Abstract: The present invention is an improved vacuum excavation system for use in the excavation of earth, waste, or other materials. A liftable and pivotable slurry or spoils tank and vacuum system are mounted on a mobile base. If required, a fluid source may be used to loosen earth or hard-packed material that may be drawn into the tank by the vacuum system. The slurry tank includes a manifold system that may receive air or other fluid to agitate the slurry or spoils to facilitate the release of solids from the tank. An exit port is provided in the tank to allow controlled release of the slurry. A valve means is utilized to allow for the use of a pump or air moving system wherein flow may be directed alternatively between the vacuum function to draw a slurry stream into the tank and a pressurizing function wherein air or other fluid is forced into the tank through the manifold system.

Abstract: The present invention is an improved vacuum excavation system for use in the excavation of earth, waste, or other materials. A slurry or spoils tank and vacuum system are mounted on a mobile base. If required, a fluid source may be used to loosen earth or hard-packed material that may be drawn into the tank by the vacuum system. The slurry tank includes a manifold system that may receive air or other fluid to agitate the slurry or spoils to facilitate the release of solids from the tank. An exit port is provided in the tank to allow controlled release of the slurry. A valve means is utilized to allow for the use of a pump or air moving system wherein flow may be directed alternatively between the vacuum function to draw a slurry stream into the tank and a pressurizing function wherein air or other fluid is forced into the tank through the manifold system.