40 CFR § 27.9 - Answer.
(b) In the answer, the defendant -
(1) Shall admit or deny each of the allegations of liability made in the complaint;
(c) If the defendant is unable to file an answer meeting the requirements of paragraph (b) of this section within the time provided, the defendant may, before the expiration of 30 days from service of the complaint, file with the reviewing official a general answer denying liability and requesting a hearing, and a request for an extension of time within which to file an answer meeting requirements of paragraph (b) of this section. The reviewing official shall file promptly with the hearing clerk the complaint, the general answer denying liability, and the request for an extension of time as provided in § 27.11. Upon assignment to a presiding officer, the presiding officer may, for good cause shown, grant the defendant up to 30 additional days within which to file an answer meeting the requirements of paragraph (b) of this section.