Contaminated Land Risk Assessment

Earth Science Partnership - Land Risk Assessment diagram

The industrial heritage of the UK has left a legacy of previously developed land across the country. New initiatives, both financial and legislative, are resulting in more and more developments on such sites. To be successful, the impact of the contamination hazard has to be understood and mitigated against beginning with a Contaminated Land Risk Assessment.

ESP is experienced in performing tiered risk assessments, using methodologies dictated within published guidance, and using quantitative risk assessment models, to derive site specific remedial targets for a range of receptors. These include health assessments from soil contamination, controlled water risks assessments, and ground gas assessments.

As a result of the assessments we will contribute to the design, implementation and validation of any mitigation measures or remediation schemes.

Developing Conceptual Models is an essential part of any geo-assessment. It requires a detailed knowledge of the geology, hydrogeology, and the nature of the contaminants. We have the knowledge necessary to produce accurate, defensible Conceptual Models and have done so on a wide variety of sites. These have included mine workings, industrial facilities and at dock land where complicated groundwater regimes are common.

Earth Science Partnership - Land Risk Assessment diagram 2

An extensive knowledge of the history and nature of the contaminants is also necessary. ESP has a proven track record on many different sites with a wide variety of contaminants, including hydrocarbons, heavy metals and pesticides. We use a range of accredited laboratories for sample analysis to ensure accurate and efficient turnaround, all of which is important in developing an accurate Conceptual Model.

Numerical modelling is a valuable tool for generating an accurate representation of the dispersion of contamination across a site. This requires a detailed understanding of the geology and groundwater regime and an in-depth knowledge of a number of different software programs. Deterministic and probabilistic methods are important in developing the understanding of contaminant behaviour and migration pathways in a tiered approach.

At ESP we use a suite of software programs including MODFLOW, Surfer, and a number of different Excel based programs including those developed by the Environment Agency and US Government. As each project and site has different requirements, our numerical modelling selections are tailored to suit individual needs and requirements.

Earth Science Partnership - Land Risk Assessment diagram 3A detailed understanding of the site conditions as well as current land and environmental legislation is vital to the carrying out of both qualitative and quantitative risk assessments. Earth Science Partnership provides the skills necessary to delineate sources, pathways and contamination receptors, using Environment Agency and other authoritative guidance.

Risk assessment is often cost effective as in many cases the delineation of contamination, along with understanding the geological conditions can significantly reduce or eliminate remediation requirements.

Project Example: Geotechnical Engineering, Site Investigation, and Contaminated Land Risk Assessment

Earth Science Partnership - Land Risk Assessment InvestigationESP supervised and directed a site investigation in order to carry out a combined geotechnical and geoenvironmental investigation and to conduct a contaminated land risk assessment. This was undertaken to establish costs and planning risks for a proposed residential development.

Historically the site had been heavily affected by mining with opencast and underground entry taking place for over 200 years. The opencast areas were backfilled with mixed materials to create a development platform upon which a major factory was constructed. This factory used a number of solvent and hydrocarbon compounds in their processes and there had been a history of spillages.

A selected list of example projects can be found on our Projects and Technical page.

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