A homeless man has come forward with two sets of confidential Ground Zero blueprints that he said were dumped in a Lower Manhattan trash can.

The man brought the Freedom Tower plans to the New York Post, which reported that the 150-page schematic is marked: "Secure Document — Confidential."

The documents are dated Oct. 5, 2007. They contain plans for each floor, the thickness of the concrete-core wall, and the location of air ducts, elevators, electrical systems and support columns.

The agency that owns the World Trade Center site, the Port Authority of New York and New Jersey, called it a serious security lapse.

Candace McAdams, a spokeswoman for the Port Authority, said mishandling the blueprints would be "cause for serious disciplinary action — up to termination for employees and breach of contract and legal action for contractors."

The plans are not detailed, and have been updated several times since October, McAdams said.

Read more in the New York Post.