Conn. Agencies Regs. § 16-50j-14
Any person who proposes to be named or admitted as a party to any proceeding pursuant to Section 4-177a of the Connecticut General Statutes may file a written petition to be so designated at least five days before the hearing. The five day filing requirement may be waived upon a showing of good cause.
The petition shall state the name and address of the petitioner. It shall state facts that demonstrate that the petitioner's legal rights, duties or privileges shall be specifically affected by the Council's decision in the proceeding pursuant to Section 4-177a of the Connecticut General Statutes. It shall state the contention of the petitioner concerning the issue of the proceeding, the relief sought by the petitioner, and the statutory or other authority therefor, and the nature of the evidence, if any, that the petitioner intends to present in the event that the petition is granted.
The Council shall consider all such petitions and shall name or admit as a party any person who is required by law to be a party and any other person whose legal rights, duties, or privileges shall be specifically affected by the Council's decision in the proceeding. Any person named or admitted as a party may decline or withdraw such status at any time upon notifying the Council in writing of his or her intent not to participate as a party.
Conn. Agencies Regs. § 16-50j-14