If the Administrator finds that any of the provisions of this chapter are being violated, he shall notify, in writing, by registered or certified mail, the person(s) responsible indicating the nature of the violation and ordering the action necessary to correct the violation. Whenever a person shall have been notified in writing that he is in violation of the provisions of this chapter, such person shall commence correction of all violations within 10 days of notice and shall correct all violations within 45 days of notice. If such corrections are not commenced within 10 days of written notice or not corrected with 45 days of written notice, each day that a violation continues shall be considered a separate offense.