[landarc]

The caveat with pressure treated wood without the old treatments is that it does seem to be more susceptible to decay. In fact, in our experience in California, pressure treated wood is rapidly losing favor to other materials as it is not a long term solution where soil contact is considered. The process, more so thatn the chemicals seem to be at fault, with deoth of chemical treatment being the biggest issue. In fact, most of the manufacturers no longer warranty the produict for soil contact at all. The key is keeping moisture from building up in contact with the wood. One of the ways we see this being achieved, is by backing the walls with drain rock wrapped in filter fabric to a width of at least 6" and leaving a gap of 1/2" above grade to allow drainage. Also, many advocate that all cut ends be treated with preservative prior to assembly of structures.

BTW, as recently as a year ago, I saw some old stock with CCA tags, there is still some old illegal stock out there. As well as Wolmanized lumber.