CL:AIRE technical bulletin written by GGS on continuous ground gas monitoring is published

31Jan / 2019

CL:AIRE technical bulletin written by GGS on continuous ground gas monitoring is published

A CL:AIRE technical bulletin written by GGS, based on a decade of continuous ground gas monitoring experience, has been published today.

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A CL:AIRE technical bulletin written by GGS, based on a decade of continuous ground gas monitoring experience, has been published today.

Continuous Ground Gas Monitoring and the Lines of Evidence Approach to Risk Assessment”, written by Simon Talbot, engineering geologist and Managing Director of GGS, evaluates over ten years of continuous ground gas monitoring experience. It considers the extent to which the technique has provided a greater understanding of ground gas behaviour, hazards and appropriate protection measures for both existing and new developments.

The bulletin identifies some of the commonly experienced relationships between gas concentrations, flow and the environmental driving mechanisms that move gas through the ground. Drawing on a wealth of existing guidance, it provides examples of the additional tools that can be used to build the lines of evidence approach to risk assessment, including techniques such as concentration duration curves and differential pressure assessment.

The CL:AIRE technical bulletin also discusses the dissolved gas phase and the effect of different gas solubilities in affected gas concentration and flow readings. Importantly the document highlights the effect of the monitoring well itself – an artificial gas collection chamber – on ground gas monitoring results.

Simon Talbot is the former Director of the Greater Manchester Geological Unit, which in partnership with the University of Manchester, led a Department of Industry funded research project which resulted in the creation of the GasClam in 2009.

Simon had this to say about publishing a new CL:AIRE bulletin ten years on from this achievement; “Continuous ground gas monitoring has evolved from an esoteric research project to a widely adopted mainstream technique with multiple different instruments commercially available.  I hope that this informed and insightful paper will assist in improving standards in the contaminated land sector and help focus limited resources on those sites that need high quality gas protection measures. Continuous monitoring can help reduce the incidence of poor quality and over-conservative risk assessments that waste developer’s time and money”.

 

To download TB 18 “Continuous Ground Gas Monitoring and the Lines of Evidence Approach to Risk Assessment”, click here.

To join the new webinar series based on this new CL:AIRE technical bulletin, click here.