Sec. 303.731 (e) (2)

(2) The Secretary of the Interior must provide a summary of this information (including confirmation that each tribe, tribal organization, or consortium has provided to the Secretary of the Interior the assurance required under paragraph (e)(1) of this section) on a biennial basis to the Secretary along with such other information as required of the Secretary of the Interior under part C of the Act. The Secretary may require additional information from the Secretary of the Interior.