(d) Based solely on his or her discretion, the Secretary will determine whether to grant such a waiver or reduction. Pursuant to the procedure described in
§ 2570.83(b), the petitioner will be served with a written determination informing him or her of the Secretary's decision. Such written determination shall briefly state the grounds for the Secretary's decision, and shall be final and non-reviewable. In the case of a determination not to waive, the payment period for the penalty in question, if previously initiated, will resume as of the date of service of the Secretary's written determination.