This i the first one that I am doing. How deep should I put the loam so that I can figure out how much I need. Also can I put the loam right on top of the grass or should I sod cut it and then till it then put the loam down? Also I know that asking for bidding help can be bad on this site but should I just go off of what i charge a yard of spreading mulch? Thanks for all the advice and help in advance.