Which action is the VO authorized regarding gas alarm levels?

• A. Installing new lighting
• B. Moving office furniture
• C. Changing gas alarm levels
• D. Replacing diesel engines

Answer: (C)

Gas alarm levels are part of how a mine manages gas risk through ventilation controls. The ventilation officer is responsible for gas management, which includes setting and adjusting the thresholds that trigger alarms and the corresponding responses. Because changing these alarm levels directly affects safety procedures, the VO is the person authorized to make such changes, after considering current gas readings, ventilation design, and regulatory requirements, and ensuring proper testing and communication of any adjustments.

Other activities like installing lighting, moving office furniture, or replacing diesel engines don't pertain to gas alarm thresholds or the safety controls tied to gas management, so they fall outside the VO’s authority on gas alarm levels.