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SEQUOIA ANALYTICAL <br /> 1900 Bates A enue • Suite LM • Concord California 94520 <br /> 1510) 686 9600 FAX (510) 686 9689 <br /> Alton Geoscience Client Project ID Mobil #04-NP4/30-0140-02 <br /> 5870 Stoneridge Drive, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention Cyril Yong CC Sample Group 2051242-43 Reported 5/290 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8024 EPAS015 <br /> Analyst AT A.T AT AT K Wimer <br /> Reporting Unas ug/L ug/L ug/L ug/L ug/L <br /> Date Analyzed May 28 1992 May 28 1992 May 28 1992 May 28, 1992 May 29, 1992 <br /> OC Sample # Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc N D N D N D N D N D <br /> 0 Spike Conc <br /> Added' 20 20 20 60 300 <br /> Conc Matrix <br /> Spike: 22 23 21 72 290 <br /> Matrix Spike <br /> %Recovery: 110 115 105 120 97 <br /> Conc. Matrix <br /> Spike Dup.: 21 22 22 68 290 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 105 110 110 113 97 <br /> Relative <br /> % Difference: 47 44 47 57 00 <br /> 0-EQU A ANALYTICAL %Recovery -Conc of M -Conc of Sample x 1x10 <br /> Spike Conc Added <br /> r <br /> Relative%Qhfference Conc of M S Conc of M S D x 100 <br /> Scott A Chlef{O (Conc of M S + Conc of M S D) /2 a , <br /> Prosect Manager <br />