In the event the department determines that additional land should be included in the proposed district, it shall forthwith set a date for a public hearing to determine whether or not such land should be included. Notice of such hearing shall be published pursuant to Section 6066 of the Government Code in each affected county in which the proposed land is to be included, and said notice shall contain time, place and purpose of such hearing, and shall describe the land so proposed to be included in the proposed district. In the event such hearing is held to consider the inclusion of additional land the department shall hear all evidence relevant to the inclusion of such additional land and the benefits to be derived by the persons or property within said land so to be included in the proposed district.