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1: I SEQUOIA ANALYTICAL <br /> 1900 Sates Avenue • Suite LM • Concora California 94520 <br /> Ito (510) 686-9600 FAX (510) 686-9689 <br /> -West Client Project IQ #1572 04/ Catellos-Stockton A <br /> 777 Botelho Dr, Suite 260 <br /> Walnut Creek, CA 94596 <br /> ttentlon Bruce Pfasf QC Sample Group 2040108-111 Reported Apr 28, 1992 <br />' QUALITY CONTROL DATA REPORT <br /> NALYTE Tnchtoro- Chloro- <br /> 11-01chloroethene ethane benzene <br />' Method EPA 8010 EPA 5010 EPA 8010 <br /> Analyst M Nguyen M Nguyen M Nguyen <br /> Reporting Units ug/L ug/L ug/L <br />' Date Analyzed Apr 10, 1992 Apr 10, 1992 Apr 10 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc: N D N D N D <br /> 10 pike Conc. <br /> Added: 10 10 10 <br /> iConc. Matrix <br /> Spike: 10 84 82 <br />' Matra Spike <br /> % Recovery: 100 84 82 <br /> Conc. Matrix <br /> Spike yup.: 93 99 95 <br /> Matrix Spike <br /> Duplicate <br />' % Recovery: 93 99 95 <br /> Relative <br /> % Difference: 73 16 15 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> QUOIA ANALYTICAL %Recovery Come of M no at Sample x 100 <br /> Spike C=c Added <br /> Relative%Difference Conc of MS -Gone ct M S D x 100 <br /> Kenneth K I~ Lee (=no of M S + Gone of M ) 2 <br />' Laboratory Manager W2Mi08 ERM X27 <br />