How many designated persons must be on duty above ground whenever personnel are underground?

Having one designated person on duty above ground whenever personnel are underground is a critical safety requirement. This designated person serves as a vital communication link and ensures that emergency procedures can be promptly initiated if necessary. Their presence helps maintain oversight of activities taking place underground and allows for immediate response in case of an emergency situation, such as an evacuation.

This practice is especially important in underground operations, where hazards can quickly escalate and communication with personnel below may be limited. The designated person is responsible for monitoring the safety conditions and can provide directions or assistance if an incident occurs, thus enhancing the overall safety management system. The one person above ground can coordinate with first responders, manage rescue operations, and ensure that proper safety measures are followed.

Requiring only one designated person strikes a balance between providing adequate supervision and maintaining operational efficiency, making it a reasonable and effective safety protocol in these environments.