They need to call a place that sells oilfield chemicals & buy a few sacks of bentonite. If they let the water get low & spread the bentonite (it's a powder) all over the ground, when they refill the hole the water & bentonite make a gel that will seal the pond & keep it from leaking. I worked for one of those companies 10yrs, we sold bentonite all the time tofarmets for their farm ponds.
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