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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 Geoscience Client Project ID Mobil #04-NP4J 30-0140-02 <br /> 5870 Stonendge Drive, Suite 6 <br /> Pleasanton,CA 94588 <br /> Attention CyN Yong QC Sample Group 206-0161 Reported .Jun 12, 1992 <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 8015/8020 EPAS015 <br /> Analyst J F JF J F JF K Khmer <br /> Reporting Units ug/L ug/L ug/L ug/L ug/L <br /> Date Analyzed Jun 5, 1992 Jun 5, 1992 Jun 5, 1992 Jun 5, 1992 Jun 10, 1992 <br /> OC Sample# Matrix Blank Matrix Blank Matrix Bunk Matrix Blank Matrix Blank <br /> Sample Conc : N D N D N D N D N D <br /> Spike Cone. <br /> Added* 20 20 300 <br /> Conc. Matrix <br /> Spike: 20 20 20 63 260 <br /> Matrix Spike <br /> %Recovery: 100 100 100 105 87 <br /> Conc. Matrix <br /> Spike Dup.: 20 20 20 63 270 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 100 100 100 105 90 <br /> Relative <br /> %Difference: 00 00 00 00 38 <br /> SEQUOIA ANALYTICAL %recovery* Conc of M S - nc of Sample x 100 <br /> Spike Conc Added <br /> fielatrve%Dwerence Conc of M S -Conc of M S D x 100 <br /> Scott A. eff0 of M + of M 9D) 2 =181ALT S3> <br /> Project Manager <br />