Reusing existing concrete slabs

We are maintaining an existing aircraft hangar floor slab and an adjacent concrete apron for reuse as an equipment parking area. It seems from what I am reading that this will not qualify for MRc3, since we are not moving the slab. It does not seem to qualify for MRc1.1 either, since the hangar building had already been demolished and all we are able to salvage is the slab. This would not account for 55% of the original building. There should be a place for us to get credit for salvaging and reusing this material, which totals over 1800 cubic yards of concrete! Is our only option MRc2?