Completed in just two days, excavation for the River House foundation is now done. The time lapse video above compresses the entire process into just over a minute. The perimeter of the excavated area is four feet outside of where the foundation walls will be poured. This is to allow space for workers to place forms, install drainage tile, and waterproof the outside of the walls. The depth is set to reach virgin (undisturbed) soil and to accommodate roughly 20 inches of insulating substrate.