LQM is a specialist environmental consultancy based in Nottingham (UK) with an international reputation for assessing and managing the risks posed to human health and the environment by contaminants in soil. Increasingly this is being done within a context of sustainable development and specifically sustainable brownfield regeneration.

We provide consultancy, peer review and expert witness services, contract research and training courses on all aspects of the management of land contamination to problem holders, developers and local government.

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Technical Briefing Webinar (Ground Gases): Correct application of BS 8485 (1.25 hours)

Recording Available Here

Toxic, asphyxiating or explosive gases can leak from the ground and accumulate in buildings, posing health risks.

BS 8485:2015+A1:2019 is the Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings. It describes how to characterize sites and prevent the entry of carbon dioxide and methane into new buildings.

The 2019 amended edition of clarifies the gas protection scoring methods and the criteria for gas resistant membranes.

This Technical Briefing Webinar, hosted by LQM, will be delivered by Steve Wilson who is Technical Director of the Environmental Protection Group (EPG) Limited. Steve has authored numerous technical papers and publications and provided training relating to gassing issues over many years. Steve will provide insight into the correct application of this important, but often poorly applied, British Standard.

Following the webinar you will be supplied with a webinar recording and copy of the slides.

Prices: Prices exclude VAT. Please note purchase is via online card payment onlyTerms and Conditions apply

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  • Testimonials

This webinar (BST 1315-1430) will cover:

  • The foundation of any use of BS8485 – a pictorial gCSM
  • The next important step – data quality assessment
  • Difference between hazardous gas flow rate and GSV
  • The 1% and 5% consideration for moving from CS1 to CS2 – when is it appropriate to increase the classification (differentiating between high risk and low risk sites)
  • How you should correctly apply BS8485 to your sites to arrive at a Characteristic Situation

At the end of the webinar, you will:

  • Understand better how to apply BS8485 correctly
  • Provide clients with a better service by avoiding over specification of gas protection measures where they are not required
  • Make sure developments that need it are provided with adequate gas protection

Get the chance to ask Steve questions!

This webinar is mainly relevant to regulators (including local authority staff) and consultants involved with the redevelopment of sites where ground gases are likely to be an issue.

It will be particularly relevant to anyone looking to:

  • - recommend gas protection systems for sites with ground gas issues
  • - review or regulate reports recommending gas protection systems


Location Date Place Cost Places
Recorded Webinar Available TBC £30.00 5


Note: All prices exclude VAT, which we are obliged to charge at the prevailing rate




Can't make these dates?  Have lots of potential delegates? Have you considered hosting this course for your staff? Or commissioning a bespoke course to meet your training needs?

“Thank you to Steve Wilson and Geoff Card for an awesome day”

“Thanks for such a great presentation, it was honestly one of the best training events I have been to”

"Very good overview of ground gas assessment and how the industry in general needs to step up and undertake the assessments properly" (Consultant, 2019)

"Well paced and covered topic well" (Consultant, May 2019)

"Listing to Steve's detailed outline of how the BS should be applied, on a point by point section and particularly use of example sites & common errors & misinterpretations that he comes across. Questions and answers were good too." (Consultant, May 2019)

"All very informative and good chance to ask questions" (Local Authority, May 2019)

"Improved my understanding of GSV's and the CSM" (Consultant, May 2019)

"Good presenter, informative presentation" (Consultant, May 2019)

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