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i <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 J U N 2 9 1992 <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 QC Sample Group 206-0752 Reported Jun 25, 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 EPA 8015 <br /> Analyst AT AT AT AT K Winner <br /> Reporting Units ug/L u9/L ug/L ug/L ug/L <br /> Date Analyzed Jun 18, 1992 Jun 18, 1992 Jun 18, 1992 Jun 18. 1992 Jun 26, 1992 <br /> QC 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 /> Spike Conc. <br /> Added: 20 20 20 60 300 <br /> Conc. Matrix <br /> Spike: 22 22 23 71 298 <br /> Matrix Spike <br /> %Recovery: 110 110 115 918 99 <br /> Conc. Matrix <br /> Spike Dup.: 22 23 23 72 293 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 110 115 115 120 98 <br /> Relative <br /> %Difference: 00 44 00 14 17 <br /> SEQUOIA ANALYTICAL %Reoovery -Conc of M cot pie x 100 <br /> Spike Added <br /> Relative%Difference Cone of M S -Conc of M S D x 100 <br /> S A.yChc of 144 + of M D 2 <br /> Project Manager <br />