The Airwall
is a method for preventing the lateral migration of soil gas within the
ground by the use of a non physical barrier. The method utilises ambient
air pressurised vertically within the ground to form a barrier between
the gas source and adjacent polluted area. The air is introduced through
a series of perforated pipes arranged vertically in boreholes within
the ground and located at the perimeter of the gas source and the boreholes
are arranged so that their zones of influence overlap to give a continuous
barrier of positive pressurisation within the ground. The migrating gases
encountering the barrier are then purged from the ground by its dynamic
nature.
