What was the amount of the "extra" that the contractor received for debris removal?

I don't agree with you that many engineers/architects have the experience to write a good spec on stadium/arena projects. For the most part, they are structurally repetitive entities surounded by large parking areas. From a demolition standpoint it doesn't get any better than that. You have a lot of working room and limited 3rd party liability.

Besides, it is my understanding that for the last couple of stadium/ arena jobs the specs were actually written in collaboration with a demolition contractor.