Development of Acute Generic Assessment Criteria for Assessing Risks to Human Health from Contaminants in Soil

Issue Date: 30th April 2019

This report presents a methodology for derivation of AGAC that risk assessors may choose to use to help in the assessment of acute health risks from short-term exposure to contaminants in soil. In the UK, the assessment of risks to humans from land contamination has traditionally tended to focus on chronic exposure scenarios. However, focusing on chronic exposure may not always be protective of potential acute exposure scenarios, especially in non-residential settings, and/or if statistical methods are used to interpret site soil data. The report was developed to address the absence of such guidance in order to support risk assessment practitioners and promote awareness within the contaminated land sector.

27 July 2020 Corrigendum : The authors of SoBRA’s AGAC report have discovered an error in the calculation of the AGACs for the vapour pathway for benzene (adult and child), phenol (child), trichloroethene (adult and child) and vinyl chloride (child). These had been incorrectly calculated due to use of log Koc rather than Koc in the calculation spreadsheets.  A new version of the report (version 2) has been produced with these values corrected (the new AGAC are higher than before) which is available on the link below.

Practical Tips Document 2018

June 2018

In June 2018, the Society of Brownfield Risk Assessment (SoBRA), the Geological Society Contaminated Land Group and RemSoc delivered a conference targeted towards early careers learning.  Its aims were:

  • To support technical excellence in the assessment, estimation & evaluation of risks and associated uncertainties from land affected by contaminants;
  • To encourage “good practice” in the practical application of risk assessment to support decisions regarding the appropriate management of land contamination; and
  • To facilitate and widen access to the dissemination of knowledge regarding land contamination risk assessment.

A commitment of this workshop has been the creation of a series of short tabular reports for each of the different discipline areas.  We have produced three practical tips documents which include human health risk assessment, controlled waters risk assessment and vapour intrusion (include link).

Site Investigation and Risk Assessment for Historic Landfill Redevelopment (SoBRA 2016)

Issue Date: 8th June 2018

SoBRA held a workshop on uncertainty in human health risk assessment in June 2016. The objective of the workshop was to consider key issues associated with the CSM and site investigation for landfill sites. Delegates were asked to consider a wide range of issues to identify those representing accepted scientific understanding and/ or good practice, and those which require further work to extend, improve or clarify current understanding or practice.

Uncertainty in Human Health Risk Assessment (SoBRA 2015)

Issue Date: 24th April 2018

SoBRA held a workshop on uncertainty in human health risk assessment in June 2015. The objectives of SoBRA’s summer 2015 workshop were to define the current state of our understanding of the key issues surrounding uncertainty in human health risk assessment and to establish where there is (and is not) consensus on mitigation measures