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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 /> Brown &Caldwell Client Project ID Arco #2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Misner QC Sample Groupv212-0521 Reported Dec 30, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravallob chiaravalroti Chlaravailoti Chiaravalloti <br /> Reporting Units ufa/L u9/L u9/L ug/L <br /> Date Analyzed Dec 18, 1992 Dec 1e, 1992 Dec 18, 1992 Dec 18, 1992 <br /> QC Sample # BLK121892 BLK121892 BLK121892 BLK121892 <br /> Sample Cone.: N D N D N D N D <br /> Spike Cone. <br /> Added: 10 10 10 20 <br /> Cone. Matrix <br /> Spike: 89 89 90 17 <br /> Matrix Spike <br /> %Recovery: 89 89 90 85 <br /> Cone Matrix <br /> Spike Dup.. 91 94 93 18 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery- 91 94 93 90 <br /> Relative <br /> %Difference. 22 55 33 57 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x loo <br /> Spike Conc Added <br /> Relative%Difference Cone of M S -Cone of MSD x 100 <br /> Michael R Giles (Conc of M S + Conc of MSD)/2 <br /> Laboratory Director <br /> 2120521 BRS <3> <br />