I've been called to lay new sod in the front of a customers home. They have had it done twice in the last few years (not by me). The problem I have seen is that the top inch of soil is very sandy. Under that is very hard clay. I think that the top inch is the top soil that was spread out the last time the sod was put in...but not curtain. How can I be sure that when I put sod there it will take?? I thought of taking out about 4" of clay and adding top soil...what do you think??????