4 ton/acre is typical crop land application rate on the acidic soils that we have here in the midwest.
Not sure how that relates to soils in DET, but with 6.2ph I can't imagine that 10 ton in a 1.5ac pond would do anything but help it out.

Maybe think about having another load or three spread on the watershed near your pond, and let Mother Nature put it in the pond when the monsoon comes.

I put ~100 ton of crushed limestone in my 1/3ac puddle before it filled.