Final answer:
Pre-excavation marking is the act of painting the scope of work by the excavator before calling Digsafe to ensure the safety of underground utilities and structures.
Step-by-step explanation:
The act of painting the scope of work by the excavator before calling Digsafe is called pre-excavation marking. This is an important safety measure that helps ensure that underground utilities and structures are not accidentally damaged during the excavation process. Pre-excavation marking typically involves using paint or other markers to indicate the boundaries of the excavation area and identify the location of underground utilities.