My back yard has quit a few bumps and dips since I had a drain field replaced 3 years ago. I was wanting to know the best way and about what kind of dollars it would cost me to smooth it out. The area is about 13,000 sq/ft and is roughly square in shape. The yard is bermuda and has clay soil. I live in Loganville, which is about 30 miles east of Atlanta, if that matters.