The Commission, on testimony of an officer at a hearing that he has personally observed a person having dredging cable or dredging equipment overboard or in any way engaged in dredging in any area other than where a person holds a lawful permit or license to dredge, may revoke all permits and licenses held by the person to dredge on public or private grounds and may refuse to issue any licenses or permits for such purposes for a period of one year. Before the Commission holds a hearing pursuant to this section, it shall provide at least five days’ written notice to the permittee or licensee. Notice shall be served either by a Commission officer or by certified mail addressed to the permit or license holder at the address given on the permit or license. Any subsequent, identical notice that is sent by the Commission may be sent by regular mail.