33 CFR §148.240

1. (a)Any person or Adjacent Coastal State may intervene in a formal hearing.
2. (b)A person must file a petition of intervention within 10 days of notice that the formal hearing is issued. The petition must:
   1. (1)Be addressed to the Administrative Law Judge (ALJ) Docketing Center;
   2. (2)Identify the issues and the petitioner's interest in those issues; and
   3. (3)Designate the name and address of a person who can be served if the petition is granted.
3. (c)An adjacent coastal State need only file a notice of intervention with the ALJ Docketing Center.
4. (d)The ALJ has the authority to limit the scope and period of intervention during the proceeding.
5. (e)If the ALJ denies a petition of intervention, the petitioner may file a notice of appeal with the ALJ Docketing Center within 7 days of the denial.
   1. (1)A brief may be submitted with the notice of appeal.
   2. (2)Parties who wish to file a brief in support of or against the notice of appeal may do so within 7 days of filing the notice.
6. (f)The Commandant (CG-5P) will rule on the appeal. The ALJ does not have to delay the proceedings for intervention appeals.