Hello everyone. I'm new to the forum. I've recently purchased a 21' AGP by Sharkline. I'm doing the install myself. The soil base here is mostly clay. The problem I'm having is a small portion of my base is clean topsoil. The top soil portion has ground water leaching onto it and it's mushy and will not dry out. I had to dig from 0" to 30" to have a level base. With this soft spot I cannot continue building. And regardless of what I do, water will keep seeping out. There was a tree stump near where the ground water is coming from. I've read that people have used Portland cement, I've thought about over digging the soil area and backfilling with crushed rock. I'm not sure how to tackle this. Any thoughts?