At the core of the ASTI One Plan are the four command positions that you see below. Each position is uniquely critical to the direct outcome of an incident and each role has specific assigned duties that fit a logical role.

The core concept of the four command positions was derived from the Incident Command System (ICS) that is primarily used by firefighters, police officers, schools, hospitals, and more.responders how to prevent and respond to ammonia leaks.


The first supervisor on the scene must take charge and transition command as the incoming Command Team is engaged. The person in charge must announce the command and position at a Command Post where he/she will be available to meet with in-coming responders and manage safety and the Action Plan according to the level of training.

  • Take command via radio communication to the Command Team members.
  • Make sure that notifications are made for emergency support: fire, medical, rescue, systems control (contractor).

Plant IC duties:

  • define the problem, assure scene safety, provide safe refuge for employees and visitors, and manage the escape to safe refuge for those trapped within the Isolation Zone.
  • Assure that emergency shut-down procedures are implemented safely. The safety protocols and expertise of the Lead Responder should be pre-arranged as a key element of on-going readiness. Assure that evacuation, safe refuge, and personnel accountability is managed in accordance with the Emergency Plan.
  • Provide a “Conditions – Actions – Needs” report to the first-due fire responders and contractors.


  • Oversee movement of personnel, safe refuge and care of those moved outside of the Isolation Zone.
  • Judge and monitor wind direction and chemical plume
  • Initiate an appropriate personnel movement plan.

An Access Control leader may be assigned by the Plant IC to work for the Evacuation Group Supervisor to assure that incoming emergency responders are guided to the Command Post while others not involved in the emergency are kept away from the Isolation Zone.


Communicates size-up details (who, what, and where of the incident) to the Plant IC. The Lead Responder and his/her team will oversee the life safety threats and the emergency shut-down procedures implemented within the Isolation Zone. The actions performed must be in a NON-Dangerous environment unless the Entry Team includes trained hazmat Technicians who are in proper PPE to engage an offensive Action Plan. Use pre-defined Hazard Zone locations that have special challenges associated with emergency shut-down.Quickly assess any rescue, medical, decontamination, and triage needs and begin operations to initiate rescue operations until further support arrives from public safety. Pre-define emergency shut-down procedures, containment and control options, and coordinated ventilation operations.


Takes charge of notifications, manages call-in and call-out, documents the key times and actions associated with the incident, has a team approach that allows for support inside as well as at the Incident Command Post. The Notification Unit Leader assists the Plant IC by documenting activities, listening for radio requests, and preparing a Situation Status Report.

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About ASTI

Established in 1987, the Ammonia Safety & Training Institute (ASTI) is a 501(c)(3) organization dedicated to making ammonia (NH3) the safest managed hazardous material in the world. Bringing together leaders from industry and public safety organizations with hundreds of years of combined experience, ASTI provides safety management support through effective use of Prevention, Mitigation, Preparedness, Response and Recovery (PMPRR) training. All courses meet OSHA standards.