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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> ERM-West n Client Project ID #1572 04/Catellos-Stockton <br /> 1777 Botelho Dr, Suite 260 <br /> Walnut Creek, CA 94596 <br /> Attention Bruce Pfasf QC Sample Group 2040108-111 Reported Apr 28, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> I' ANALYTE Tnehlaro- Chloro- <br /> 1,1-Dichloroethens ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst M Nguyen M Nguyen M Nguyen <br /> ' Reporting Units ug/L ug/L ug/L <br /> Date Analyzed Apr 16, 1992 Apr 16, 1992 Apr 16, 1992 <br /> QC Sample # Matrix Blank Matrix Blank Matrix Blank <br /> Sampie Conc : N D N D N D <br /> MSpike Conc. <br /> Added. 10 10 10 <br />' Conc Matrix <br /> Spike. 84 98 92 <br /> Matrix Spike <br /> %Recovery, 84 98 92 <br /> Conc. Matrix <br />' Spike Dup : 79 92 87 <br /> Matrix Spike <br /> Duplicate <br />' %Recovery: 79 92 87 <br /> Relative <br /> %Difference- 13 64 56 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL x Recovery Nnc of ne of Sample x 100 <br /> Spike Cone de <br /> Relative%Dtference Conc of M S -Cone of MSD x 100 <br /> Kenneth K.F Lee ne of M S + Cone of 2 <br /> Laboratory Manager -3- <br />