The Supervisors may accept, reject or modify the recommendations of the Planning Commission and, upon granting such relief, attach such conditions as they deem appropriate to any approval. Approval may be conditioned upon the grant of relief (e.g., dimensional variances, etc.) by the Zoning Hearing Board where same is required, but such conditional approval by the Supervisors shall not be binding on the Zoning Hearing Board, and the conditional approval shall be deemed vacated if any requested relief is denied by the Zoning Hearing Board.