(1) When, in the opinion of the lead agency, a person violates or creates a substantial potential to violate this chapter, the lead agency shall notify the person of its determination by registered mail. The determination shall not constitute an appealable order or directive. Within thirty days from the receipt of notice of such determination, the person shall file with the lead agency a full report stating what steps have been and are being taken to comply with the determination of the lead agency. After the full report is filed or after the thirty days have elapsed, the lead agency may issue the order or directive as it deems appropriate under the circumstances, shall notify the person by registered mail, and shall inform the person of the process for requesting an adjudicative hearing.

(2) When it appears to the lead agency that water quality conditions or other conditions exist which require immediate action to protect human health and safety or the environment, the lead agency may issue a written order to the person or persons responsible without first issuing a notice of determination pursuant to subsection (1) of this section. An order or directive issued pursuant to this subsection shall be served by registered mail or personally upon any person to whom it is directed, and shall inform the person or persons responsible of the process for requesting an adjudicative hearing.