6.3 Unified Command & Radio Communications

6.3 Unified Command & Radio Communications

Unified Command in Multi-Agency Hazmat Incidents

A hazardous materials incident often overlaps multiple jurisdictions and requires the expertise of several agencies. For example, a chemical release on a major highway requires the fire department for hazard mitigation, law enforcement for traffic control and evacuation, emergency medical services (EMS) for patient care, and environmental protection agencies for cleanup oversight. Under the Incident Command System (ICS), a Unified Command (UC) structure is established.

• Co-Located Command Post: Representatives from the key agencies sit together at a single Incident Command Post (ICP).
• Joint Decision Making: Rather than operating independently, the commanders develop a single set of Incident Action Plan (IAP) objectives.
• No Loss of Authority: Each agency maintains its own authority and responsibility. For example, the police chief still commands law enforcement personnel, and the fire chief still commands fire personnel, but their actions are coordinated under the joint objectives.
• Key Benefits: Unified Command eliminates duplication of effort, optimizes resource utilization, improves communication, and prevents inter-agency conflict or conflicting orders on the fireground.

For example, during a rail car derailment carrying chlorine gas, a conflict might arise: law enforcement may want to reopen a closed highway immediately to restore traffic flow, while the fire department needs to keep it closed to conduct atmospheric monitoring. In a Unified Command structure, these agency heads resolve the conflict face-to-face at the command post, agreeing on a single set of objectives that prioritizes public safety before reopening the roadway. Additionally, a single Public Information Officer (PIO) is appointed to speak on behalf of all agencies, ensuring that the public receives a consistent and clear message.

Furthermore, Unified Command facilitates the integration of state and federal agencies, such as the state Department of Natural Resources or the federal Environmental Protection Agency (EPA). These entities can seamlessly integrate into the planning and operations sections without disrupting the local command structure.

Radio Communication Protocols: Clear Text vs. Codes

In a multi-agency response, communication barriers can cause severe safety hazards. Historically, different agencies used "10-codes" or agency-specific signals. However, a code like "10-50" might mean "traffic accident" to the police but "officer needs assistance" to another agency. To prevent this, the National Incident Management System (NIMS) mandates the use of clear text (plain language).

• Standard Terminology: Responders must use common terms that are easily understood by all agencies.
• No Codes or Signals: The use of 10-codes, phonetic codes, or jargon is prohibited on multi-agency channels.
• Clear and Concise Messages: Transmissions should be brief, factual, and direct.

This standard of plain language ensures interoperability, allowing responders from local, state, and federal agencies to understand each other instantly, reducing transmission errors and improving overall safety.

Structured Sizing Reports (Hazmat Size-Up)

The first-arriving responder must transmit a structured size-up report to dispatch. This report is often called a "Windshield Survey" or a "CAN Report" (Conditions, Actions, Needs). It provides incoming units with critical situational awareness. Key components of the size-up report include:

1. Unit Identification and Location: "Engine 3 is on scene at the intersection of Main and 5th."
2. Container/Incident Description: "We have a single cargo tank truck, MC-307, on its side with a slow liquid leak from the rear dome."
3. Environmental Factors: "Wind is out of the north at approximately five miles per hour. The product is flowing into a nearby storm drain."
4. Initial Defensive Actions Taken: "Engine 3 is establishing Command. We are isolating the area and setting up a cold zone perimeter at 300 feet. We are staging all incoming units at Main and 10th."
5. Needs and Resources: "Requesting a hazardous materials response team and the local environmental protection agency."

Another common framework adapted for distress and critical scene reports is the LUNAR acronym:

• L - Location: Exact spot of the release or responder position.
• U - Unit: Designation of the team.
• N - Name: Identifying the responder.
• A - Assignment / Actions: Current task or defensive action.
• R - Resources: Equipment or teams needed.

Information Security in Radio Communications

Hazardous materials incidents can present significant security risks. If the incident involves a Weapon of Mass Destruction (WMD), a suspected terrorist act, or a clandestine laboratory (such as a methamphetamine lab), broadcasting details over open, unencrypted radio channels poses major threats:

• Public Panic: Broadcasting that a lethal gas is spreading toward a residential area can cause mass panic and gridlock on evacuation routes.
• Interference by Bad Actors: Terrorists or criminals may monitor radio traffic to track responder movements, plan secondary attacks, or evade law enforcement.
• Patient Privacy: Broadcasting personal patient details or medical histories violates privacy laws.

To maintain information security, responders must:

• Avoid Broadcasting Sensitive Chemical Names: Use general terms or direct incoming units to consult secure channels.
• Use Encrypted Channels: Switch to encrypted tactical radio channels for sensitive tactical discussions.
• Utilize Alternate Communication Methods: Use cell phones, secure mobile computer terminals (MDTs), or face-to-face communications for transmitting sensitive intelligence.