Detailed Quantitative Risk Assessment and Remediation – Merseyside

Background: E3P

E3P, working on behalf of a strategic land owner in the Merseyside area, undertook a strategic assessment of a number of historical ground investigation reports in or to determine the status of the site with respect to current regulations and standards. The review identified a significant constraint to a proposed industrial and commercial redevelopment in the form of a creosote plume which was considered to pose a risk to controlled waters. In order to quantify the risks further, E3P undertook a further phase of site investigation comprising, boreholes, probeholes and trial pits and installation of environmental monitoring wells.

Findings

Supplemented with latest low flow groundwater sampling and in-situ chemistry testing technique, E3P delineated the extent of the plume and utilised the results to complete a detailed Quantitative Risk Assessment (QRA). The QRA determined the level of risk to controlled waters while also determining the site specific remediation target based on the site setting and proposed end use. Using the QRA findings, E3P prepared a remediation specification and obtained quotes from a number of remediation contractors and advised the client with respect to the best technical and economical quote that would satisfy the environmental regulators.

Outcome

E3P determined that the extent of the contamination was far less significant than previously thought and that remediation could be achieved through in-situ methods that would ensure there would be no on-going risk to controlled waters.