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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 /> Kaprealian Engineering, Inc. Client Project ID: Unocal/7303 Pacific Ave., Stockton <br /> P.O. Box 996 <br /> Benicia, CA 94510 <br /> ...:Attention: Mardo Kaprealian, P.E. 99 Sample Group: 112-1160 .Reported.:..Jan..'1,5..,,...1992--J.': <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Trichlono- Chloro- <br /> 1,1-Dichlorcethene ethane benzene <br /> Method: EPA8010 EPA8010 EPA 8010 <br /> Analyst: M.Nguyen M.Nguyen M.Nguyen <br /> Reporting Units: pg/L pg/L pg/L <br /> Date Analyzed: Jan 3, 1992 Jan 3, 1992 Jan 3, 1992 <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: 12 11 13 <br /> Matrix Spike <br /> % Recovery: 120 110 130 <br /> Conic. Matrix <br /> Spike Dup.: 12 10 13 <br /> Matrix Spike <br /> Duplicate <br /> •Recovery: 120 100 130 <br /> Relative <br /> %Difference: 0.0 9.5 0.0 <br /> Quality Assurance Statement:All standard operating procedures and quality control requirements have been met. <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample X 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Belinda C. Vega (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Laboratory Director 1121160.KEI <7> <br />