Excavation procedures can have more risk factors. Perform all the planning and work activities by undergoing proper risk assessment. Detail all dangers associated with the existing underground services and events. The risk factors vary with the type of site and project. How well-planned the excavation process is, unexpected issues like unearthing or unexpected pipelines, etc., demand a change of plan. This might require more workers as the already set plan is not prepared to face the change. So, it is always recommended to schedule and plan each activity by expecting these unexpected changes.