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I <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 a Sacramento CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> +�ro.4N. s <br /> RESNA Industries Client Project ID #30003-8,Arco,7906 N El Dorado,Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Matthew Taylor OC Sample Group 2100323-33 Reported Oct 22, 1992 <br /> QUAUTY CONTROL DATA REPORT <br />� ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chlaravailoti Chiaravaliou Chiaravallott Chiaravaiioti <br /> Reporting Units ue/i- ms/t- u9/u u9/u <br /> I Date Analyzed Oct 19, 1992 Oct 19, 1992 Oct 19 1992 Oct 19, 1992 <br /> QC Sample# 210-0200 210-0200 210-0200 210.0200 <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: 87 93 89 17 <br /> Matrix Spike <br /> %Recovery: 87 93 89 85 <br /> Conc.141atrm <br /> Spike Dup.: 90 96 92 18 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 90 96 92 90 <br /> Relative <br /> % Difference 34 32 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 100 <br /> Spike Conc Added <br /> !L//fff/rrr <br /> Michael R�R Relative%Difference Conc of M S -Conc of M S D X 100 <br /> Giles <br /> Laboratory Director (Conc of M S + Conc of M S D) 2 <br /> 2100323 RES <4> <br />