The Secretary is authorized to complete and transmit to the appropriate non-Federal interest any study for improvements to harbors or inland harbors of the United States which were initiated prior to November 17, 1986, or, upon the request of such non-Federal interest, to terminate such study and transmit such partially completed study to the non-Federal interest. The Secretary is further authorized to complete and transmit to the appropriate non-Federal interest any study for improvement to harbors or inland harbors of the United States that is initiated pursuant to section
577 of this title or, upon request of such non-Federal interest, to terminate such study and transmit such partially completed study to the non-Federal interest. Studies under this subsection shall be completed without regard to the requirements of subsection (b) of this section.