I was afraid of that. How would I go about packing the key? Would a track hoe be enough to pack it using the bucket? Or would I have to drain the pond remove the dirt to the old dam and then do the key? One thing I forgot to mention, there were several trees on the old dam. I found out later that when you cut the trees down and the roots die that was a potential for leaks. Wish I would have consulted this site before I took this project on myself!