About this conference

Building on the success of previous ground gas conferences, this is the go-to event for regulators, consultants, remediation contractors and other industry experts concerned with all aspects of ground gas risk assessment, verification, and protection.

This year's conference will provide a varied mix of new research, policy updates, practical insights and topical case studies on issues including:

  • Recent updates to ground gas guidance and best practice

  • Innovations in ground gas monitoring and risk assessment, especially on more complex sites

  • Retrofitting ground gas protection measures

  • Effectively evaluating soil vapour intrusion

  • Optimising the use of continuous monitoring and environmental data

View the conference programme below.

To download a PDF of the programme click here.

Brownfield Summit 2021


Ground Gas

9-10 March

Ground Gas Programme

New Guidance & Practical Solutions for Improved Risk Assessment, Mitigation, & Protection Verification

Afternoon: Tuesday 9 March

13.30 Welcome and Introduction

13.35 Opening Remarks from the Chair

Hugh Mallett, Technical Director, BuroHappold

13.45 Detailing the New Gas Protection Verification Accreditation Scheme (GPVS)

CL:AIRE has recently announced the launch of the Gas Protection Verification Accreditation Scheme (GPVS). This scheme has been developed working closely with industry, with the aim of raising standards in gas membrane inspection, verification, and reporting, ensure that the gas protection verification part of land contamination management meets the necessary technical and regulatory standards, and to provide all stakeholders involved in land contamination management with the confidence that risks associated with ground gases have been adequately managed.

The scheme applies to both the practical installation of the gas mitigation measures and to the verification reporting process. This presentation will outline the key features of the scheme and how it will work in practice.

Nicola Harries, Project Director, CL:AIRE

14.10 Retrofitting Ground Gas Protection Measures to Existing Buildings

  • Reviewing the key factors influencing a retrofit decision and the appropriate options appraisal process

  • Detailing the key recommendations of new CIRIA guidance 

  • Recent case example - lessons to be learnt: the importance of a thorough risk assessment and CSM


Steve Wilson, Technical Director, The Environmental Protection Group Ltd (EPG)



15.15 Innovative and Proven Methods to Refine your Vapour Intrusion Conceptual Site Model (CSM)

The ability to accurately assess the location, and vapour intrusion (VI) potential of VOC sources beneath buildings is vital in developing an effective conceptual site model (CSM).  An innovative and proven method has significantly streamlined and improved the assessment process. Through these new advances, it is possible to complete a thorough and accurate assessment of sub-slab vapour conditions in less time and at a lower cost.  Information generated by an accurate assessment can then be leveraged using GIS to increase the understanding of a VOC source’s age and the potential release mechanism, and thus better define your CSM.

This discussion presents case studies of large manufacturing facilities (up to 22,000 m2) that had been active as early as 1880. At least one had a long-documented history of chlorinated solvent use. In each case, the use of high quality, rapidly obtained, active sub-slab soil gas measurements obtained from narrowly spaced grid systems provided information necessary to locate VOC sources and better define your CSM Model.

Laurie Chilcote, Vice President, Vapor Pin Enterprises & Director of Sales & Marketing, Cox-Colvin & Associates


15.35 Case Study on Vapour Intrusion: Indoor Air Quality – Could Your Concrete Floor be Causing Harm?

Whilst most people will be familiar with the term Sick Building Syndrome, little attention is paid in the UK to the presence of 2-ethylhexanol (2-EH) in indoor air, and its prominence in causing sickness in both residential and commercial settings. 2-EH, which is highly toxic by inhalation, is readily formed by the reaction between high moisture content concrete floors and specific chemicals present in some vinyl flooring and adhesives.  

This presentation highlights the investigation and technical aspects of this little-known issue recently identified and remediated during a vapour intrusion investigation of a residential property in the UK. 

