What is the correct sequence of actions when methane is detected above the allowable level?

• A. Stop work, evacuate to a safe location, notify supervisor, implement ventilation or other controls
• B. Increase ventilation without stopping work
• C. Continue work and monitor gas
• D. Document reading and continue

Answer: (A)

When methane levels exceed what’s allowed, the top priority is to remove people from danger and prevent ignition. Stop all work immediately and evacuate to a safe location away from the gas and any potential ignition sources. This immediate action reduces exposure and the risk of an explosion. Then notify a supervisor so the incident can be managed and proper safety procedures can be followed. After alerting leadership, implement ventilation or other controls to dilute and remove the gas from the area and to secure the space so it can be brought back to a safe atmosphere. Only once the atmosphere has been tested and confirmed safe should work resume under the appropriate safety procedures.

Choosing to continue working, to just increase ventilation while work continues, or to document the reading and carry on without taking action all fail to address the immediate hazard. They either expose people to danger or waste time while the environment remains unsafe.