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NORTH <br /> ` CREEK <br /> ANALYTICAL <br /> 18939 120th Avenue N E,Sude 101 -Bothell,WA 98011.2569 <br /> Phone(206)481-9200•FAX (206)485.2992 <br /> Steffen Robertson& Kirsten Client Project ID. Diamond Lumber 0 32504 22 Analyst. D.Vandal <br /> 15311 NE 90th Street Method. EPA 7421 <br /> Redmond, WA 98052 Sample Matrix: Water Digested Apr 10, 1992 <br /> Attentlon Dave Schwfeger Units :erg/L Analyzed Apr 28, 1992 <br /> QC Sample . BLK041092 Re rted Apr 29, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Pb <br /> Sample Conc.: N D <br /> Spike Conc. <br /> Added: 30 <br /> Conc. Matrix <br /> Spike: 30 <br /> Matrix Spike <br /> % Recovery. 100 <br /> Conc. Matrix <br /> Spike Dup.: 26 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 87 <br /> t� <br /> I Relative <br /> % Difference. 14 <br /> J <br /> 1 <br /> ' I <br /> li <br /> TH CREEK ANALYTICAL.Inc %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%D,fferenee Conc of MS -Cone of M S D x 100 <br /> Cocanour (Conc of MS + Conc of M S D i 2 <br /> tboratory Direc <br /> torr <br /> 2040434 SRiC <4> <br />