How can an entire city be bulldozed and declared a hazardous waste site?

Question

How can an entire city be bulldozed and declared a hazardous waste site?

Answer 1

Easy...Have a dirty bomb explode in the area or have a biological weapon be released or have some sort of chemical spill in the whole area to include the ground water that is killing the residents.

Answer 2

ask the folk who lived in Love Canal, NY it was built on a hazardous waste dump, the materials which were put there before we knew they were hazardous.