CL:AIRE is a UK charity committed to providing a valuable service for all those involved in sustainable land reuse.
We develop training resources, disseminate information and act as a credible resource for all stakeholders, ensuring we remain at the cutting-edge of best practice and innovation.
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Guidance on the Assessment and Monitoring of Natural Attenuation of Contaminants in Groundwater
In April 2024, CL:AIRE published Guidance on the Assessment and Monitoring of Natural Attenuation of Contaminants in Groundwater.
Monitored natural attenuation (MNA) can be a sustainable risk management strategy for a wide range of groundwater contaminants, where environmental data are collected and assessed that demonstrate natural attenuation will protect receptors from pollution or harm. Natural attenuation refers to the combination of physical, chemical and biological processes that act, without human intervention, to reduce contaminant concentrations, flux or toxicity.
The Environment Agency originally published technical guidance for MNA in 2000 in its R&D Publication 95. Since then, significant scientific advances have been made in understanding contaminant behaviour and reactive transport in the subsurface, alongside ongoing developments in site characterisation, monitoring and predictive modelling approaches and technologies, that are captured in this updated guidance.
CL:AIRE would like to gratefully acknowledge the Environment Agency for its seed funding for this project and the individuals of the working group for their time in authoring sections along with their technical discussions and review of the guidance. The final document has kindly been reviewed and supported by the Environment Agency, Natural Resources Wales, Scottish Environment Protection Agency and the Northern Ireland Environment Agency (NIEA), an agency within the Department of Agriculture, Environment and Rural Affairs (DAERA). CL:AIRE would also like to thank its Technology and Research Group for their peer review of the document prior to publication.
Working Group
George Flower – Arcadis
Thomas Grosjean – BP
Nicola Harries – CL:AIRE
Kirsten Johnstone – Environment Agency
Ian Jones – Natural Resources Wales
Matt Llewhellin – Natural Resources Wales
Brian McVeigh – formerly Northern Ireland Environment Agency
James Rayner – Geosyntec
Matt Riding – WSP
Isla Smail – Scottish Environment Protection Agency
Jonathan Smith – Shell
Rob Sweeney – CL:AIRE
Alan Thomas – ERM
Russell Thomas – WSP
Gary Wealthall – Geosyntec (retired)
The MNA guidance document can be downloaded for free at www.claire.co.uk/mna (PDF 9MB).
Concawe publishes sustainable remediation report and ten case studies
Concawe has published a new report called Case Studies and Analysis of Sustainable Remediation Techniques and Technologies.
The report aims to fill in a recognised gap in the provision of detailed case studies documenting the practical implementation of sustainable remediation, and facilitate further refinement of guidance.
Industry views wanted on piling on land affected by contamination
CL:AIRE is pleased to be collaborating with The Environmental Protection Group Ltd and a cross-industry Technical Working Group, to update the Environment Agency guidance "Piling and Penetrative Ground Improvement Methods on Land Affected by Contamination". To help set the scope of this update, CL:AIRE is seeking feedback from industry around what works well about the current document and what needs to be improved. If you are familiar with the current guidance and undertake, review, or procure foundation works risk assessments, then we want to hear from you!
Please click the following link for more information and to access the piling questionnaire https://forms.office.com/e/XKt0fxAkXk. We would like your comments by the end of 16 June 2023.
Student Contest in ICEM 2023 - International Conference on Environmental Remediation and Radioactive Waste Management
The International Atomic Energy Agency (IAEA) is supporting the ICEM 2023 International Conference on Environmental Remediation and Radioactive Waste Management to be held at the International Conference Centre Stuttgart, Germany, 3-6 October 2023.
The American Society for Mechanical Engineers (ASME) and the IAEA are committed to stimulate and broaden the perspectives of students in areas related to nuclear energy. Therefore, ASME, in support with IAEA are excited to bring a student competition to ICEM 2023.
New CL:AIRE Publication: Guidance on applying statistics to land contamination decision-making
CL:AIRE is pleased to announce that "Professional Guidance: Comparing Soil Contamination Data with a Critical Concentration" has been published and is now available to download for free from the CL:AIRE website.
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Defra publishes interim approach to the PMT concept to support UK REACH risk management of PFAS
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Contamination & Land Remediation Expo returns to NEC Birmingham in September 2025
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CL:AIRE’s Talent Pool
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New CL:AIRE TRG Member
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Environment Agency publishes its latest corporate strategy report
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Transitional period ends for NHBC 2007 ground gas guide
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Defra and Welsh Government publish reforms to the waste exemptions system, including the U1 exemption
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New soil sustainability resource for planners
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Defra calls for evidence about expanding the role of private sector investment in nature recovery
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National Brownfield Forum publishes the results of its task and finish group research work
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Defra publishes Natural Capital and Ecosystem Assessment programme
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Defra updates the policy paper on the implementation of digital waste tracking
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UK Government publishes infrastructure pipeline of projects
The UK Government has published the Infrastructure Pipeline, which is a key element underpinning the delivery of the Government’s 10 Year Infrastructure Strategy. The Pipeline provides industry and investors with...July 2025 -
Government consults on the effectiveness of land remediation relief
His Majesty's Treasury is consulting on the effectiveness of Land Remediation Relief (LRR). LRR is a 150% Corporation Tax relief aimed at incentivising the regeneration of brownfield land and reducing the...July 2025 -
Defra and Environment Agency publish best available technique guidance in relation to environmental permits
The Department for Environment, Food and Rural Affairs (Defra) and the Environment Agency have recently published Best Available Technique (BAT) guidance in relation to environmental permits. The guidance details what...July 2025 -
Environment Agency publishes position statement on nature-based solutions
The Environment Agency has recently published its position statement on Nature-based Solutions (NbS) and its approach to how NbS support outcomes in flood, climate and nature recovery. It isJuly 2025
British Standard 1377-9 is available for comment
The following British Standard is available as a Draft for Public Comment (DPC): BS 1377-9 – Methods of test for civil engineering purposes – Part 9: In-situ tests until 6 August.June 2025 Defra publishes new national standards for SuDS
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Call for abstracts for SoBRA/RSC Winter Conference
SoBRA/RSC are seeking abstracts for presentations at their Winter Conference on ‘Current Issues in Contaminated Land Risk Assessment’ (10 December, London). Submissions are invited on any topic relating to brownfield risk...June 2025
GPVS application window open until 31 August
June 2025The Gas Protection Verification Accreditation Scheme (GPVS) application window is open until 31 August 2025. The application window is open to Technician Grade and Specialist Grade applicants. Further... Contamination and Land Remediation Expo tickets now available
Claim your FREE tickets for Contamination and Land Remediation Expo (CLR Expo) now! CLR Expo is a part of the UK’s largest event for environmental services industry, taking place from...June 2025