core drilling 12 inch holes for bollards

here in this picture we core drilled 12 inch holes for bollards for the r and L trucking company in China Grove, North Carolina. Most of the time core drilling a 12 inch hole in a floor is not overly difficult. But at this core drilling project there just happened to be an unlying concrete footer that had a bunch of rebar embedded in it. This caused the core to not want pop out of the hole freely.