Abstract: A wellhead assembly provides a connection between a protruding wellhead pipe of a landfill and piping that leads to treatment, disposal, or recovery equipment, or the like. The wellhead assembly includes a first substantially hollow cylindrical member that has a first open end, a second closed end, and a receiving cavity therein. The closed end has an aperture through it that is smaller in diameter than the diameter of the protruding wellhead pipe, and the first substantially hollow cylindrical member is capable of slidably receiving the protruding wellhead pipe within the receiving cavity. The wellhead assembly also includes a second substantially hollow cylindrical member having a first open end and a second closed end. The first open end is coupled to the second closed end of the first substantially hollow cylindrical member, and is positioned so as to surround and enclose the aperture in the first substantially hollow cylindrical member.

Abstract: A dual containment valve is provided for use in conjunction with dual containment pipes. The dual containment valve includes an inner casing for fluid transport having a first open end, a second open end, a fluid passageway extending therebetween along its longitudinal axis, and an inner casing aperture therein; and an outer casing for leakage protection having a first open end, a second open end, an axial hole extending therebetween along its longitudinal axis, and an outer casing aperture therein. The inner casing is positioned within the axial hole in the outer casing so that the longitudinal axes of both are substantially aligned. The dual containment valve further includes a valve assembly for controlling the flow of fluid within the fluid passageway in the inner casing.