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SEQUOIA ANALYTICAL _ <br /> 680 Chesapeake Drrve • Redwood City,CA 94063 ., <br /> (415) 364-9600 • FAX(415) 364-9233 <br /> �~ ` fi"""b °"�O' ` <z <br /> 'RES Client Pralect!D W047513, Weber Point <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> jAttention. Tina LePage CC Sample Group- 20EI-3918 R rted: Aug 27, 1992'Y <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE thyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: M NPP M"PP M NPP M Hipp <br /> Reporting Units: Jrg/L pg/L ug/L yg/L <br /> Date Analyzed Aug 2S, t992 Aug 25, 1992 Aug 25, 1992 Aug 25, 1992 <br /> OC Sample#. GBLK082M GBLK082592 GBLK082592 GBLK082592 <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: 89 89 88 27 <br /> Matrix Spike <br /> % Recovery: 89 87 88 90 <br /> Conc. lr.atrix <br /> Spike Dup.: 96 9 7 95 29 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 96 97 95 97 <br /> Relative <br /> % Difference: 76 86 71 71 <br /> *SEQUOIA ANALYTICAL x Recovery Cone of M S --Conc of Sample x too <br /> Spike Conc Added <br /> A Relative%Dtiference Ccnc of M S -Conc of M S D X100 <br /> ee (Conc of M + ronc of M S D)/2 <br /> roject Manager 2083918 WAr <2> <br />