Pond Boss Forums POND CONSTRUCTION Renovating a Pond or Lake? Many trees on the dam, Leaking dam

I'd second what Ken said in the other thread. Remove any trees and their roots that are over 4" diameter, just pull out any uncer that sise. Cut in a core trench, down to you hit good soil, and continue it out past the ends of the dam until you hit good soil. Pack it with clay up above the proposed water level and you'll be good.