Which of the following is needed for blasting operations?

For blasting operations, having written permission from the Director of MHST is essential because it ensures that the operation complies with safety regulations and standards. This requirement is in place to maintain a controlled environment, safeguard the health and safety of all personnel involved, and ensure that proper protocols are followed. The Director's authorization signifies that the proposed blasting activities have been reviewed and deemed safe and appropriate, reflecting a higher authority's review of the risks and procedures involved.

In contrast, while oral consent from fellow workers, a detailed project plan, and a risk assessment document are relevant components of safe blasting practices, they do not hold the same level of regulatory importance as written permission from the Director. Oral consent lacks the formal verification needed in potentially hazardous operations, a detailed project plan is an important operational tool but does not replace the need for executive authorization, and while a risk assessment is crucial for identifying and mitigating risks, it also requires official review and endorsement to move forward with blasting activities safely.