Ground Gas

Gas and groundwater level monitoring surveys are often undertaken as part of the Phase 2 contaminated land site investigation works where the Phase 1 desk study has identified a potential gas risk to a property. Gas monitoring is undertaken using a calibrated geotechnical instruments GA2000 for oxygen, carbon dioxide, methane, carbon monoxide and hydrogen sulphide. Pressure differential and gas flow rate measurements are also made and the weather and ground conditions recorded.