; and (2) any amendments to the agreement necessary to make the agreement consistent with this Act. (c) Authority of Secretary The Secretary may carry out any action that the Secretary determines is necessary or appropriate to implement the agreement and this Act. (d) Environmental compliance (1) Environmental compliance The Secretary shall comply with all aspects of the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq.), the Endangered Species Act of 1973 ( 16 U.S.C. 1531 et seq.), and other applicable Federal environmental laws and regulations. (2) Execution of the Agreement Execution of the agreement by the Secretary as provided for in this Act shall not constitute a major Federal action under the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq.). (3) Lead agency Reclamation, or any United States or Navajo Nation agency with an intergovernmental agreement with the Secretary pursuant to subsection (a) of section 6, is authorized to be designated as the lead or joint lead agency with respect to environmental compliance for the Navajo water development projects. 6. Authorization for construction of Navajo water development projects (a) In general The Secretary, acting through the Commissioner of Reclamation, shall plan, design, and construct the water diversion, delivery, and conservation features of the Navajo water development projects. The Secretary is authorized to enter into intergovernmental agreements with other United States, State, or Navajo Nation agencies as necessary or appropriate to implement this section. (b) Lead agency Reclamation, or any Federal or Navajo Nation agency with an intergovernmental agreement with the Secretary pursuant to subsection (a), is authorized to serve as the lead agency or joint lead agencies with respect to any activity to plan, design, and construct the water diversion, delivery, and conservation features of any Navajo water development project to be constructed by that agency. (c) Scope The agreement and this Act contemplate a