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NORTH <br /> =CREEK <br /> _ =ANALYTICAL <br /> 18939 120th Avenue N E,Surle 101 •t3otheq,WA 98011-2569 <br /> Phone (206)481-92W•FAX(206) 485-2992 <br /> Steffen Robertson &Kirsten Client Project ID Diamond Lumber#32504 22 Analyst 7EssIg <br /> 15311 NE 90th Street Method • EPA 5030/8020 Redmond,WA 98052 Sample Matrix• Water <br /> Attention Dave Schwleger Unhs . ug/L Analyzed AOC Sam e # 204-0413 Reported A <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene Xylenes <br /> Sample Conc • N D N D N D N D <br /> ' Spike Conc <br /> Added 50 5o 50 150 <br /> Conc. Matrix <br /> IRSpike 52 42 48 134 <br /> Matrix Spike <br /> % Recovery 104 84 96 89 <br /> Conc Matrix <br /> Spike Dup . 50 4 4 so 142 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery, 100 88 100 95 <br /> Relative <br /> % Difference- 39 4 7 4 1 58 <br /> H CIaEEK ANALYTICAL Inc x Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S •Conc of M S D x Top <br /> CocBnour {Conc of M S + Conc o!M S D] 2 <br /> 1boratory Director <br /> 2040434 SRK <3> <br />