Unless you have a prestress slab it really is not that big of a deal as far as the lift is concerned. Saw cut some squares out for the base of the lift. Dig some footings. Attach the footings to the slab via epoxied rebar. Pour footings. Should be simple enough.

On the other hand, unless your slab was poured off site and installed there may be some other serious problem going on at you building site. There is NO WAY that someone did something to pour that slab 10" off the dirt on purpose when they poured it. You may have a significant issue with settling under your building.