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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921-9600 FAX (916) 921-0100 <br /> RESNA Industnes x Client Project ID #30003-8,Arco,7906 N EI Dorado,Stockton v x <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Matthew Taylor OC Sample Group 2100306-12 deported Oct 19, 1992 <br /> Y <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 6022 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravalloti Chiaravallolr <br /> Reporting Units yg/L Ng/L N9/L ug/L <br /> Date Analyzed Oct 16, 1992 Oct 16, 1992 Oct 16, 1992 Oct 16, 1992 <br /> OC Sample # BLK101692 BLK101692 BLK101692 BLK101692 <br /> Sample Conc.: N D N D N D N D <br /> Spike Conc. <br /> Added. 10 10 10 20 <br /> Conc.Matrix <br /> Spike: 83 86 83 16 <br /> Matrix Spike <br /> % Recovery 83 86 83 80 <br /> Conc Matrix <br /> Spike Dup 88 92 91 17 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery, 88 92 91 85 <br /> Relative <br /> % Difference 58 67 92 61 <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 100 <br /> Spike Conc Added <br /> Relabve%Difference Conc of M S -Conc of M S D X100 <br /> Michael R Giles (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 2100306 RES <4> <br />