Geosyntec Consultants Ltd

Geosyntec is a specialist environmental consulting practice working in Europe. All local senior management have >25 years of consultancy experience. We provide services linked to understanding, managing and where possible eliminating residual environmental liability, mainly linked to contaminated land/groundwater and infrastructure at operational and "legacy" sites. We also deliver waste management and broader environmental solutions to clients.

Featured services

Brownfield regeneration/remediation

Geosyntec works for buyers and developers of brownfield sites, where they need a specialist consultancy practice to unlock value and undertake risk-based remediation of the development footprint and/or underlying groundwater. In most cases this can be done as part of the redevelopment programme. In some cases Geosyntec established longer term management, mitigation and/or protection systems to allow development to continue which are also designed to prevent blight and/or on-going impacts to the wider environment.

Contaminated land

Geosyntec is a recognised market leader with respect to contaminated land and groundwater. We work with industry, as well as developers of industrial and other land, to understand, rationalise, manage and/or remediate residual environmental liability issues. We provide expert yet practical advice and solutions to contaminated land and groundwater issues. Core to our service offering are source audits, phased investigation programmes, numerical modelling and quantitative risk assessment, regulatory negotiation, ultimately leading to risk based corrective action (remediation)where needed.

Due diligence/auditing

Geosyntec, through the CAT Alliance ("CAT"), is a leading global provider of environmental and broader due diligence (EDD) services linked to mergers and acquisitions. CAT has resident capacity in over 50 countries and access to approximately 10,000 staff around the world. The core CAT Partners, COWI, Geosyntec and Tauw, have a large and very long established presence across Europe and North America. Our service offering is broader than what is typically provided by others because of our blend of engineering and environmental expertise and given we are contaminated land and water specialists.

Environmental fate & degradation

Understanding the environmental fate and transport of contaminants, and how important natural attenuation is in this process, is core to Geosyntec's service offering. Such detailed assessment and modelling informs quantitative risk assessment plus remedial solution planning/implementation. Geosyntec employs a range of experts, including chemists, hydrochemists, microbiologists, contaminant hydrogeologists and hydrologists to predict and quantify environmental fate and degradation. We have a specialist laboratory facility at which chemical fate/transport and treatability studies are performed.

Environmental risk assessment

Environmental (human health) risk assessment forms the central framework within which the contaminated land and groundwater investigation and remediation programmes we manage are conducted. Risk based decision making is fundamental to successful and sustainable corrective action linked to contaminated land and groundwater. Geosyntec personnel have been at the forefront of quantitative risk assessment use and development for 20 years. This includes risk to the environment and human health and specialist areas such as vapour intrusion risk, and risk associated with new and emerging contaminants.

Expert evidence/witness

Geosyntec employs experts in their field(approximately 25% with PhDs and 55% with MSc or equivalent). Because of this we are able to support our legal and corporate clients in litigation and related cases. Globally >10% of our consultancy work is linked to such a legal driver. Our project work has included site or business specific environmental or engineering performance claims, sale purchase agreement related claims, including Nationally important cases. Provision of expert reports is of course core to what we do, as is providing expert opinion and expert testimony if cases proceed to court.

Geotechnical investigation

Geosyntec has a strong and well respected Geo-Environmental & Geotechnical practice. We work on challenging geo-environmental projects linked to, in particular, landfill or ash lagoon management, stabilisation and/or closure; large scale cut-off or reactive barriers to isolate or treat contaminated areas and groundwater; and geo-environmental studies linked to river, lake or marine environments. We are also expert providers of monitoring instrumentation linked to geotechnical and/or geo-environmental projects (e.g. Crossrail underground construction information management system)

Government policy development

Geosyntec consultants has provided key policy and guidance documents to European governments, including in Scandinavia, the UK & Ireland. Some of these are linked to specific areas of expertise including non-aqueous phase liquids (NAPLS & DNAPLS), the fate and transport of chlorinated solvents and vapour intrusion. A specific role in Ireland has been to lead the development of new contaminated land/groundwater policy and practice, including guideline template reports, risk ranking system for licensed industrial and waste management sites, and training/support of the EPA enforcement team.

Industrial processes/hazards

Geosyntec Consultants work with a sister company MMI Engineering in the UK to provide a wide range of safety and risk management services re. industrial processes and hazards. These include Safety Case and COMAH Case development, HSE auditing, performance standards development, probabilistic fire/blast risk assessment, ALARP studies and fire/gas detection layout and optimisation studies. Our Major Hazards Engineering offering includes fire/explosion hazard derivation including blast protection assessment/design, smoke/gas dispersion modelling and fire protection system inspection and design.

Landfill services

In the UK/Europe Geosyntec has completed numerous landfill related projects over the past few years. These have included long-term management and aftercare programmes; site restoration programmes including re-profiling and capping an industrial waste landfill; and consultancy support designed to achieve permit surrender. An on-going project has involved working for a European multinational with waste management sites across Europe to evaluate the functional stability and completion of landfill aftercare, to optimise and complete post-closure aftercare as efficiently/sustainably as possible.

Mergers & acquisitions

Geosyntec, through the CAT Alliance ("CAT"), a leading global provider of environmental and broader due diligence (EDD) services linked to mergers and acquisitions. CAT has resident capacity in over 50 countries and access to approximately 10,000 staff around the world. The core CAT Partners, COWI, Geosyntec and Tauw, have a large and very long established presence across Europe and North America. Our service offering is broader than what is typically offered in the market, because of our blend of engineering and environmental experts, and given we are contaminated land and water specialists.


Geosyntec is a market leader and at the leading edge of the design and development of specialist remedial technologies including KB-1®, Savron (STAR) and electrokinetic (EK) ISCO or BIO. Geosyntec is a globally recognised specialist re. the insitu remediation of contaminated land/groundwater and has worked on remediation projects throughout Europe. Our work includes feasibility studies, pilot testing at laboratory and field scale, outline and full scale design, corrective action implementation and verification. This can incorporate infrastructure upgrades and demolition programme management.

Risk & safety

We provide risk and safety solutions based on the sound application of engineering, science and technology in combination with experience in design, construction, operations and project management. Our staff come from a wide range of engineering and scientific disciplines including: structural, mechanical, civil, geotechnical, chemical and petroleum engineers who work alongside physicists, chemists and mathematicians. Services provided include safety/COMAH case development; quantitative fire and blast modelling/mitigation; structural and stress analysis design, and fire fighting system design.

Active services

Services/specialisms by percentage of recent turnover
Asbestos management/analysis2
Brownfield regeneration/remediation5
Contaminated land20
Due diligence/auditing5
Environmental fate & degradation6
Environmental law/compliance1
Environmental risk assessment6
Expert evidence/witness3
Geotechnical investigation2
Government policy development4
Industrial processes/hazards2
Landfill services3
Mergers & acquisitions4
Nuclear services3
Project management2
Risk & safety2