49 CFR 107.107
Application for party status.
(a) Any person eligible to apply for an exemption may apply to be made party to an application or an existing exemption, other than a manufacturing exemption.
(b) Each application filed under this section must—
(1) Be submitted in duplicate to: Associate Administrator for Hazardous Materials Safety, Research and Special Programs Administration, U.S. Department of Transportation, 400 7th Street, SW, Washington, DC 20590-0001. Attention: Exemptions, DHM-31;
(2) Identify by number the exemption application or exemption to which the applicant seeks to become a party;
(3) State the name, street and mailing addresses, and telephone number of the applicant; if the applicant is not an individual, state the name, street and mailing addresses, and telephone number of an individual designated as the applicant's agent for all purposes related to the application; and
(4) If the applicant is not a resident of the United States, provide a designation of agent for service in accordance with § 107.7.
(c) The Associate Administrator grants or denies an application for party status in the manner specified in § 107.113(e) and (f) of this subpart.
(d) A party to an exemption is subject to all terms of that exemption, including the expiration date. If a party to an exemption wishes to renew party status, the exemption renewal procedures set forth in § 107.109 apply.