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GeoAssist Limited - Civil, Environmental and Geotechnical


Environmental Risk Assessment

Environmental Risk Assessments are generally carried out in conjunction with geotechnical surveys to provide an efficient and cost effective assessment of land for development of brownfield sites.

The scope of Environmental Risk Assessment ranges from sampling and basic testing of topsoil/subsoil soft landscaping cover for individual residential properties to extensive sampling and comprehensive contaminant testing of soils and groundwater on heavily polluted industrial sites.

Preliminary Risk Assessment (Desk Based Study - Phase I)

A Preliminary Risk Assessment (PRA) involves site reconnaissance and the gathering and research of information and data relating to the site from all available sources. The PRA often forms the first step of any site investigation.

The following data is frequently included in a Desktop Study:

  1. Aerial photographs of the site

  2. Data regarding coal mines, workings & seams

  3. Data regarding Environment Agency Registers

  4. Description & justification of the next steps if required

  5. Description of the site and surroundings

  6. Details of the intended future use of the site

  7. Geology & Hydrogeology of the area

  8. Location of relevant surface waters

  9. Ordnance plans & maps both present and past

  10. Outline / Preliminary Conceptual Model

  11. Potential sources of contamination

  12. Site location map & layout plans

  13. Utility records

The approach adopted for a particular investigation, its extent and the techniques used will all depend upon the site-specific circumstances, and the experience and judgement of those involved as well as any specific requirements of the client.

Quantitative Risk Assessment (Site Investigation - Phase II)

If the the preliminary risk assessment establishes potential pollutant linkages within the conceptual model then an intrusive investigation will be required to validate or update the Conceptual Model. The investigation includes data on the presence and extent of contaminants and pathways that may form pollutant linkages and give rise to unacceptable risks, and information on other characteristics of the site that are relevant to the risk assessment and decision making process.

Our depth of technical knowledge and professional expertise, coupled with our own in house drilling division as well as in-house soils and rock testing laboratory enables us to fulfil all your environmental and geotechnical site investigation requirements and gives our clients the results they need, when they need them.

Remediation Strategy

Should unacceptable risks be identified by the Quantitative Risk Assessment then a strategy to reduce the risks must be devised and implemented to the satisfaction of all interested parties. This step would ordinarily include an appraisal of the most effective options available in terms of both cost and risk reduction.