20 C.F.R. § 726.306 Finality of administrative assessment.
Title 20 - Employees' Benefits
Except as provided in §726.307(c), if any person identified as potentially liable for the assessment does not, within 30 days after receipt of notice, contest the assessment, the Director's assessment shall be deemed final as to that person, and collection and recovery of the penalty may be instituted pursuant to §726.320.
Title 20: Employees' Benefits
PART 726—BLACK LUNG BENEFITS; REQUIREMENTS FOR COAL MINE OPERATOR'S INSURANCE
Subpart D—Civil Money Penalties
§ 726.306 Finality of administrative assessment.
