Prior to any public hearing held by the supervisor pursuant to this chapter, the supervisor shall give reasonable written notice of the hearing to all persons shown by the records of the tax assessor to have an interest in the land proposed for unit operation, and shall give written notice to any city within which the land lies and, with respect to land which lies in an unincorporated area, to the county in which the land lies. Such city or county or any other interested person may, on any matter relevant to the proposed agreement for operation, submit testimony and evidence for the consideration of the supervisor.