On Tue, 16 Oct 2018 14:49:40 -0700 (PDT), True North wrote:

I put a shovel or so of gravel in the bottom of the hole. I like to keep our damp soil away from the treated wood.
I do my mixing in the wheelbarrow. Don't recall seeing the dry mix dumped into the hole and then water sprayed on top.

This isn't 'treated wood', it's cedar. Dampness won't hurt it.