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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive a Redwood City,CA 94053 <br /> (415)364-9600 - FAX(415)364-9233 <br /> atervvo ierlt ro ect 376, hevron, tockton <br /> 1710 Main Street <br /> Escalon,CA 95320 <br /> Attention. Tina LePage CC Sam Group 1051338-1340 Reported May 20, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE E1nyl- <br /> SOn2aM Toluene benzene nae <br /> EPA EPA EPA EPA <br /> Method sols/ww 8015/802D 8o1s/s= sola/em <br /> Analyst S.Hoffmann S.Hoffmann S Hotrmann &Hoffmann <br /> Reporting Units no no no no <br /> Date Analyzed May 13, 1491 May 13, 1991 May 13, 1991 May 13. 1991 <br /> QC Sample# GRX051391 GBLK051391 GELK061391 GSLK051391 <br /> Sample Conc.; N D N D N D N D <br /> . Spike Cone <br /> Added 100 100 100 300 <br /> Conc Matrix <br /> Spike 100 100 100 310 <br /> Matrix Spike <br /> %Recovery: 100 100 100 100 <br /> Co.— Matrix <br /> Spike Dup 100 100 100 320 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery* 100 100 1 DO 110 <br /> Relative <br /> %Difference. 00 00 00 32 <br /> SE lA ANALYTICAL %Aeeowry' Cone of M -Cone of Sample x 100 <br /> ' Spiky Cane Added <br /> Palall"%Dlffomnee Come of M S Cone of M S D X 100 <br /> g4a nc of M S +Me of 0 2 <br /> 4ro4jectanager 1051198 WAT <3> <br />