Dock Post removal

Four foot piece of 1/2 or 1 inch pvc. Hose fitting on one end. pvc cap with a small hole drilled in it in the other end. (Hopefully you can get a hose to where the dock is.) Hook the hose to the "water jet" Probe around the stuck post. If it is sand it should loosen right up.

I recently installed 6 x 6 wooden dock legs to a depth of about 3 feet in very clayey sand using such a tool If it works going in, it should work to remove.

That's a cool image of different lake bottom augers and plates. I wish I had more sand under my lift. It's time I put some plywood down to make my lift easier to remove

We have a t-shaped 100 foot by 100 foot floating dock we install and remove each year. We use augers to screw the guide poles into the bottom about two feet, When we want to get them out, we unscrew them with a round bar through a drilled hole near the top-- but getting it out of the much usually takes the following to finish the job. We put a large open jaw pipe vice grip on the pole, and have a bunch of guys stand near it to push the float down on that corner, then we move to the opposite corner and whala! Pulls it right up. Sometimes we need to do it a few times for the stubborn ones. The whole dock goes in with 6-8 guys and 90 minutes. It comes out faster.

Before that we used to herniate ourselves mercilessly.