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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM a Concord, California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 <br /> Kaprealtan Engineering, Inc Client Project ID Unocal,73033 Pacific Ave,Stockton <br /> P O Box 9% <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E OC Sample Group 1030899-902 Reported Apr 10, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Trichloro- Chloro- <br /> 1,1-Dichloroethene ethane benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst E Hamilton E Hamilton E Hamilton <br /> Reporting Units ug/L ug/L vg/L <br /> Date Analyzed March 27,1991 March 27, 1991 March 27,1991 <br /> QC Sample # 103-0763 103-0763 103-0763 <br /> Sample Conc.- N D N D N D <br /> . Spike Conc. <br /> Added: 10 10 10 <br /> Conc Matrix <br /> Spike 67 82 10 <br /> Matrix Spike <br /> %Recovery: 67 82 100 <br /> Conc Matrix <br /> Spike Dup.: 60 78 11 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery. 60 78 110 <br /> Relative <br /> % Difference 11 50 95 <br /> OEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> r Relative%Difference Conc of M S -Cone of M S D x 100 <br /> Belinda C Vega (Conc of M S + Conc of M S D)J 2 1030699 KEI <13� <br /> Laboratory Director <br />