PUBLIC LAW 102-575—OCT. 30, 1992 106 STAT. 4753 TITLE XXXIX—SIPHON REPAIR AND REPLACEMENT (a) Congress finds that the prestressed concrete pipe siphons installed in the Hayden-Rhodes Aqueduct portion of the Central Arizona Project designed and constructed by the Secretary pursuant to the Colorado River Basin Project Act (43 U.S.C. 1501 et seq.) have been determined to be defective, inadequate and unsuitable for aquaduct purposes and must be replaced or substantial repairs completed for the transfer of the operation of the Project to its local sponsors. (b) Notwithstanding any other provision of law or contract, 50 percent of the coste incurred in the repair, modification or replacement, together with associated costs, of the Hayden-Rhodes Aqueduct siphons at Salt River, New River, Hassayampa River, Jackrabbit Wash, Centennial Wash and Aqua Fria River, all features of the Central Arizona Project, shall be borne by the United States and shall be nonreimbursable and nonretumable and the remaining costs shall be allocated to the authorized purposes of the project. TITLE XL—NATIONAL HISTORIC PRESERVATION ACT AMENDMENTS SEC. 4001. SHORT TITLE. This title may be cited as the '^^ational Historic Preservation Act Amendments of 1992". SEC. 4002. POLICY. Section 2 of the National Historic Preservation Act (16 U.S.C. 470-1) is amended as follows— (1) In paragraph (2) insert and in the administration of the national preservation program in partnership with States, Indian tribes, Native Hawaiians, and local governments" after "community of nations". (2) In paragraph (6) insert ", Indian tribes and Native Hawaiian organizations" after "local governments". SEC. 4003. REVIEW OF THREATS TO PROPERTIES. Section 101(a) of the National Historic Preservation Act (16 U.S.C. 470a(a)) is amended by adding the following new paragraph at the end thereof: "(8) The Secretary shall, at least once every 4 years, in consultation with the Council and with State Historic Preservation Officers, review significant threats to properties included in, or eligible for inclusion on, the National Register, in order to— "(A) determine the kinds of properties that may be threatened; "(B) ascertain the causes of the threats; and "(C) develop and submit to the President and Congress recommendations for appropriate action.". SEC. 4004. STATE HISTORIC PRESERVATION PROGRAMS. Section 101(b) of the National Historic Preservation Act (16 U.S.C. 470a(b)) is amended as follows: (1) Amend paragraph (2) to read as follows: "(2)(A) Periodically, but not less than every 4 years afl;er the approval of any State program under this subsection, the Secretary, in consultation with the Council on the appropriate provisions of National Historic Preservation Act Amendments of 1992. 16 USC 470 note.