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1� <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City. CA 94063 <br /> AW (415) 364-9600 FAX(415)364-9233 <br /> RESIVA <br /> Client Project ID W047513.Weber Pt. <br /> �1710 Main Street <br /> ESCalonCA 95320 ,� <br /> LA� <br /> ention Gr Stahl QC Sam a Graup 2110174 Re vied: Nov 4, 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 M Mpp M MPP M MPP M MPP <br /> Reporting Units P9/L p9/L N9/L f+9/L <br /> Date Analyzed Nov 3, 1992 Nov 3, 1992 Nov 3, 1992 Nov 3, 1992 <br /> QC Sample#: GBLK110392 GBLKI10392 GBLK110392 GBLK110392 <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> Sample Cone.: N D N D N D N D <br /> Spike Cone. <br /> Added: 10 10 10 30 <br /> Cone. Matrix <br /> Spike: 99 98 98 30 <br /> Matrix Spike <br /> %Recovery: 99 98 98 100 <br /> Cone. Matrix <br /> Spike Dup.: 10 9.9 10 30 = <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 99 100 100 <br /> Relative <br /> %Difference: 10 10 2.0 00 <br /> �EQUOIA ANALYi`ICAL %Recovery Cone.of M.S.-Conc.of Sample X 100 <br /> Spike Gone,Added <br /> (0Relative%Difference Cana of M S.-Cori of M.S.D. X 100 <br /> (Cont of KS + Conc of KS D) 2 <br /> (FroJect Manager 2110174 WAY <2> <br />