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j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 FAX (916) 921-0100 <br /> { ` ' \��\�♦ <br /> B &7,aldwell Client Project 1D Ar`c0 #2133, Stockton <br /> 7 St <br /> Sacramento, CA 95814 <br /> Attention Mindy Wright QC Sample Group 301-0611 Reported Feb 3, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Eth lbenzene xytenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravaliob Chiaravalloti Chlaravailoti Chiaravailob <br /> Reporting Units ug/L ug/L ug/L ug/L <br /> Date Analyzed Feb 2, 1993 Feb 2, 1993 Feb 2, 1993 Feb 2, 1993 <br /> OC Sample * BLK020293 BLK020293 BLK020293 BLK020293 <br /> Sample Conc. N D N D N D N D <br /> Spike Conc. <br /> Added: 10 10 10 20 <br /> 0 <br /> Conc. Matrix <br /> Spike: 87 91 89 17 <br /> Matrix Spike <br /> % Recovery: 87 91 89 85 <br /> Conc. Matrix <br /> Spike Dup.: 92 <br /> 9 9 9 6 18 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery. 92 99 96 90 <br /> Relative <br /> % Difference. 56 84 76 57 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Reoovery Conc of M S -Conc of Sample x 100 <br /> R 9"&WSpike Conc Added <br /> Relative%Difference Conc of M S -Conc of WS D x 100 <br /> Michael R Glles (Conc of M S + Conc of M.S D)/2 <br /> Laboratory Director 3010611 BRS `x' <br />