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SEQUOIA IA ANALYTICAL <br /> . � <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> <Kaprealan . <br /> » »»:...: . ����� <br /> ' ...... ::: » . .. ......... <br /> Engineering, Inc. Client Project D Unocal, 835 Navy Drive, <br /> tn <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention: Mardo Kaprealian, P.E. QC Sample Group: 2040923-927 Reported: Apr 24, 1992 <br /> ............................. ........ <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: K.N. K.N. K.N. K.N. A.T./S.L. <br /> Reporting Units: mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg <br /> Date Analyzed: Apr 21, 1992 Apr 21, 1992 Apr 21, 1992 Apr 21, 1992 Apr 23, 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 Cone. <br /> Added: 0.40 0.40 0.40 1.2 900 <br /> Cone. Matrix <br /> Spike: 0.34 0.34 0.38 1.1 816 <br /> Matrix Spike <br /> %Recovery: 85 85 95 92 91 <br /> Conc. Matrix <br /> Spike Dup.: 0.35 0.34 0.37 1.1 80 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 88 85 93 92 90 <br /> Relative <br /> %Difference: 2.9 0.0 2.7 0.0 10 <br /> Laboratory blank contained the following anlaytes: None Detected <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Cone.of Sample x 100 <br /> Spike Cone.Added <br /> ' Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Belinda C.Vega / nc.of M.S. + Cone.of M. .D. 2 <br /> Laboratory Director 2040923, r <3> <br />