is a vacuuming process
by which materials contained in tanks, containers and surface impoundments are loaded by pneumatic conveyance (that is, vacuuming with controlled velocity
). The air-mover
can convey almost any material that will fit in an eight-inch hose. A few examples of the types of material frequently encountered are bricks, grease and tar, wood chips, heavy sludge found in lift stations, and sewer mains.