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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 r�.;J 7 1992 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Alton Geoscience Client Project lD Mobil #04-NP4/30-0140-10 <br /> 5870 Stoneridge Drive, Svlte 6 <br /> Pleasanton, CA 94588 <br /> Attention Cyril Yong OC Sample Group 207-0949 Reported Jul 31, 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 EPA8015 <br /> Analyst A.T A_T A.T AT K Wimer <br /> Reporting Units frg/L pg/L pg/L pg/L ug/L <br /> Date Analyzed Jul 29, 1992 Jul 29, 1992 Jul 29, 1992 Jul 29, 1992 Jul 30, 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: 19 19 20 63 263 <br /> Matrix Spike <br /> % Recovery: 95 95 100 105 87 <br /> Conc. Matrix <br /> Spike Dup.: 20 20 20 64 323 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 100 100 107 108 <br /> Relative <br /> %Difference: 51 51 00 16 22 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S - of ample x 100 <br /> Spike Cone Added <br /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> Scott A Chleffo (Conc of M S + Cone.of M S D)7-2 <br /> Project Manager <br />