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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drne • Redwood City,CA 94063 <br /> (415)364-9600 FAX(415)364-9233 <br /> s yf. <br /> 9',�RESNA Client Project ID W0475,Weber Point <br /> } <br /> 11710 Main Street <br /> a Erscalon, CA 95320 r <br /> 'Attention Tina Le Page OCSamVe Group 2050926-7 Reported: May 8. 19M <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyf- <br /> Benzene Toluene benzene 2 enes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. L Laikhtman L Lwkhtman L Lwkhtman L L.aikhbman <br /> Reporting Units: ug/L pg/L pg/L PDX <br /> Date Analyzed: May 7, 1992 May 7. 1992 May 7, 19x2 May 7, 1992 <br /> OC Sample#. sIJ(050 s2 BLK0500792 BLK050792 s>x050792 <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: 98 98 98 30 <br /> Matrix Spike <br /> %Recovery: 98 98 98 100 <br /> Conc. Matrix <br /> Spike Dup.: 10 10 97 30 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 100 97 100 <br /> Relative <br /> % Difference: 20 2.0 10 00 <br /> SEQUOIA ANALT171CAL %Recovery Conc of M S -Conc of Sample u 100 <br /> Spike Cone.Added <br /> Reiatrve%Difference C.onc of M S -Cone of M S.D X 100 <br /> a Conc of M S + Conc of M S.D 2 <br /> aJect Manager 205092&WAT <3> <br />