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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 indiistnes 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 2120633-38 Reported Dec 28, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethyibenzene Xylenes <br /> I <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravaltoti Chiaravalloti Chiaravailoti Chiaravalloti <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Dec 22, 1992 Dec 22, 1992 Dec 22 1992 Dec 22, 1992 <br /> QC Sample# BLK122292 BLK122292 BLK122292 BLK192292 <br /> Sample Cone N D N D N D N D <br /> • Spike Cone. <br /> i Added: 020 020 020 040 <br /> Cone Matrix <br /> Spike 019 020 020 037 <br /> I <br /> Matrix Spike <br /> % Recovery- 95 100 100 93 <br /> Cone Matrix <br /> i Spike Dup.: 019 019 020 037 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 95 95 100 93 <br /> i Relative <br /> % Difference- GO 51 00 00 <br /> Quality Assurance Statement All standard operating procedures and quairty control requirements have been met <br /> . SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> a 7 Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of MSD z 100 <br /> Michael R Giles (Cone of MS + Conc of M S D)/2 <br /> Laboratory Director <br /> 2120633 RES <2> <br />