Ya know if you have a set of concrete steps like this you need to remove you COULD use a stledge hammer. You COULD use a demo drill or a recip saw. OR you could get yourself a sweet jackhammer. I admit this was overkill. Yes when you hit the less solid bits it would fall right through.
This project was also made possible in part thanks to P90X - yes after a few hours of this - my entire upper body was just spent. This was one of the best upper body workouts I've ever experienced and would likely not have been do-able without the years of P90X/2 :)
A huge thank you to my friends at Backtrack in St. Albert for hooking me up with this bad ass machine!