A half-century later, officials are taking significant steps toward a $62 million cleanup of one of the nation’s worst hazardous waste dumps, a sludge-like mess that’s lurked underground around a Pembroke Park property. A half-century later, officials are taking significant steps toward a $62 million cleanup of one of the nation’s worst hazardous waste dumps, a sludge-like mess that’s lurked underground around a Pembroke Park property. Environment Phys.org – latest science and technology news stories