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r <br /> ` SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Industries Client Project ID Arco #2076, Lodi <br /> 3164 Gold Camp Dave, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick OC Sample Group 1110689-92 Reported Nov 22, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Senzere Xyleres <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br />` Date Analyzed Nov 21, 1991 Nov 21, 1991 Nov 21, 1991 Nov 21, 1991 <br /> OC Sample # 1114)690 111-0690 111-0690 111-0690 <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, 019 019 019 038 <br /> I <br /> Matrix Spike <br /> % Recovery 93 93 93 95 <br /> i Conc Matrix <br /> Spike Dup 017 017 017 035 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 86 86 85 88 <br /> Relative <br /> % Difference 78 78 90 76 <br /> SEQUOIA ANALYTI L %Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> RelaLve%Difference Conc of M S Conc of MSD x 100 <br /> Rick R DiMalo (Conc of M s ; Conc of M S D) 2 <br /> Project Manager 1110689 RES <2> <br />