My wife and I have recently had some work done in our backyard getting a construction dump pit excavated and the backyard graded to a slight hill. We had a large portion of the yard sodded and since we had this done back in March the parts of the yard that stay pretty shady are wet like a marsh and much of the sod has died in those areas. It's stayed wet enough in some areas that you sink into the ground a couple of inches when you walk out on it. What could we do to firm up the yard, and is this something that should be covered by the company that did the work? Any advise would be appreciated.