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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 #2176, Lodi <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 1120057-58 Reported Dec 9, 1991 <br /> 1 <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 /> Deporting knits ppm ppm ppm ppm <br /> Date Analyzed Dec 6 1991 Dec 6 1991 Dec 6 1991 Dec 6 1991 <br /> QC Sample # 111-0739 111-0739 111-0739 111-0739 <br /> Sample Conc N D N D N D N D <br /> Spike Conc <br /> Added 020 0 20 020 0 40 <br /> Conc Matrix <br /> Spike 017 017 0 17 036 <br /> Matrix Spike <br /> % Recovery 85 85 85 90 <br /> Conc Matrix <br /> Spike Dup 017 017 017 034 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 85 85 85 85 <br /> Relative <br /> %Difference 0 0 0 0 0 0 57 <br /> 0 SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> e � Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Rick R DlMaio (Conc of NIS + Conc of M S D)/2 <br /> Project Manager 1120057 RES <3> <br />