If the department determines that all requirements of Chapter 1 of this part were complied with, the department shall forthwith hear the petition and all evidence offered in its support and in support of the written objections, and the written application of any holder of title to land included in the proposed district to have that land excluded therefrom, and the written application of any holder of title to other land already irrigated or susceptible of irrigation from the source and by the same works referred to in the petition, to have that land included in the district.