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SEQUOIA ANALYTICAL <br /> _ 819 Striker Avenue, Suite 8 e Sacramento CA 95834 <br /> y , <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> r $ <br /> EMCON Associates Client Project ID Shell, 420 W Kettleman Ln , Lodi v 3 <br /> 1433 N Market Blvd <br /> Sacramento, CA 95834 <br /> Attention Jim Pittilla QC Sample Group 2100086-90 Reported Oct 16, 1992 <br /> QUALITY CCNTROL DATA REPORT <br /> ANALYTi` <br /> Benzene Toluene Ethylbenzene X ones <br /> Method EPA 602 EPA 602 EPA 802 EPA 602 <br /> Analyst Ctuaravalkrtl C hlaravalk)t Chiaravallotl Chiaravalbtr <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Oct 13, 1992 Oct 13, 1992 Oct 13, 1992 Ckt 13, 1992 <br /> QC Sample# 210-0090 210.0090 210.0090 2104090 <br /> Sample Cone.: ND N D N D N D <br /> Spike Cone. <br /> Added: 10 10 10 20 <br /> COCK. Matrix <br /> Spike: 82 87 86 17 <br /> Matrix Spike <br /> %Recovery: 82 87 86 85 <br /> Corte. 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 Sam le x 100 <br /> . Spike Cone Added . <br /> Relative%Differenoe Conc of M S -Conc.of M&D x 100 <br /> Michael R Giles (Cone of NIS + Cone of M S D)/2 <br /> Laboratory Director <br /> 2100066 EMC <3> <br />