Underpinning is a process used to shore-up or level structures through the use of steel pipe being set under structural foundations. In order to create and access these subsurface work areas, vacuum excavation processes are used to clear the soil. It is also used in support of trench shoring that add strength and safety to trench walls. Vacuum excavation has proven to be the most efficient and safest process. Further, it does not damage any other areas of a property or structure.