Mike, that's REALLY acidic!
The experts will soon have their say, but until they do I'd say a minimum of five tons of lime. Six might be better. Get it worked into the soil, if at all possible.
If water runs through your pond quickly, you might even need a bit more.
My watershed is on acidic pine plantation land, though not so extreme as yours, and I had four tons per acre put on.
Just my two cents...
