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1 <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord California 94520 <br /> (510) 686-9600 - FAX (510) 686-9689 <br />' ERM-West Client Project ID #1572 04/ Catellos-Stockton <br /> 1777 Botelho Dr, Suite 260 <br /> Walnut Creek, CA 94596 <br /> Attention Bruce Pfasf CC Sample Group 2040108-111 Reported Apr 28, 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 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 /> OC Sample# Matrix Blank Matrix Blank Matrix Blank <br />' Sample Conc.: N D N D N D <br /> Spike Cone. <br /> Added: 10 10 10 <br /> Conc. Matrix <br /> Spike: 10 84 82 <br />' Matrix Spike <br /> %Recovery: 100 84 82 <br /> Conc. Matrix <br />' Spike Dup : 93 99 96 <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 /> SEQUOIA ANALYTICALRecovery Cone of no of Sample x 100 <br /> i <br /> pike nc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> neth K F Lee (Cone of M S + Cone of M S D TT2— <br /> Laboratory Manager #2040108 rHM ` <br />