Dr John Andrews, Associate, The Environmental Protection Group (EPG)

Melanie Lipsham, Geoenvironmental Engineer, LEAP Environmental

15.55 Q&A

16.15 Close of Session

Afternoon: Wednesday 10 March

13.30 Welcome Back

13.35 Opening Remarks from the Chair

Hugh Mallett, Technical Director, BuroHappold

13.45 Updated Good Practice Guidance on Mine Gas Risk Assessment

Following the recommendations arising from the Gorebridge incident, a technical guide has been prepared detailing Good Practice for Risk Assessment for Mine Gas Emissions. This presentation will report on the findings of the recent public consultation and key aspects of the soon to be published technical advice on better understanding mine gas risk assessment.

Dr Tom Henman, Director - Geosciences, RSK & Deputy Chair, SiLC PTP

14.10 Q&A



15.00 Exploring Best Practice in Detailing & Designing an Appropriate Gas Membrane 

  • Outlining key criteria outlined in BS8485:2015+A1:2019 regarding the design and specification of suitable gas membranes

  • Understanding the BS4845 points system and where / how it can be used

  • Incorporating gas membranes into MMC and modular buildings


Patrick Flood, Technical Director, Juta UK

15.20 Case Study: Radiocarbon Dating and Multiple Lines of Evidence Approach for a Complex Ground Gas Risk Assessment

  • Using a robust Conceptual Site Model (CSM) to identify all possible Source-Pathway-Receptor linkages

  • Radiocarbon dating techniques used to determine gas source

  • Demonstrating a multiple lines of evidence approach to determine accurate and justifiable site-specific ground gas risk values

  • Case Study demonstrating an innovative approach and the resulting benefits (High Pressure Gas Transmission facility)


Simon Dunstan, Senior Environmental Consultant, Atkins

Dr Bala Palananthakumar, Senior Environmental Engineer, Atkins

15.40 Q&A 

16.00 Closing Remarks from the Chair and Close of Conference 


14.35 Continue the Questions and Discussion in our Virtual Conference and Exhibition Lounge 

Continue the discussion, meet sponsors and network with other attendees in our interactive face-to-face conference and exhibition lounge

14.15 Continue the Questions and Discussion in our Virtual Conference and Exhibition Lounge 

Continue the discussion, meet sponsors and network with other attendees in our interactive face-to-face conference and exhibition lounge

March 24, 14:00 BST - Panel Discussion: Optimising Digital Innovations to Achieve Real-Time, Targeted Data Collection & Improved Risk Assessment

Brownfield Summit 2021 ticket holders can attend this panel discussion for free.


The benefits of technology and new digital techniques in facilitating data collection are being increasingly recognised. Remote sensing, continuous monitoring and wireless data management is now easier and more cost-effective and can improve data quality and availability, as well as facilitating its analysis for improved decision making, thus reducing time and project costs.

Furthermore, LCRM, the updated contaminated land guidance that has replaced CLR11 encourages the use of remote on-site technologies to give better insight. 

This Brownfield Intelligence Network panel discussion, which is taking place on 24 March at 14:00 BST, will discuss the use of this technology in improving contaminated land, ground gas and groundwater risk assessments through better refinement of the conceptual site model and developing robust, justifiable remediation and mitigation strategies. 


Q&A with VaporPin

Ahead of the Ground Gas 2021 conference, our Editorial Director Ian Grant asked Laurie Chilcote, Vice President, Vapor Pin Enterprises & Director of Sales & Marketing, Cox-Colvin & Associates and Craig Cox, President and Principal Scientist for Cox-Colvin & Associates a few questions on proven methods of refining vapour intrusion conceptual site models.

For more information on VaporPin visit: https://www.vaporpin.eu 

Headline sponsor:



PeroxyChem_LOGO_Evonik tag.jpg

Who should attend?

  • Scientific Officers

  • Principal Consultants

  • Technical Directors

  • Managing Directors

  • Contaminated Land Officers

  • Environmental Consultants

  • Contaminated Land Specialists

  • Geologists

  • Environmental Engineers

  • Contaminated Land Officers

  • Environmental Protection Officers

What did previous delegates think?

ST Consult


"The topics covered highlighted significant issues in the industry"

Geotechnical Consulting Group

“Updated and expanded my knowledge of the subject"

Delta Membrane Systems Ltd


“'Very informative and a great update on the current market'"

Wardell Armstrong

"It was very thought provoking and informative"

Supported by

Sign up for event updates