(a) A person served by the post office to be closed or consolidated pursuant to the Postal Service written determination under review who desires to intervene in the proceeding, or any other interested person, or any counsel, agent, or other person authorized or recognized by the Postal Service as such interested person's representative or the representative of such interested person's recognized group, such as Postmasters, may participate in an appeal by sending written comments to the Postal Regulatory Commission in the manner described in § 3021.11.

(b) Persons may submit comments supporting or opposing a Commission order returning the entire matter to the Postal Service for further consideration. Comments must be filed in accordance with the deadlines established in §§ 3021.41 through 3021.43. Commenters may use PRC Form 61, which is available on the Commission's website, http://www.prc.gov.