D.C. Mun. Regs. tit. 14, § 3907
3907.1 There shall be no intervenors as a matter of right in RACD proceedings, but intervenors may be permitted to participate in a hearing if the proceeding will directly affect their rights or duties and is otherwise appropriate.
3907.2 A request to intervene shall be by motion stating the reasons why intervention should be permitted.
3907.3 Intervenors shall be considered full parties and shall have the same rights and duties as a party to a petition, with the following exceptions:
(a) Intervenors shall not have an independent right to a hearing; and
(b) Intervenors may participate only with respect to issues affecting them, as determined by the hearing examiner.
SOURCE: Notice of Final Rulemaking published at 33 DCR 1336, 1355 (March 7, 1986).