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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord Californsa 94520 <br /> (510) 686-9600 0 FAX (510) 686-9689 <br /> OAlton Geoscience Client Project ID Mobil #04 NP4/ 30-0140-02 <br /> 5870 Stoneridge Drive, Surte 6 <br /> Pleasanton, CA 94588 <br /> Attention Cyril Yong OC Sample Group 205-0799 Reported May 21, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Diesel <br /> Method EPA8015 <br /> Analyst K W+mer <br /> Reporting Units u9/L <br /> Date Analyzed May 22 1992 <br /> QC Sample # Matrix Blank <br /> Sample Conc N D <br /> Spike Conc <br /> Added 300 <br /> Conc Matrix <br /> Spike 280 <br /> Matrix Spike <br /> % Recovery 94 <br /> Conc. Matrut <br /> Spike Dup. 280 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 94 <br /> Relative <br /> % Difference 00 <br /> SEQUOIA ANALYTICAL %Recovery ---Cone of M nc of Sample x 100 <br /> Spike nc Added <br /> Relative% of ference Conc of M S -Cone of MSD x 100 <br /> Scott A Chleffo (Conc of M nc of M S D) 2 <br /> P #2°5°'s� <2> <br /> Project Manager <br />