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Contaminated Land Assessment – Northern Ireland (NI)

Our Contaminated Land team specialise in investigating sites to identify any pollutants that are potentially damaging to the environment or human health. These risks must be dealt with by scientifically proven and governmentally recognised methods to make your development safe and crucially, allowed to continue.

Our team at OSM (headed by Director and Contaminated Land Expert, Frank Macfarlane) have over 20 years of experience in contaminated land assessments across the UK and Ireland, guiding projects from start to finish for clients of all scales. We take pride in our work, personally carrying out every stage of the assessment to ensure the most accurate results. We take a pro-development approach, finding cost and time effective solutions to ensure your site is risk assessed in line with UK guidelines (CLR11 and forthcoming updates).

Speak directly with one of our Contaminated Land team today

Contaminated Land Services include

• Environmental Due-Diligence Assessments
• Phase 1 Preliminary Risk Assessments (PRA)
• Intrusive Site Assessments
• Phase 2 Generic Quantitative Risk Assessments (GQRA)
• Phase 3 Detailed Quantitative Risk Assessments (DQRA)
• Ground Gas Risk Assessments
• Remedial Options Appraisals
• Remediation Strategies and Remedial Supervision
• Validation / Verification Supervision and Reporting
• Foundation Works Risk Assessment / Piling Risk Assessment
• Waste Classification Assessments

To view our latest projects, including Contaminated Land Assessments, click here.

What is a Contaminated Land Assessment?

The UK Government consider land contaminated if it has the potential to cause ‘significant harm to people, property or protected species’ or pollute local water. For many sites, it is a legal requirement to carry out a Contaminated Land Assessment to ensure any risks to the environment or human health are identified and effectively dealt with.

When conducting a Contaminated Land Assessment, our contaminated land team are fully compliant with current government guidelines CLR11, independently evaluating your site through four key phases:

Phase 1 – Preliminary Risk Assessment (PRA)

This stage combines in-office research, in person visits and site conceptual modelling to assess if your site has potential for contamination.

Phase 2 – Intrusive Investigation (GQRA)

If our team find unacceptable risks to the environment or human health in Phase 1, we will carry out an Intrusive Investigation by drilling boreholes or excavating trial pots to sample soil, ground gas and groundwater to determine if there is risk to people or the environment.

Phase 3 – Remediation

From Phases 1 and 2, our Contaminated Land Team will develop a Remediation Strategy stating what action is needed and recommending best practices to clean up your site. This plan should be approved by the NIEA before going ahead.

Phase 4 – Validation

Finally, OSM Consultants will check in with you to verify the Remediation Strategy has been successfully implemented. We will then provide a Remedial Validation Report to the NIEA, allowing your site to be successfully developed.


OSM Environmental Consultants are experts in Contaminated Land and have assessed hundreds of sites across Northern Ireland, the UK and the Republic of Ireland. We take a pro-development approach and use our extensive experience to ensure your site is fully compliant with all government regulations and can proceed with minimal delay and effort on your behalf. If you require a Contaminated Land Assessment, get in touch with our team today.