(1) Unless otherwise provided in the Notice, except in situations covered by paragraph (a)(2) of this section, civil penalties assessed pursuant to this subpart are due and payable 60 days after the Notice is served upon the respondent.

(2) If the respondent both requests a hearing and serves an answer, civil penalties assessed pursuant to this subpart are due and payable 60 days after an order to pay, issued after the hearing or upon default, is served upon the respondent, unless the order provides for a different period of payment. Civil penalties assessed pursuant to an order to pay issued upon consent are due and payable within the time specified therein.