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` r ` SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 -1 Sacramento CA 95834 <br /> (916) 921 9600 9 FAX (916) 921 0100 <br /> IDEMCON Associates Client Project lD Shell, 420 W Kettleman Ln , Lodi <br /> 1433 N Market Blvd <br /> Sacramento, CA 95834 <br /> Attention Jim Pittilla CC Sample Group 2100086-90 Reported Oct 16, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene X enes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravallot ChiaravallotE ChiaravaiioL Chiaravalloti <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Oct 13, 1992 Oct 13 1992 Oct 13, 1992 Oct 13, 1992 <br /> OC Sample # 210-0090 210-0OM 210-0090 210-0090 <br /> Sample Cone N D N D N D N D <br /> Spike Cone <br /> Added: 10 10 10 20 <br /> Cone. Matnx <br /> Spike- 82 87 86 17 <br /> Matrix Spike <br /> % Recovery- 82 87 86 85 <br /> Cone Matrix <br /> Spike Dup . 81 87 86 16 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery, 81 87 86 80 <br /> Relative <br /> % Difference- 12 00 00 61 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sampie x 100 <br /> Ofiwt& d Spice Cone Added <br /> ` . RelaLve%Difference Conc of M S -Cone of M S D x 100 <br /> Michael R Giles (Cone of M S + Cone of M S D) 2 <br /> Laboratory Director <br /> 2100086 EMC <3> <br />