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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 v Client Project ID Arco #6100,Tracy, CA <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek OC Sample Group 110-0134 Reported Oct 22, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene-� Ethyl benzene Xylenes��� <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Oct 17, 1991 Oct 17 1991 Oct 17 1991 Oct 17, 1991 <br /> QC Sample# 110-0134 110-0134 110-0134 110-0134 <br /> Sample Conc . 0 017 0 033 00052 0 022 <br /> r� <br /> Spike Conc. <br /> Added: 010 010 010 020 <br /> Conc Matrix <br /> r Spike: Oil 032 010 022 <br /> Matrix Spike <br /> %Recovery: 90 99 99 100 <br /> 1 Conc. Matrix <br /> Spike Dup.: 0 097 Oil 0 097 020 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 80 80 92 90 <br /> 1 <br /> Relative <br /> %Difference: 12 10 73 12 <br /> t <br /> SEQUOIA ANALYTICAL %Recovery Cana of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> 1 Michael R Giles (Conc of M S + Conc of MSD)/2 <br /> Laboratory Director 1100134 APR �2� <br />