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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> ;Waterwork r Client Project ID W0475,Weber Point <br /> "1710 Main Street <br /> v Escalon, CA 95320 <br /> t ,Attention Tina LePage OC Sample Group 2041065-6v r v 4,Hr.v, l N„ F Reported Apr 13, 1992 <br /> o-r r?,i .4t„ ...w nR rw-aW,ai }rsrr.w r.}rr r r.vr r r ex .Y r! aTn,^..,.,e V.r h t si ti r a t r Y!�"! ,,..r.vw rr r r.s r r.�✓,fit^•�.AL.%,.wc.•a+a" .,,w�+.x•=%. <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 Nipp M Nipp M Nipp M Nipp <br /> Reporting Units ug/L pg/L Ng/L yg/L <br /> ' Date Analyzed Apr 8, 1992 Apr 8, 1992 Apr 8, 1992 Apr 8, 1992 <br /> OC Sample#`r GBLK040892 GSLK040892 GBLK040892 GBLK040892 <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 Matrix <br /> Spike: 97 10 98 30 <br /> ' Matrix Spike <br /> % Recovery: 97 100 98 100 <br /> Conc Matrix <br /> Spike Dup.: 10 10 10 30 <br /> ' Matrix Spike <br /> Duplicate <br /> % Recovery: 100 100 100 100 <br /> Relative <br /> ' % Difference 30 00 20 00 <br /> SEQUOIA ANALYTICAL % Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> � Relative%Difference Conc of M S -Cone of MSD x 100 <br /> la (Conc of M S + Conc of M S D)L2 <br /> 6Jectct Manager 2041065 WAT <3? <br />