At the hearing, the board of supervisors shall have the power to exclude any unincorporated territory which, in its determination, would not receive reasonable benefit from inclusion in the district. Any landowner within any unincorporated territory proposed for inclusion may by written application request that the board of supervisors consider the exclusion of his property as described in his application from the proposed district. At the conclusion of the hearing the board of supervisors shall determine the boundaries of any unincorporated territory to be included within the proposed district and shall adopt its order calling the election on the question of the

forming of the proposed district, which election shall be consolidated with the next succeeding primary or general election occurring not sooner than 75 days following the conclusion of the hearing.