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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (510) 686 9600 FAX (510) 686 9689 <br /> Alton Geosclence talent Project ID Mobil #10-NP4/30-0140-02 <br /> 5870 Stonerldge Rd , Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention Stephan Rosen QC Sample Group 2031183-1195 Reported Apr 2, 1992 <br /> QUAL TY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst KE K E K E K E <br /> Reporting Units ug/L ug/L ug/L u9/L <br /> Date Analyzed Mar 27, 1992 Mar 27, 1992 Mar 27 1992 Mar 27, 1992 <br /> QC Sample# Matrix Blank Matnx Blank Matrix Blank Matrix Blank <br /> Sample Cone.- N D N D N D N D <br />. Spike Cone. <br /> Added: 20 20 20 60 <br /> Cone Matrix <br /> Spike: 20 23 23 62 <br /> Matrix Spike <br /> %Recovery: 100 115 115 103 <br /> Cone. Matrix <br /> Spike Dup.: 20 22 22 60 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 110 110 100 <br /> Relative <br /> % Difference: 00 44 44 33 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> Retatwe%Difference Conc of M S -Conc of M S D x 100 <br /> Cott hief o (Cont of M S + Conc of M S D)/2 <br /> Project Manager 2031183 ALG <4> <br />