Hydrogeological risk assessment guidance and tool to set targets to remediate (clean up) contaminated land or groundwater.
This report presents a recommended methodology for deriving site-specific remedial (clean up) objectives for contaminated soils or groundwater to protect the aquatic environment.
The methodology applies to soils and groundwater that are already contaminated, where the original surface source of the contamination has stopped.
The methodology consists of up to 4 assessment levels which progressively follow the pathway from the contaminant source through to the receptor. A remedial target is derived at each level, but this is likely to be less stringent at the next level as additional processes such as dilution are taken into account. This approach enables attention to be focussed on those sites where the risks are greatest.
User manual version 3.1 is valid for use with worksheet version 3.2.