Any person who knowingly violates any provision of this chapter or of any permit or regulation issued thereunder shall, upon conviction, be fined not more than $20,000 for such violation, or imprisoned for not more than one year, or both.

Any person who violates any provision of this chapter or any regulation or permit issued hereunder may be assessed a civil penalty by the Secretary of not more than $10,000 for each such violation. No penalty shall be assessed unless such person is given notice and opportunity for a hearing with respect to such violation. Hearings held during proceedings for the assessment of civil penalties authorized by this subsection shall be conducted in accordance with