It's an island.
Dump it off a pier.
Pile it in Central Park - build a ski slope and put in a rope tow.
Think outside the box.
The EPA put a stop to that.
It's pollution if it's been on the ground in the city. You cannot dump such hazardous waste in the ocean.
They have been doing this for 400 years in NYC. I think they probably have tried everything. Except moving to Alabama.