40 CFR § 72.64
Statement of basis
June 9, 2020
(a) The statement of basis will briefly set forth significant factual, legal, and policy considerations on which the Administrator relied in issuing or denying the draft permit.
(b) The statement of basis will include:
(1) The reasons, and supporting authority, for approval or disapproval of any compliance options requested in the permit application, including references to applicable statutory or regulatory provisions and to the administrative record; and
(2) The name, address, and telephone, and facsimile numbers of the EPA office processing the issuance or denial of the draft permit.