Ground-Gas Risk Assessment

Reduction of ground gas risks, discharge of planning conditions and successful completion and sign-off of developments


Risk Assessment

GGS provides ground-gas risk assessment to identify and quantify ground gas risk to specified receptors. Increased Risk Prediction is achieved by interpreting high density data sets provided by the GGS GasSentinel®. Correctly analysing and interpreting continuous data gives higher confidence that the correct risk classifications have been reached. Multiple high frequency data sets, including ground-gas concentration, atmospheric pressure, temperature and ground water level are analysed, which can be used to draw correlations and identify potential ground gas driving mechanisms.


GGS makes use of its specialised analytical tools in ground gas risk assessment, such as ground-gas flux calculation from GGS Purge & Recovery Tests and concentration duration analysis. These tools are essential in calculating the actual ground gas risk, so that ground gas protection measures can be designed and targeted correctly. Less conservatism built into ground gas protection measures saves our clients’ money.




In the context of the Model Procedures for the Management of Land Contamination (CLR11) remediation options should be identified for each relevant pollutant linkage identified at a site. i.e. those pollutant linkages that have been identified through the process of risk assessment to be causing or having the potential to cause harm.


The remedial options available to manage unacceptable risks are:

  • Manage (remove, modify) the source
  • Interrupt the pathway
  • Modify the receptor or the behaviour of the receptor


Choosing the appropriate remediation (and subsequent validation) can lead to reduction in risk from ground gas hazards, discharge of planning conditions and successful completion and sign-off of developments. The approach will also ensure that the ground gas contamination is dealt with in a appropriate and cost effective manner.

GGS has strong relationships with a wide network of ground gas remediation contractors and service providers, whilst maintaining a position as an independent consultant. This independence affords the flexibility to deliver greater assurance in the decision-making process.


Take a look at our gas monitoring data and service packages here.