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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> • <br /> RESNA lndustnes 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 2120473-74 Reported Dec 30, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethyibenzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravalloti Chiaravallou Chiaravailott Chiaravallob <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 /> QC Sample # BLK121592 BLK121592 BLK121592 BLK121592 <br /> Sample Cone : N D N D N D N D <br /> I . Spike Cone. <br /> Added- 020 020 020 040 <br /> Cone. Matrix <br /> Spike- 017 018 018 034 <br /> I <br /> Matrix Spike <br /> % Recovery: 85 90 90 85 <br /> Cone. Matrix <br /> I Spike Dup.. 018 018 018 035 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 90 90 90 88 <br /> Relative <br /> % Difference- 57 0 0 00 29 <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 /> � //�a �j/J 1� Spike Conc Added <br /> �L/���/` Relative%Difference Conc of IVIS -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 /> A2120473 RES <2 <br />