I'd take them all out, and here's why.

It's hard to ensure that the pond basin is compacted properly with the trees there. If you have a large amount of water available to keep the pond full if the existing trees caused a leak, then I would be OK with leaving them there. If not, I'd sure feel better about taking them out, compacting the pond basin and then not have to worry about the possibility of having to fix it later..

You can stockpile the trees and use them for cover in the pond after the bottom is compacted.


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