10th Cir. R. 15.4: Intervention
Tenth Circuit Rules — Title IV. Review or Enforcement of an Order of an Administrative Agency, Board, Commission, or Officer
(A) Notice of Intervention by a party. A party to an agency proceeding may intervene in a review of that proceeding by filing a notice of intervention in the court. The notice must state whether the party wishes to intervene as a petitioner in opposition to the agency order or as a respondent in support of the order.
(B) Motion to intervene.
(1) Content. In addition to the requirements of Federal Rule of Appellate Procedure 15(d), a nonparty motion must state the reasons why the parties cannot adequately protect the interest asserted.
(2) Opposition. Opposition to a motion to intervene must be filed within 14 days after the motion is served.