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SEQUOIA ANALYTICAL <br />' 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (415) 686-9600 • FAX (415) 686-9689 <br />' Geological Audit Services, Inc Client Project ID Genova Bakery <br /> rY <br /> Attention Victor Cherven OC Sample Group 1060282-85 Reported Jun 26, 1991 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> I <br /> Method EPAS015/8020 EPA8015/8020 EPA8015/8020 EPAS015/8020 <br />' Analyst JF/RH JF/RH JF/RH JF/RH <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Jun 21, 1991 Jun 21, 1991 Jun 21, 1991 Jur, 21, 1991 <br /> OC Sample# BLK062191 BLK062191 BLK062191 BLK062191 <br /> Sample Cone - N D N D N D N D <br /> Bike Cone <br /> Added 040 040 040 12 <br /> Conc. Matrix <br /> Spike 035 034 034 1 1 <br /> Matrix Spike <br />' % Recovery 88 85 85 92 <br /> Cone Matrix <br /> Spike Dup. 045 043 045 14 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery. 110 110 110 120 <br /> Relative <br /> %Difference 25 23 28 24 <br /> I <br /> 3 01 1.101A ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> 19011 <br /> Spike Cone Added <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Julia R Malerstein (Conc of M S + Cone of M S D) 2 <br /> Project Manager 1060282 GGG <2> <br />