Reference— Any reference in any law to a wage requirement of subchapter IV of chapter 31 of title 40, United States Code, shall after the date of the enactment of this Act be null and void.
3.
Effective date and limitation
The amendment made by section 2 shall take effect 30 days after the date of the enactment of this Act but shall not affect any contract in existence on such date of enactment or made pursuant to invitation for bids outstanding on such date of enactment.