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Pressure Treated Wood

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What specs apply to pressure treating wood ? I see tags on landscaping 
timbers like 6x6x8 that say "Ground Contact", "0.40 PCF", and "CCA-C". I 
assume this means the wood contains chromated copper arsenate at the rate of 
.4 lbs of cca per cubic foot of wood. Are there applications that require 
would a higher rate of cca ? Thanks.