According to the specified regulations, an undermanager is required on duty under which conditions?

• A. All of the above.
• B. More than 15 people underground.
• C. Secondary extraction is occurring.
• D. Major ventilation change.

Answer: (A)

An undermanager on duty is required whenever supervision needs to be at a level beyond the usual shift arrangement due to elevated risk or changeable conditions underground. In NSW coal regulations, three situations stand out as high risk and thus require that someone with the undermanager qualifications is present:

• If there are more than 15 people underground, the workforce size itself creates a greater need for on-site oversight to manage safety and coordinate responses to any incident.

• During secondary extraction, the work involves breakage and movement of coal behind the face, introducing additional hazards such as increased strata movement and gas or dust risks that require active supervision.

• During major ventilation changes, air flows and gas concentrations can shift rapidly, altering the exposure to hazards and the potential for fumes or explosions; this also calls for an experienced supervisor to monitor and manage the transition.

Because each of these conditions independently necessitates on-site supervision by an undermanager, the correct choice encompasses all of them.