; and (2) if the Secretary determines that the proposed modifications are consistent with the authorized purposes of the project and the study meets the same legal and regulatory requirements of a Post Authorization Change Report that would be otherwise undertaken by the Secretary, submit to Congress the study for authorization of the modification. 216. Studies for modification of project purposes in the Colorado River Basin in Arizona (a) Study The Secretary shall carry out a study of a project of the Corps of Engineers in the Colorado River Basin in the State of Arizona to determine whether to include water supply as a project purpose of that project if a request for such a study to modify the project purpose is made to the Secretary by— (1) the non-Federal interest for the project