Abstract: An improved pressure relieving valve assembly is disclosed, together with an inflatable support assembly incorporating the pressure relieving valve assembly. The pressure relieving assembly comprises a valve body having a valve inlet and a valve outlet, and a valve chamber fluidly coupled with the valve inlet and the valve outlet. A plunger is disposed within the chamber and arranged to move within the valve chamber to selectively open and close a passageway through the chamber between the valve inlet and the valve outlet. Embodiments are disclosed in which the assembly further comprises audible and/or visual indicators for indicating whether the passageway is open or closed, for assisting a user when inflating an inflatable support member to an optimum pressure.

Abstract: A method and apparatus for removing volatile contaminants from the phreatic zone of contaminated ground. The apparatus is a system comprised of at least one air injection well and at least two pressure relief wells arranged in a line. Air is injected into the contaminated ground water to allow sparging of the volatile contaminants from a linear region between injection and relief wells. The volatile contaminants are captured by the injected air and carried to the extraction line for removal and treatment.