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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9066 FAX (510) 686-9689 <br /> v ERM-West(Sacramento) Client Project ID ERM-West Job No 653 10 <br /> v 2001 P Street, Suite 200 <br /> Sacramento, CA 95814 h <br /> Attention Shannon Sadler OC Sample Group 1110886-9 A}V Reported Dec 3, 1991 <br /> „� <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Diesel <br /> Method EPA 8020 EPA 8020 EPA 8015 <br /> Analyst M Nguyen M Nguyen A.Tuzon <br /> Reporting Units ug/L ug/L ug/L <br /> Date Analyzed Nov 27, 1991 Nov 27, 1991 Nov 26, 1991 <br /> OC Sample# BLKi12791 BLK112791 BLK111991 <br /> Sample Conc.: N D N D N D <br /> Spike Conc <br /> Added. 10 10 300 <br /> Conc. Matrix <br /> Spike: 11 10 270 <br /> Matrix Spike <br /> %Recovery: 110 100 89 <br /> Conc. Matrix <br /> Spike Dup.: 10 94 240 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery. 100 94 80 <br /> Relative <br /> %Difference: 95 62 12 <br /> Laboratory blank contained the following analytes None Detected <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br />.� Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Kenneth K F Lee Conc of MS + Conc cf M S Q 2 <br /> Laboratory Manager <br /> 1110886 ERS <3> <br />