If you want to grind that stump below ground level, we can coordinate that. If you are going to pour a slab, we will go down about 6 inches so that the contractor can pour the usual 4-inch slab. We can go deeper when necessary.
If your stump is out in the open yard, you may want to just go two or three inches below the surface. With a little top soil and a few pads of grass, you won’t be able to tell that a tree used to be there.