We had major plumbing replacement in the backyard last fall. We have already filled in the sunken areas with one truckload of topsoil. We are going to need more. The first load was mostly clay. We are thinking of getting nicer soil to mix in with it. My question is, are we on the right track? And, if so, can we mix it all up with a roto tiller? Also, what should we do to the bare part
(very large area) before planting grass seed in the fall? Please help!