The first step in a safe and efficient excavation project is proper planning of the location and a clear understanding of the scope of the project.
While it is necessary to be specific about your areas of excavation when calling 811, excavators are encouraged to pre-mark with white paint or flags, a process called white lining, to show the specific area where excavation will take place. This will eliminate the location of underground facilities not involved in the excavation area and reduce unnecessary paint on streets, roads and sidewalks in urban areas.
For single point excavations, such as trenching, boring, etc. mark the center excavation line with dashes in white paint. Excavation width should be legibly indicated on both sides of the center line.