When an application for a permit or amendment is denied, no application for the same or substantially same permit or amendment shall be filed in whole, or in part, for the ensuing 12 months except as otherwise specified at the time of denial. The Director shall determine whether the new application is for a permit or amendment which is the same or substantially the same as a previously denied permit or amendment. No decision of the Director shall be effective until a period of 15 days has elapsed following the written notice of decision.