I have a customer who has a real rough and bumpy yard...it is one big square, no hills, just really uneven. She wants it leveled out and she has a sprinkler system. Is there anything I can use to mash the ground down without damaging the sprinklers, or do I need to grate the whole yard or can I just put dirt all over it and keep mashing it down until it's level? Any suggestions would be greatly appreciated!!! I don't know??