I have a job that has really hard soil. Hardpan I guess you can call it. I don't know how it got that way but when I tried to plant some bushes it was like trying to go through concrete. So I had to raise the soil and plant in it as you see in the picture. Most of the soil around here is sandy with more clay about a foot or two below. In the fore ground they want sod planted, about 2 or 3 pallets worth's area that you can't see in the picture. Question, what can I do to break up the soil and make it good enough to plant sod? Thanks for any help..