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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX {916} 9210100 <br /> RESNA Industries Client Project ID Arco #2130, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson QC Sample Group 2110492-97 Reported Dec 1, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravallott Chiaravalioti Chiaravaliob Chiaravalloti <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Nov 24, 1992 Nov 24, 1992 Nov 24, 1992 Nov 24, 1992 <br /> OC Sample# 211-0351 211-0351 211-0351 211-0351 <br /> i <br /> Sample Cone . N D N D N D N D <br /> Spike Cone <br /> Added 020 020 020 040 <br /> Cone. Matrix <br /> Spike: 016 017 017 034 <br /> Matrix Spike <br /> %Recovery 80 85 85 85 <br /> Cone Matrix <br /> Spike Dup . 017 018 018 030 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery* 85 90 90 93 <br /> Relative <br /> %Difference 61 5 7 57 85 <br /> i <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> OSEQUOIA ANALYTIC %Recovery Conc of M S -Conc of Sample x 100 <br /> r r Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles {Conc of M S + Conc of M S D]/2 <br /> Laboratory Director <br /> 2110492 RES <2> <br />