Make sure you go with 4000 lb concrete and use rebar and wire under the the area the hammer will go, wire and rebar is cheap and either make it a seperate footing or cut a break around it but probably the best would be it's own footing 24" deep, poured prior to the rest of the floor and then put expansion joint around where the rest of the floor will pour up against it.
Just my opinion, I havn't too much power hammer experience but I do have a bit of experience with concrete.
welder19
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