When the commissioner finds, upon investigation, that any provisions of this part are not being carried out, and that effective measures are not being taken to comply with this part, the commissioner may issue an order for correction to the responsible person, and this order shall be complied with within the time limit specified in the order. Such order shall be made by personal service or shall be sent by registered mail. Investigations made in accordance with this section may be made on the initiative of the commissioner. Prior to the issuance of any order or the execution of any other enforcement action, the commissioner may request the presence of an alleged violator of this part at a meeting of the staff of the division of solid waste management to show cause why enforcement action ought not to be taken by the department.