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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> i <br /> RESNA Industries Client Project 1D Arco #6100, Tracy <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek QC Sample Group 2120705-06 Reported Dec 30, 1992 <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> i Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 8620 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravallob Chiaravalloti <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> I Date Analyzed Dec 29, 1992 Dec 29, 1992 Dec 29, 1992 Dec 29, 1992 <br /> QC Sample# BLK122992 BLK122992 BLKIM92 8LK122992 <br /> Sample Cone . N D N D N D N D <br /> Spike Cone <br /> Added: 020 020 020 040 <br /> k <br /> Cone. Matrix <br /> Spike: 019 019 019 040 <br /> r <br /> Matrix Spike <br /> % Recovery. 95 95 95 100 <br /> Cork. Matrix <br /> I Spike Dup. 018 019 019 038 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 90 95 95 95 <br /> 1 <br /> Relative <br /> % Difference 54 00 00 51 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> I a, <br /> 6E101.10I1A ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> � �J Spike Conc Added <br /> f Relative%Difference Conc of M S -Conc of M S D x 160 <br /> Michael R Giles (Cont of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> b 2120705 RES <2> <br /> z S-b{ <br />