(a) The board may enter an order of temporary exclusion of territory if, on hearing the petition for exclusion, the board finds that:
(1) the territory will not be benefited by the further improvements planned by the district; and
(2) the benefits accorded to the territory to be excluded by improvements previously authorized by the district do not have a proportionate relationship to the benefits received by the remainder of the district.
(b) An exclusion of territory does not become effective until ratified at an election under Section 9018.057.