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` SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RI=SNA Industries Client Project ID Arco#6100, Tracy <br /> 3164 Gold Camp Dr. Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek QC Sample Group 2120464-65 Reported Dec 15, 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 Chiaravalloti Chiaravailoti Chiaravallota Chiaravalloti <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Dec 15 1992 Dec 15, 1992 Dec 15, 1992 Dec 15, 1992 <br /> OC Sample# BLK121592 BLK121592 BLK121592 BLK121592 <br /> Sample Conc. N D N D N D N D <br /> Spike Conc. <br /> Added: 020 020 020 040 <br /> Conc. Matrix <br /> Spike: 017 018 018 034 <br /> Matrix Spike <br /> % Recovery- 85 90 90 85 <br /> Conc. Matrix <br /> Spike Dup.: 018 018 018 035 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 90 90 90 88 <br />' Relative <br /> % Difference: 57 00 00 29 <br /> Duaiity 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 /> W)ZE� �~ Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of MSD x 100 <br /> Michael R Giles (Cone cf M S + Conc of M SD)/2 <br /> Laboratory Director <br /> r <br /> 2120473 AES a2> <br />