Within 5 calendar days after the telephone notification of the event, the owner or operator shall provide the Department and local health department with a written report that includes, at a minimum, the information in Regulation .04 of this chapter unless the Department waives the requirement for submission of a written report due to the small volume of the overflow. The written report shall be directed to the mailing address specified by the Department. The owner or operator of the sanitary sewer system, combined sewer system, or wastewater treatment plant or a duly authorized representative shall sign any written report. A person is a duly authorized representative only if the owner or operator has signed and submitted a written authorization to the Department specifying that the person or the person holding a specified position is authorized to sign sewage overflow reports. The written authorization shall be directed to the mailing address specified by the Department.