Controlled Waters Risk Assessment

Controlled Waters Risk Assessment

The presence of contaminated land can pose a significant risk to controlled waters (surface water courses, groundwater, public water supplies/ abstractions). Where contamination is present on a site and represents a potential risk to a controlled water body, a groundwater risk assessment is likely to be required.

Initially, a conceptual site model (CSM) should be prepared to determine whether a controlled water receptor is likely to be at risk. The sensitivity of the receptor including data such as the aquifer status, confirmation of the underlying soil profile and the location of abstractions would be considered as part of the initial assessment. Subsequently, groundwater sampling, monitoring and testing can be undertaken to help identify impact on the aquatic environment from the subject site.

A groundwater risk assessment can range from a simple comparison of the sites water concentrations against appropriate screening values such as drinking water or environmental quality standards to long term monitoring of the potential migration of contaminants from their source and detailed computer based modelling (known as a detailed quantitative risk assessment – DQRA).

Nicholls Colton Group can provide site specific groundwater risk assessments to enable the delivery of robust, pragmatic and cost effective solutions to potential controlled water issues.