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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 #2076, Lodi W A V M1LL <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson QC Sample Group 2100460-90 Reported Oct 28, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> i ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br />` Date Analyzed Oct 21, 1992 Oct 21, 1992 Oct 21, 1992 Oct 21, 1992 <br /> QC Sample# 210-0460 210-0460 210-0460 210-0460 <br /> Sample Conc : N D N D N D N D <br /> Spike Conc. <br /> Added: 0 20 020 020 040 <br /> Conc. Matrix <br /> Spike: 0 17 017 018 037 <br /> Matnx Spike <br /> % Recovery. 85 85 90 93 <br /> Conc. Matrix <br /> Spike Dup.. 017 017 018 037 <br /> Matnx Spike <br /> Duplicate <br /> % Recovery 85 85 90 93 <br /> Relative <br /> % Difference 00 00 00 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> 0 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D X100 <br /> Michael R Giles (Conc of M S + Conc of M S D) /2 <br /> Laboratory Director <br /> 2100460 RES a7> <br />