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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord, California 94520 <br /> via— (510) 686-9600 - FAX (510) 686-9689 <br /> Waprealian Engineering, Inc Client Project ID Unocal, 5606 Pacific Ave, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kapreahan, P E QC Sample Group 2121175-78 Reported Jan 12, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Tnchloro- Chloro- <br /> 1,1-Dichloroethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nill K Nill K Nill <br /> Reporting Units fig/L fig/ ug/L <br /> Date Analyzed Jan 7, 1993 Jan 7, 1993 Jan 7, 1993 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc N D N D N D <br /> . Spike Conc. <br /> Added 10 10 10 <br /> Conc Matrix <br /> Spike 86 10 10 <br /> Matrix Spike <br /> % Recovery, 86 100 100 <br /> Conc. Matrix <br /> Spike Dup.: 87 10 10 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 87 100 100 <br /> Relative <br /> %Difference 1 2 00 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Laboratory Blank contained the following analytes None detected <br />*;SE4(QU1AANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc ofMS -Conc ofMSD x 100 <br /> hleffo (Conc of M S + Conc of M S D)T2- <br /> Project Manager 2121175 KEI <y> <br />