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f� SEQUOIA ANALYTICAL <br /> 1900 Sates Avenue • Suite LM • Concord California 94520 <br /> t (510) 686-9600 FAX (510) 686-9689 <br /> M-West Client Project ID #1572 04/ Catellos-Stockton <br /> 1777 Botelho Dr, Suite 260 <br /> Walnut Creek, CA 94596 <br /> Attention Bruce Piasf QC Sample Group. 2040108-111 Reported Apr 28, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 7richicro- Chloro- <br /> 11-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 16 1992 Apr 16 1992 Apr 16 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- 84 98 <br /> 9 2 <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 6 4 5 6 <br /> Quaitty Assurance Statement*All standard operating procedures and quality control requirements have been met <br /> EQUOIA ANALYTICAL %Recoveny Cone of M S - ric o1 Sample x 100 <br /> x pie cone Added <br /> Relative%Difference Conc of MS -Conc of M S 0 x 100 <br /> Kenneth KF Lee ( nc or M + nc of M S D)/2 *2CAGIOSERM <3> <br /> ' Laboratory Manager <br />