[xoxoxoBruce]

I noticed this pressure treated piling/tie-up post/dock support, in the picture of the tug boat my buddy took.
One of these pressure treated poles is rotting out in a ring around center.
Looks like the outside and maybe the very core took the Chromated Copper Arsenate but in between
may not have been dry enough. There's no cap on these posts and this is salt/very brackish, water.
Something to keep in mind cutting pressure treated wood.