; or (B) the provision of law from which the program included in the plan derives its authority that is specifically applicable to Indians. (e) Decision on waiver request (1) In general Not later than 90 days after the head of an affected agency receives a waiver request, the head of the affected agency shall decide whether to grant or deny the request. (2) Denial of request If the head of the affected agency denies a waiver request, not later than 30 days after the date on which the denial is made, the head of the affected agency shall provide the requesting Indian tribe and the Secretary with written notice of the denial and the reasons for the denial. (3) Failure to Act on request If the head of an affected agency does not make a decision under paragraph (1) by the deadline identified in that paragraph, the request shall be considered to be granted. (f) Secretarial review If the head of an affected agency denies a waiver request under subsection (e)(2), not later than 30 days after the date on which the request is denied, the Secretary shall review the denial and determine whether granting the waiver— (1) will be inconsistent with the provisions of this Act; or (2) will prevent the affected agency from fulfilling the obligations of the affected agency under this Act. (g) Interagency dispute resolution (1) In general Not later than 30 days after the date on which the Secretary determines that granting the waiver will not be inconsistent with the provisions of this Act and will not prevent the affected agency from fulfilling the obligations of the affected agency under this Act, the Secretary shall establish and initiate an interagency dispute resolution process involving— (A) the Secretary; (B) the participating Indian tribe