An application to reduce the number of licensed sites shall be submitted to the Department no later than 10 days prior to the proposed date of reduction. The specific sites no longer required to be licensed, and either the method of disconnecting the required utilities or a description of the method of immobilizing the mobile homes shall be provided. If the reduction results in less than 5 mobile homes remaining, the license shall be void if the application is approved. No fee shall be required. The licensee shall be responsible for insuring that all utilities at vacated spaces are disconnected or sealed, as prescribed by the Department.