Could New York’s ‘black mayonnaise’ problem sink a new 82-block development?

There's a century of toxic sludge hiding in the Gowanus Canal, but it may not be enough to stop a mega-developer from building on it

In November, gigantic yellow excavators began scooping up the poisonous sludge colloquially known as black mayonnaise" from the Gowanus Canal in Brooklyn, New York - a momentous step in a prolonged cleanup effort, 10 years after the waterway's designation as a Superfund site.

But the mood is bittersweet. Longtime residents who campaigned for the Superfund label say they are now facing another environmental battle: a proposed mega-development in the neighborhood that would sit on top of a century's worth of toxic chemicals.