(a) The Administrator may invite public comment or seek a response from the party at whose request the final action was taken before deciding a petition for reconsideration submitted under §211.57.

(b) The Administrator may reaffirm, modify, or revoke the final action without further proceedings and shall issue notification of his decision to the petitioner and other interested parties or publish a notice in the Federal Register. Each petition for reconsideration shall be decided not later than 4 months after receipt. Petitions for reconsideration relating to the same rule may be consolidated for decision. In the event the Administrator determines to reconsider a final action, and appropriate notice is published in the Federal Register.