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Hmmm... Bentonite clay liner can be done with sandy soils, but it'll probably not be cost effective. When I searched for liners for our project (which was smaller than yours) I couldn't find a supplier that could make a single piece for this project. Doesn't mean one isn't out there, just that I couldn't find one.
So you'll have to consider how and where you'll attach one liner to the next - not where on the liner, but where geographically - a parking lot would be ideal, so hopefully there is one near where the pond will be going in. Trying to attach one to the next once inside the pond would seem nearly impossible without having leaks.
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