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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> 1510) 686-9600 FAX (510) 686.9689 <br /> on Geoscience . . Client Project ID: Mobil #04-343/30-0136-01 <br /> 5870 Stoneridge Drtve, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention: Stephan Rosen DC Sample Group: 2041094-1102 Reported: May 4, 19;Z <br /> QUALITY CONTROL DATA REPORT <br /> ANALY'rE Ethyl <br /> Benzene Toluene Benzene Xylenes Qiesel <br /> EPA EPA EPA EPA <br /> Method: 8015/8020 8015/8020 8015/8020 8015/8020 EPA8015 <br /> Analyst: K.E. KE. KE. KE. A Tuzon <br /> Reporting Units: ug/L uy/1_ ug/L ug/L ug/L <br /> Date Analyzed: Apr 28, 1992 Apr 28, 1992 Apr 28, 1992 Apr 28, 1992 May 4, 1992 <br /> OC Sample#: Matrix$lank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> *Spike Conc. 300 <br /> Added: 20 24 20 60 <br /> Conc. Matrlac <br /> Spike: 16 16 18 53 274 <br /> Matrix Spike80 90 gg 91 <br /> %Recovery: 80 <br /> Conc.Matrbx <br /> Spike Dup.: 16 16 18 53 237 <br /> Matrix Spike <br /> Duplicate 88 79 <br /> %Recovery: 80 80 90 <br /> Relative <br /> %Difference: 0.0 0.0 0.0 0.0 14 <br /> 0SEOU01A ANALYTICAL % c• pie x 100 <br /> Soke t5iF Added <br /> fieletive%Diilereria: Conc.01 M.S.-Conc.of M.S.D. x 100 <br /> Soots A Ch effo . + c .0 2 <br /> 1 � <br /> Project Manager <br />