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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 Client Project ID Arco #2076, Lodi <br /> 13164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 1110809-12 Reported Dec 5, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <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 /> i Date Analyzed Dec 4, 1991 Dec 4 1991 Dec 4, 1991 Dec 4, -1991 <br /> OC Sample # 112-0044 112-0044 112-0044 112 0044 <br /> Sample Conc N D N D N D N D <br /> 1 � Spike Conc. <br /> Added 020 020 020 040 <br /> Conc. Matrix <br /> Spike 018 018 018 037 <br /> Matrix Spike <br /> % Recovery: 90 90 90 93 <br /> Conc Matrix <br /> Spike Dup. 017 017 017 035 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 85 85 85 88 <br /> Relative <br /> % Difference. 57 57 57 55 <br />�`SAEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> CIA-0��(� Spike Conc Added <br /> Ae-- Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Rick R DlMalo (Conc of M S + Conc of M S D)/2 <br /> Project Manager 1110809 RES .48> <br />