The Oak tannin thing is a concern. There has been no lime treatment of soil. Perhaps I could throw a few sacrificial fish into the 3' of water and see what happens.
...or use the chain saw to create a pile of chips and wrap them in cheese cloth with a rock for ballast. Put it in a tub of water for a couple of days, then add fish and watch 'em...? (Oak tea, if you will)
