I am getting ready to pour a concrete foundation for a grain bin. I had a dozer root out one good size and two small maple trees. Got all of the roots out and left a good size hole under half of where the concrete pad will go. The hole is probably up to 1.5 to 2 feet below grade in places. I said I was going to go to the quary and get fill which is waste lime/limestone and layer/pack it into the hole. I have used waste lime before to level up grain bin sites. The contractor/dozer operator said the dirt was so dry that it would pack as well the lime. We are in a flash drought in Eastern Iowa. Is that the case with dry dirt? Can I layer the dry dirt in and pack it with the skid loader or should I stay with the waste lime? I don't want any uneven settlement. Any opinions? Thank you.