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Ground gas and soil vapour assessment and mitigation

Event date: February 08, 2022

Missed the webinar? Watch again below.

Explaining safe development through holistic ground gas and soil vapour assessment and mitigation

Tuesday, 8 February 12.30–13.15 GMT

The public is acutely aware of the importance of protecting our environment and the effects that chemicals associated with our industrial legacy can have on human health. Recent redevelopment of brownfield land has attracted the attention of the public, pressure groups and the national press to the perceived risk from ground gas and volatile contamination. Instances of potentially unsafe developments are also well publicised. It is therefore important that risks from ground gas and vapours are appraised throughout the development cycle in order that development safety is maintained.

In response to these challenges and as science and technology advances, the practices of geoenvironmental consultants are changing. These include how we collect reliable site data, data adequacy and interpretation in support of robust site characterisation. The regular engagement of a consultant and the timely assessment of risk and mitigation measures design throughout the development process is critical to ensure safe development. Most importantly, it is critical that mitigation measures for gas and vapour are appropriate for the level of risk involved and are suitably verified to satisfy all parties that future site users will be protected.

In this webinar, we will outline some of the challenges faced by practitioners when assessing sites for gas and vapour risk. We will seek to learn from the past, will clarify the recent changes to investigation practice and will discuss how variations in the proposed development can impact initial risk assessments. We will also guide you through a holistic and cost-effective process for the management of ground gas and soil vapour risk over the development life cycle in line with good practice guidance. The aim of the webinar will be to provide developers with insights into modern data collection methods, the decision-making process and how and when such decisions require re-evaluation to ensure safe development design.

Andrew Fellows (BSc (Hons), MCIWEM, CEnv, CSci, ASoBRA) is a principal consultant based in RSK Geosciences’ Hemel Hempstead office, is the RSK Geosciences technical lead for ground gas and vapour intrusion and supports RSK clients across the UK. He is a Chartered Scientist and an accredited risk assessor with SoBRA for permanent gases, vapour intrusion, human health and controlled waters. He has over 13 years’ experience in land contamination consultancy, working for residential and commercial developers, landowners and local authorities.

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This webinar series focuses on the core elements of RSK Geosciences’ business and their applications in today’s world. The sessions will cover, for example, RSK Geosciences’ key services, highlighting how it can help to de-risk development and construction projects through reducing uncertainty on below-ground issues and identifying opportunities for cost and programme savings and sustainability gains.


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