The materials management plan shall include an emergency release or leak response plan which describes the procedures which must be followed in response to any unauthorized discharge, spill or release of hazardous materials. Simplified emergency procedures, which include a list of who to contact should the leak detector or alarm be tripped or if an employee has reason to believe a discharge or release has occurred and what measures are to be immediately taken, shall be provided each employee at the facility and posted at conspicuous locations at the facility.