<span>Do not enter an unprotected ditches! ditches 5 feet (1.5 meters) deep or greater require a protective system unless the excavation is made entirely in stable rock. ditches 20 feet (6.1 meters) deep or greater require that the protective system be de-signed by a registered professional engineer or be based on tabulated data prepared and/ or approved by a registered professional engineer.</span>
The owners of the land and property there must give the government permission before they can build anything there. If the government builds there anyway it is a violation of the owner's rights. This would mean they could sue them. <span />