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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 FAX (916) 921-0100 <br /> taney Geotechnical Client Project ID: #074-013, UPS - North Broadway <br /> 176 Industrial Blvd. <br /> West Sacramento, CA 95691 <br /> Attention: Mike Gereghty QC Sample Group: 2040085-90 Reported: Apr 20, .1992 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Oil&Grease <br /> Method: EPA 418.1 <br /> Analyst: Chiaravalioti <br /> Reporting Units: mg/kg <br /> Date Analyzed: Apr 20, 1992 <br /> QC Sample #: BLK042092 <br />' Sample Conc.: N.D. <br /> • Spike Conc. <br /> Added: 125 <br />' Conc. Matrix <br /> Spike: 112 <br /> Matrix Spike <br /> % Recovery: 90 <br /> ' Conc, Matrix <br /> Spike Dup.: 113 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 90 <br /> ' Relative <br /> % Difference: 0.89 <br /> SEQUOIA ANALYTICAL % Recovery: Conc.of M.S. -Conc.of Sampfe X 100 <br /> Spike Conc.Added <br /> Relative% Difference; Conc.of M.S.-Conc.of M.S.D. x 100 <br /> V <br /> Michael R. Giles (Conc.of M.S. + Conc.of M.S.D.) /2 <br /> Laboratory Director <br /> 2040085.RRR <2> <br />