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r NORTH <br /> CREEK <br /> =�ANALYTICAL <br /> 18939 120th Avenue N E,Suite 101 • Bothell,WA 99011.2569 <br /> Phone (206) 481-9200•FAX (206)495-2992 <br /> =xwk.�'� <br /> ' # Steffen Robertson <br /> oni Kirsten Client Project ID Diamond Lumber#32504 22 Analyst D Vandel <br /> 15311 NE 90th Street Method • EPA 7421 <br /> Redmond,WA 98052 Sample Matrbc Water Digested Apr 10, 1992 <br /> Attention Dave Schweger Units erg/L Analyzed Apr 28, 1992 <br /> OC Sample# SLK041092 ReDorted Apr 29, 1992, <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 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 /> ' Relative <br /> % Difference. 14 <br /> RTH CREEK ANALYTICAL Inc %Recovery' Conc of M S -Conc of Sample X1 <br /> Spike Conc Added <br /> Relative% Difference Conc of MS -Conc of M 5 D x 100 <br /> S Cocanour {Conc of M S + Conc of M S D) 2 — <br /> boratory Director <br /> 2040434 SRK <4> <br />