Abstract: A gas management system for collecting landfill gas (LFG) is provided, comprising a gas header pipe buried within stable ground outside of and surrounding a landfill cell, condensation discharge wells connected to the gas header pipe at predetermined low points of the gas header pipe, and containment units sealed to the liner system of a landfill cell for sealed penetration of lateral line pipes to communicate gas wells in the landfill cell to the gas header pipe. A method for collecting LFG is provided, comprising providing the system adapted for use with a landfill cell to receive LFG emitted from the landfill, collecting the gas emitted from the landfill by drawing the gas under vacuum through the system to a processing station for separating methane from LFG, and discharging condensation pooling in the reservoirs of the condensation discharge wells of the system by an automatic, pneumatic pump system.