The acronym HGGRA stands for Hazardous Ground Gas Risk Assessment, which in turn applies to ground gas and LFG, both of which are potent enough to cause environmental harm and degradation, as well as risks to human health. You also should know that the risks from hazardous ground gas are distinctive compared to other known contaminants found in the environment, particularly water and soil contamination. The difference lies in the fact that gas is free to move in any direction, which in turn might trigger a fire, explosion, and asphyxiating environment. No human being wants to be inside a situation where there is hazardous gas.
Meanwhile, LFG is made up of carbon dioxide, methane, and several volatile organic compounds and trace gases produced by microbes during anaerobic decomposition of the organic waste in a landfill. The usual scenario is that in a landfill area, the gases naturally migrate from the waste mass to the buildings nearby as well as other receptors. The reason for this migration is the constant changes in pressure in the atmosphere or because of gaseous diffusion. If there is no preventative measure, the process will eventually create an environment or condition that could lead to an explosion or asphyxiating atmosphere. Likewise, the situation will hurt vegetative growth.
When it comes to hazardous ground gas, the risks involve are mostly a result of the volatility of the substance when it is in its liquid phase. If you are wondering how gas transforms into liquid; well, the answer is when something happens like a hydrocarbon leak in an underground storage container. The gas phase compounds that come from hydrocarbons and solvents, on the other hand, tend to react in the same manner and may even have the same consequences to that of LFG. The difference though is the fact that there is a higher risk to human health compared to LFG. Be aware that the assessment and management of the risks will differ to that of LFG, although there is no denying that they share the same principals.
The field of gas risk assessment is a specialised one, and only an experienced and highly skilled individual must undertake it. Anyone who does not have proof of training cannot conduct or perform the assessment. There have been countless instances of those who tried HGG and LFG risk assessments and miserably failed in them. It is crucial to acknowledge that ground gases, as well as LFG, have distinctive characteristics, but both come with a higher risk profile compared to other types of contamination. It is therefore imperative that a skilled and highly trained individual must handle the assessment and no one else.