Lots of clay and really squishy
I recently had an addition put on our house and when the foundation was excavated, we ended up using all of the clay to re-grade the entire lawn. I was able to grow grass in the fall hoping to stabilize the yard, but there are areas that are really soft and hold the water due to all the clay. I know I should have put a layer of topsoil down, but we were in a time crunch.
I believe the ground was compacted pretty well, but the clay is keeping the water on the surface. What is my best course of action to firm up the yard? Someone suggested aerating and adding sand. Any thoughts? Thanks much!!