Is this a project you want to hire someone for (it is Salmon season and you should be fishing after all)? I know a guy. He even has a boat and can deliver the material right to the dock, and do the work. . . .He has worked on a couple of docks on Hunts Point as well. . . . . . As far as the material, unless you are ready to resurface the entire dock, get the same dimension lumber you have in the higher grade PT. I can get you a bit of a discount at Dunn if you like.

If you are looking to reface the whole thing, I would go with a Trex type material, long lasting, no sealing, no SPLINTERS. Downside is the dock may need some extra framing for the reduced span capabilities of Composites, same issue with Ipe (unless you go with the 2x6= $$$$).