When is it permissible to begin excavation work?

The most pertinent requirement for beginning excavation work is notifying Dig Safe. This process is essential in Massachusetts as it serves to protect utility lines and ensure the safety of the workers and surrounding area. By notifying Dig Safe, the necessary assessments are completed to mark out where underground utilities are located, which minimizes the risk of accidental strikes leading to serious accidents, service interruptions, or even legal liabilities.

Ensuring proper notifications to utility companies before starting excavation is not just a best practice; it's a legal requirement designed to safeguard everyone involved in the project. The remaining choices, while they may contribute to preparation for work, do not address the fundamental safety aspect related to underground utilities. Thus, without notifying Dig Safe, excavation could begin unsafely and potentially lead to hazardous situations.