The Chief of Police, upon receipt of an application and any necessary fees agreement, shall within five (5) days submit said application to the Mayor with a recommendation as to whether or not the anticipated use should be permitted and an estimate as to the amount of potential cleanup expense or the amount necessary to repair potential damage to public property. The Mayor shall thereafter either grant or deny said permit, or grant said permit conditioned upon the applicant furnishing to the City a bond in an amount reasonably calculated to offset potential cleanup expense or to repair potential damage to public property resulting from the anticipated use. Such permit, however, shall grant the use requested for a temporary period of not more than thirty (30) days. A letter shall be delivered to the applicant to serve as the permit, or in the event of refusal of the permit, to notify the applicant of such refusal. In the event of refusal by the Mayor, reasons therefor shall be plainly set forth in the letter.