For the purposes of this article, the following terms shall mean:
1. "World Trade Center rescue" shall mean any activity involving an employee of a private voluntary hospital that worked rescue operations under contract with the city of New York under direction of the fire department of the city of New York, conducted between September eleventh and September fifteenth, two thousand one inclusive at or in the vicinity of the World Trade Center site of the September eleventh, two thousand one terrorist attack on the World Trade Center in the city of New York, commonly referred to as "Ground Zero".2. "Vicinity of the World Trade Center site" shall mean anywhere below a line starting from the Hudson River and Canal Street; east on Canal Street to Pike Street; south on Pike Street to the East River; and extending to the lower tip of Manhattan.