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SEQUOINALYTICAL <br /> 1900 Bates Avenue uite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> W.V1l:irwiri Client Project ID: 033014.00/Embarcadero, Stockton <br /> P.O. Box 2242 <br /> Merced, CA 95344 <br /> Attention: Roy Austin QC Sample Group: 2060650-655 Reported: Jul 1, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Trichloro- Chloro- <br /> 1,1-Dichloroethene ethene benzene <br /> Method: EPA 8010 EPA 8010 EPA 8010 <br /> Analyst: M. Nguyen M.Nguyen M. Nguyen <br /> Reporting Units: Ng/kg Ng/kg Ng/kg <br /> Date Analyzed: Jun 19, 1992 Jun 19, 1992 Jun 19, 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: 8.4 10 9.4 <br /> Matrix Spike <br /> %Recovery: 84 100 94 <br /> Conc. Matrix <br /> Spike Dup.: 8.9 10 9.4 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 89 100 94 <br /> Relative <br /> %Difference: 5.8 0.0 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 /> `� --J Relative%Difference: Conc.of M.S. Conc.of M.S.D. x 100 <br /> �'Karen L.'Enstrom (Conc.of M.S. + Conc.of M.S.D.)/2 2060650.WWI <7> <br /> 1 Project Manager <br />