You could bury stumps in a shallow area of the pond opposite the dam and compact a couple feet of clay over it, but I would not bury it in a deeper part or you might get leaks. After clearing trees and the first burn I took a chain saw after the ashes cooled and cut up and re-burned what I could. We buried the stumps just above the pond, beyond the water's reach opposite the dam. I have had to fill it in twice since we buried last Nov, but it was not well compacted. I think it won't settle much more now.
