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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord, California 94520 <br /> (510) 686-9600 - FAX (510) 686-9689 <br /> aprealian Engineering, Inc Client Project ID Unocal #5421, 7303 PaCdLc Ave, Stockton <br /> 401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2110456-459 Reported Nov 24, 1992 <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 K Nill K Nil[ K Niil <br /> Reporting Units ug/L pg/L pg/L <br /> Date Analyzed Nov 17, 1992 Nov 17, 1992 Nov 17, 1992 <br /> OC Sample# Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone N D N D N D <br /> Spike Conc <br /> Added 10 10 10 <br /> Conc Matrix <br /> Spike 12 10 11 <br /> Matrix Spike <br /> % Recovery 120 100 110 <br /> Conc Matrix <br /> Spike Dup 12 10 11 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 120 100 110 <br /> Relative <br /> % Difference 00 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 /> o <br /> EQUOI ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> r Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Ott A hl o (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2110456 KEI <7> <br />