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' SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> 1 <br /> RESNA Industries' Client Protect ID Arco #6020, Manteca <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Altiman QC Sample Group 2120558-61 <br /> Reported Jan 5, 1993 <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene X lenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units jug/l- us/L ug/E pg/L <br /> Date Analyzed Dec 22, 1992 Dec 22 1992 Dec 22 1992 Dec 22 1992 <br /> QC Sample# 212-0574 212-0574 212-0574 212-0574 <br /> Sample Conc - N D N D N D N D <br />• Spike Conc. <br /> Added: 10 10 10 20 <br /> Conc. Matrix <br /> Spike. 82 85 86 17 <br /> Matrix Spike <br /> % Recovery 82 85 86 85 <br /> Conc. Matrix <br /> Spike Dup.. 84 89 90 18 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 84 89 90 90 <br /> Relative <br /> % Difference- 24 46 4 5 57 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br />-!SEQUOIA ANALYTICAL %RecoveryConc of M 5 -Conc of Sampie x 100 <br />�I <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles {Conc of M S + Conc of MSD) /2 <br /> Laboratory Director <br /> 2120558 RES <3> <br />