Heya
Ours are CCA treated, being so close to the house, they had to be treated. We have lined them with black plastic. I dont know about the other stuff, but lining them is an option.
I have not heard of the other stuff, but I was under the impression that todays CCA treated stuff is not as bad for you as the stuff from the olden days. Or maybe I am just hoping that LOL

ETA, have just googled ACQ and it looks like it should be fine. Go for it I say