I have been working with polymers to seal my pond and you might be able to do it for less than $10,000. It can also be applied with water in the pond. If you are interested in this product, PM me and I will send you the info. For $100,000 it would be worth looking into.

"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery."
Winston Churchill