It would depend on your soil type, If it's good drainage soil you could remove 8 12" of soil and put in 18 to 24" of Inch-minus without binder. The pad would need to be made 4 to 6 feet larger all around then the size of the slab. The only substitute for compaction with a machine that I know of would be make the pad, put a sprinkler system on it for a few weeks and then let it sit for a yr.

If your soil doesn't drain well, I would remove 18 to 24" of soil and replace it with 2" stone with drain swales at two Conner's on the down sloping side. Then place the 18 to 24" of Inch-minus without binder on top of that and make the pad a minimum of 10' larger than the size of the slab.

David

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