I am at the very early stages of building a 1.5 acre pond on 10 acres that is fairly flat and was used as farmland. It is extremely sandy with clay being found at 15' The plan is to dig down 23-25' to bring up enough clay to pack the sides and bottom to have 5'thick clay walls. It is also extremely wet. They were stuck on multiple occasions just stripping off the top soil. Currently they have trenched 3 drainage pipe 5' down and have them dumping into a catch basin. It has been pumping constantly for 2.5 weeks. They plan on digging in 5' increments. As we get more into this the more nervous I get. Any thoughts on if this sounds like a reasonable plan?