The law requires that you call Dig Safe any time you're going to perform an excavation. An excavation is simply movement or removal of earth, rock, or materials in the ground. In Massachusetts, the Dig Safe Law defines excavation very broadly and includes grading, backfilling, and demolition.
When you call Dig Safe and receive a ticket, Dig Safe will give you the time that you can start. Do not begin excavating until that start time. Your ticket is valid for only 30 days, so be sure to call Dig Safe and request a new ticket at least 72 business hours before your ticket expires.
If you have a contractor working for you, it is the contractor's responsibility to have a valid Dig Safe ticket. You may call Dig Safe on behalf of the contractor, but you do not have to do so.
When in doubt, call Dig Safe at 811 or (888) 344-7233. The call center is open from Monday through Friday from 6:00am to 6:00pm.