pg/L P9/L F9/L P9/L <br /> Date Analyzed Apr 22, 1992 Apr 22, 1992 Apr 22, 1992 Apr 22, 1992 <br /> QC Sample#- GBLK04zm GSLK042292 GBLK042292 GBLK042292 <br /> Sample Conc.: N D N.D N D N D <br /> Spike Conc. <br /> Added: 10 10 10 30 <br /> Conc. Matriu <br /> Spike: 92 92 92 28 <br /> Matrix Spike <br /> %Recovery: 92 92 92 93 <br /> Conc. Matrix <br /> Spike Dup.: 9.1 90 92 27 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery- 91 90 92 90 <br /> Relative <br /> %Difference: 1 1 2-2 00 36 <br /> SEQUOIA ANALYTICAL %Recovery: Conc of M S -Conc of Semple X100 <br /> Spike Conc Added <br /> }a Relative%Difference Conc of M S.-Conc of M&D n 100 <br /> Lee Conc of M S + Conc of M.S,0 2 <br /> rolect Manager 2043707 WAT t2> <br />