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Landfill gas monitoring is the process by which gases that are released from Landfill are electronically monitored. in 1986 .Williams and Aitkenhead (1991) Lessons from Loscoe: The uncontrolled migration of landfill gas; The Quarterly Journal of Engineering Geology 24 (2), 191-207 Migrating landfill gas was allowed to build up and destroyed the property. An accident causing two deaths occurred from an explosion in a house adjacent to Skellingsted landfill in Denmark in 1991 Danish EPA . Due to the risk presented by landfill gas there is a clear need to monitor gas produced by landfills. TECHNIQUES FOR THE MONITORING OF LANDFILL GAS Surface monitoring is used to check the integrity of caps on waste and check on borehole monitoring. It may give preliminay indications of the migration of gas of-site. The typical regulatory limit of Methane is 500 Parts Per Million (ppm) by volume. Gas probes, also known as perimeter probes, are used for Subsurface monitoring and detect gas concentrations in the local environment around the probe. Sometimes multiple probes are used at different depths at a single point. Probes typically form a ring around a landfill. The distance between probes varies but rarely exceedes 300 Metres . The typical regulatory limit of Methane here is 50,000 Parts Per Million (ppm) by volume. Ambient air samplers are used to moniter the Air around a Landfill for excessive amounts of Methane and other gases. TYPES OF LANDFILL GAS MONITOR A monitor may be either a
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