What is the correct action if hazardous gas is detected in an excavation?

When hazardous gas is detected in an excavation, the most appropriate action is to evacuate the area immediately. This is crucial for ensuring the safety of all personnel involved. Hazardous gases can pose serious health risks, including asphyxiation, respiratory problems, and even explosion hazards. Evacuating prevents potential exposure and allows for a safe distance to be established.

While informing a supervisor is an important step that typically follows evacuation, the immediate priority must be the safety of the workers in the vicinity. Additionally, waiting for further instructions or continuing work, even with caution, can lead to dangerous situations where individuals may be put at risk. Proper protocols dictate that in the presence of hazardous gases, swift evacuation is essential to manage and mitigate any potential danger effectively.