Wow.
What is that asphalt looking pile made of? Is that pile of whatever going to be removed by some means? Gutwrenching mess of hi tech engineering left in the control of the White Rabbit junk scientists!
Probably not practical...
Apparently, water @ 100,000cfs smashed them to smithereens, returning them to their aggregate state, cement notwithstanding.
Holey Moley :-\