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t <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive Redwood City,CA 94063 <br /> Nor (415)364-9600 • FAX(415) 364-9233 <br /> RESNA Ghent Project ID: W0475,Weber Point <br /> 1710 Main Street <br /> Es on, CA 95320 <br /> Attention: Tina Le Page OC Sample Group: 205-2819 Reported <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- --71 <br /> Benzene Toluene benzene Xylenes <br /> Method: EPA 8020 EPA 8x20 EPA 8020 EPA 8020 <br /> AnalySt. M Mpp M.MpP M Mpp M Mpp <br /> Reporting Units. lig/L pg/L Pg/L ug/L <br /> Date Analyzed' May 19, 1992 May 19, 1992 May 19, 1992 May 19, 1992 <br /> OC Sample# GBL K051992 GBLK0551992 GBLK051992 GBLK051992 <br /> MS/MSD MS/MSD MS/MSD MS/MSD <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: 94 93 93 28 <br /> Matrix Spike <br /> % Recovery: 94 93 93 93 <br /> Conc. Matrix <br /> Spike Dup.: 10 10 9.9 30 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 100 99 100 <br /> Relative <br /> %Difference: 62 7.3 62 69 <br /> SEQUOIA ANALYTICAL %pacovery Cone of M S -Conc of Sample X 100 <br /> Spike Conc.Added <br /> Relative%Dffefence Conc of M S -Conc of M S D X 100 <br /> • ria LAA (Conc of M S + Conc of M S D) 2 <br /> roject Manager 2052819 WAT c2> <br />