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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 Industries V Client Project ID Arco#2130, Stockton n Y <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Altiman QC Sample Group 2120116-17 Reported Dec 15, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> i <br /> i <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravalloti Chiaravalloti Ch,aravalioti Chiaravalioti <br /> Reporting Units pg/L u9/u us/u u9/L <br /> Date Analyzed Dec 9, 1992 Dec 9, 1992 Dec 9, 1992 Dec 9, 1992 <br /> QC Sample # 212-0083 212-0083 212-0083 212.0083 <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: 90 92 94 19 <br /> Matrix Spike <br /> %Recovery. 90 92 94 95 <br /> Cone Matrix <br /> Spike Dup : 93 96 97 20 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 93 96 97 100 <br /> Relative <br /> % Difference: 33 43 3 1 51 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample X100 <br /> Spike Conc Added <br /> Relative%Difference Cone of M S -Conc of MSD X100 <br /> Michael R Giles (Cone of M S t Conc of M S D) 2 <br /> Laboratory Director <br /> 2120116 RES <3> <br />