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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 ,SUN 25 1W <br /> (510) 686-9600 FAX (510) 686-9689 <br /> • Alton Geoscience Client Project ID Mobil #04-NP4/30-0140-02 <br /> 5870 Stonendge Drive, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention Cyril Yong QC Sample Group 206-0561 Reported Jun 22, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Ckesel <br /> EPA EPA EPA EPA <br /> Method 8015/802o 8095/8020 8015/8020 8015/8020 EPA8015 <br /> Analyst J F J F J F J F K Wimer <br /> Reporting Units frg/L Ng/L Ns/L Ng/L p9/L <br /> Date Analyzed Jun 16, 1992 Jun 16, 1992 Jun 16, 1992 Jun 16, 1992 Jun 18, 1992 <br /> QC Sample # Matrix Blank Matrix Blank Matrix Blank Matrix Bunk Matrix Blank <br /> Sample Cone • N D N D N D N D N D <br /> Spike Cone. <br /> Added' 20 20 20 60 300 <br /> Cone. Matrix <br /> Spike: 20 20 20 64 288 <br /> Matra Spike <br /> %Recovery: 100 100 100 106 96 <br /> Cone Matrix <br /> Spike Dup.: 20 20 20 64 295 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 100 100 100 106 98 <br /> Relative <br /> % Difference: 00 00 00 00 24 <br /> SEOUDIA ANALYTICAL %Recovery Conc of M S -Oine of Sample x 100 <br /> _Sp_Spike' Added <br /> Relator%Difference Conc of M S -Cone of M S D x 100 <br /> Scott A Chieito ( of M + of M D 2 POM5611 A1_1 -43> <br /> Project Manager <br />