(a) Parties. The parties shall consist of the exemption applicant, the Federal agency responsible for the agency action in question, the Service, and intervenors whose motions to intervene have been granted.

(b) Intervenors. (1) The Administrative Law Judge shall provide an opportunity for intervention in the hearing. A motion to intervene must state the petitioner's name and address, identify its representative, if any, set forth the interest of the petitioner in the proceeding and show that the petitioner's participation would assist in the determination of the issues in question.

(2) The Administrative Law Judge shall grant leave to intervene if he determines that an intervenor's participation would contribute to the fair determination of issues. In making this determination, the Administrative Law Judge may consider whether an intervenor represents a point of view not adequately represented by a party or another intervenor.