We have excavated a small backwash settling pond and are planning to install a clay liner. When we reached the bottom depth we hit water and the soil (clayey sand) is very unstable and is pumping . It's basically like walking on a water bed in places. At this point I'm not sure a roller could get in and out without burying itself. I don't expect it to dry out on it's own very quickly. My first thought is to dig a sump, pump it, wait, and pray for no rain. We may have to mix portland or something to stabilize it? The contractor wants to install a poly liner. I am not too fond of this idea if the water table ever reaches above the pond water level.
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