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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> ......... ... <br /> ;Alton Geoscience Client Project ID. 04-343/30-136-01 <br /> 1000 Burnett Ave. Suite 140 <br /> Concord, CA 94520 <br /> ,.,.Attention: Tri i <br /> dbGuha <br /> QC Sample Group:. 1i11351-i11135 <br /> Reported:ed: Dec 9 1 991 <br /> 't <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: J.Dinsay J.Dinsay J.Dinsay J.Dinsay A.Tuzon <br /> Reporting Units: ppb ppb ppb ppb P9/L <br /> Date Analyzed: Dec 4, 1991 Dec 4, 1991 Dec 4, 1991 Dec 4, 1991 Dec 6, 1991 <br /> OC Sample#: Matrix Blank Matrix Blank Matrix Blank Matrix Blank Blk12o591 <br /> Sample Conc: N.D. N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 10 10 10 30 300 <br /> I <br /> Conc. Matrix <br /> Spike: 11 11 10 31 260 <br /> Matrix Spike <br /> %Recovery: 110 110 100 103 86 <br /> Conc. Matrix <br /> Spike Dup.: 12 12 11 34 250 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 120 120 110 113 83 <br /> Relative <br /> %Difference: 8.7 8.7 9.5 9.2 3.9 <br /> Laboratory blank contained the following anali a'S• No—Ine D—/�tecU A <br /> V• V!IG LGIGI.lWV <br /> 665EQU IA ANALYTICAL %Recovery: Conc.of M.S.-Conc,of Sample x 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Cone.of M.S.D. x 100 <br /> Scott A. Chieffo (Conc.of M.S. + Conc.of M.S.D.) 2 <br /> Project Manager 1111351.ALS <3> <br />