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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 - FAX (415) 364-9233 <br /> Waterwork Client Project ID W0475,Weber Point <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> ' 'Attention Tina Le Page QC Sample Group 2042426-7 Reported Apr 17, 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 L Laikhtman L.La,khtman L Laikhtman L. Laikhtman <br /> Reporting Units ug/L pq/L ug/L ug/L <br /> Date Analyzed Apr 15, 1992 Apr 15, 1992 Apr 15, 1992 Apr 15 1992 <br /> QC Sample # GBLK041592 GBLK041592 GBLK041592 GBLK041592 <br /> rSample Cone - N D N D N D N D <br /> Spike Cone. <br /> Added 10 10 10 30 <br /> ' <br /> Cone Matrix <br /> Spike 94 96 95 29 <br /> ' Matrix Spike <br /> %Recovery 94 96 95 97 <br /> Cone Matrix <br /> Spike Dup : 91 93 91 27 <br /> ' Matrix Spike <br /> Duplicate <br /> % Recovery 91 93 91 90 <br /> Relative <br /> ' % Difference 32 32 43 71 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> a0 Relative%Cifference Cone of M S -Cone of M S 0 z 100 <br /> L Yr" (Cone of M S + Conc of M S D) 2 <br /> ' P oject Manager 2042426 WAT <3> <br />