Excavation refers to the removal of soils below the grade elevation (ground level) at a project site. An excavation is usually a temporary requirement for the placement of foundation structures, utilities, and basements below grade. Considerations for excavation include the characteristics of the soil at the work location, the required depth and amount of soils to be removed, and any site constraints including adjacent structures and property lines. Depending on the height of the water table and the permeability of the soil being excavated, dewatering may be required if a dry work environment is necessary.