I just had my backyard excavated to replace 70' of sewer line. It was left rough-graded. The soil is all clay. You can imagine the devastation. This clay is nearly impossible to move. I still have to wait for the soil to settle back into the trench. What I'd like to know is the best method to finish grade the soil. Once that's done I'll have some topsoil delivered to spread over the clay and either sod or seed a new lawn. The area is about 30' by 70'. Are there services to finish grade such heavy soil?