(a) Notice to the Department. A Tribe must submit a written notice of its intent to retrocede to the Self-Governance Official to ttsgp@dot.gov or by any other method that provides receipt. The notice must specifically identify those PSFAs the Tribe intends to retrocede.

(b) Notice to the Department of the Interior. The Department will send the Tribe's notice of its intention to retrocede to the Department of the Interior and request that the Department of the Interior determine whether the PSFA is associated with transportation services provided by the Department of the Interior.