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SEQUOIA ANALYTICAL <br /> 680 Chesaoeake Drive - Redwood Cty, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> ".'QH Materials I lilt <br /> COrporatlon lent P <br /> i0a Sheldon 0 / 10387 <br /> 1425 N.W. Market Blvd., Suite 9 <br /> iSacrarnento. CA 96&U <br /> "Attention: Vince Rose <br /> CC m e Group: RiW1 19 <br /> ........... Reported: May 3. 1991 <br /> QUALITY CONTROL DATXREPORT <br /> ANALYTE <br /> aesel Benzene Toluene Benzene Xylenes <br /> Method: EPA 8015 EPA 8= EPA e= EPA 8= EPA SM <br /> Analyst: R.L" K Nguyen M.Nguyen K Nguyen K Nguyen <br /> Reporting Units: ng <br /> ng Ag ng ng. <br /> Date Analyzed: may i. 1991 May 2, 1991 may Z 1991 may Z 1991 may Z 1991 <br /> QC Sample#: oBLK=191 GBLK 050291 GBLK 050291 GBL K 050291 GBLX 05=1 F <br /> J <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Cone. <br /> Added: 900 100 100 1003W <br /> ;j <br /> Conc. Matrix <br /> Spike: 690 100 100 100 310 <br /> Matrix Spike <br /> % Recovery: 77 100 100 100 100 <br /> Conc. Matrix <br /> Spike Dup.: 680 99 100 100 300 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 76 99 100 1 DO 100 <br /> Relative <br /> % Difference: 1.5 1.0 0.0 0.0 3.3 <br /> SEQUOIA ANALYTICAL %Pecotery: Conc-of M.S.--Czwt--of SaMD10 X 100 <br /> e, + .''f/ ` +�^ Wks C4rv-- Added <br /> Retathm%Diftwenow: Cone.of&m-cow-of w&v. <br /> X 100 <br /> Eftialieffi W. Hack! <br /> ProjeM Manager (Conc-of kt$.+ Com of A&&D.) 2 <br /> F11043119-CCO <3> <br />