Such permits may be issued for a period not to exceed one year and, on further application to the board of adjustment, may be extended, for good cause shown, for an additional period not to exceed one year. Thereafter, such temporary use permit shall expire and the use so permitted shall be abated. Any structures erected in connection therewith shall be removed. Where it deems appropriate, the board of adjustment may require such guarantees it deems sufficient to cause such abatement and/or removal.