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They haven't used CCA for 20+ years.It is good that you are using linoleum to cover the pressured treated wood because they at one time used (CCA-C) Chromated Copper Arsenate
( Arsenic )..
I don't know if they still use it in there or not but hate to here that it is and a chicken has been scratching and pecking and maybe even eating it...
http://en.wikipedia.org/wiki/Chromated_copper_arsenate
Chris