In all proceedings where, following a notice of application and the time specified in the notice for the filing of responses thereto, the Assistant Secretary determines to have additional procedures, which may consist of the filing of supplemental written comments, written interrogatories or other discovery procedures, a conference, oral presentation, or trial-type hearing, the Assistant Secretary shall provide the parties with notice of the procedures the Assistant Secretary has determined to follow in the proceeding and advise the parties of their right to request any additional procedures in accordance with the provisions of § 590.310. The notice of procedures may identify and request comments on specific issues of fact, law, or policy relevant to the proceeding and may establish a time limit for requesting additional procedures.