EMS spokesman Kent McKenzie said the drill, held at Camp New Hope off N.C. 86, involved more than 11 organizations, including UNC Hospitals, EMS, the Chapel Hill Fire Department and New Hope Boy Scout Troop 449.
"The overall goal is to give EMS workers practice in handling a mass casualty incident in a controlled environment," McKenzie said.
Robert Bosworth, operations chief for the Chapel Hill Fire Department, said the department sent firefighters to take part in Saturday's simulation of an exploding propane gas tank.
"Since we don't run mass casualties everyday, we had to make sure different agencies could interact together," Bosworth said.
Eagle Scout candidate Jason Dunn volunteered his troop to be victims of the explosion as part of earning his Eagle Scout badge.
Dunn said he learned organizational and management skills while preparing his troop for Saturday's mock crisis.
"The disaster shows that these things can happen, and this shows the steps in place the county has in case these events do happen," he said. "I've been going to planning meetings since July. I've been talking to my troop, e-mailing them and calling them to join the activity."
After receiving a call of mass casualties, Bosworth said a paramedic would arrive on the scene first and be established as the incident commander.
The incident commander's job is to make sure the proper resources are utilized in a hierarchical structure, he said.