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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> EAM-West(Walnut Creek)} Clie'WProject (D #1572 Oi, Stoc'kt61n <br /> 1777 Botelho Dr, Suite 260 <br /> Walnut Creek, CA 94596 <br /> Attention Bruce Pfaff QC Sample Group 2060092-102 Reported Jun 19, 1992 <br /> 4.v+vv x.n kk i xr� rrvX i v J.,v. u v . v v.4n..x... v • • • n v ry ` t 4 v vrryn w. v '.v.4it n n r. t ry <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Tnchloro- 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 ug/I- Ng/L ug/L <br /> Date Analyzed Jun 9, 1992 Jun 9, 1992 Jun 9, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone.: N D N D N D <br /> Spike Cone. <br /> Added 10 10 10 <br /> Cone Matrix <br /> Spike. 10 93 83 <br /> i <br /> Matrix Spike <br /> % Recovery: 100 93 83 <br /> Cone. Matrix <br /> Spike Dup.: 11 97 87 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 110 97 87 <br /> Relative <br /> %Difference- 95 42 47 <br /> Quality Assuranoe Statement WI standard operating procedures and quality control requirements have been met <br /> 18SE000IA ANALYTICAL. %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Cone of MS -Conc of M S D x 100 <br /> colt A leffo (Conc of M S + nc of M S D)/2 <br /> Project Manager <br />