Groundwater/ Controlled Waters Risk Assessments

The risks of contamination to the water environment (controlled waters) are commonly considered in conjunction with those to human health, often to satisfy a planning requirement.

In common with human health risk assessments, controlled waters risk assessments initially comprise a desk-based preliminary risk assessment, to produce the initial conceptual site model (CSM) and identify the source-pathway-receptor linkages, often followed by an intrusive investigation, to allow a qualitative risk assessment to be made.

Depending on the findings of the qualitative assessment, Ruddlesden can undertake a quantitative controlled waters risk assessment (also known as a P20 assessment), using borehole, laboratoryand hydraulic data to model the anticipated levels of contamination at controlled waters receptors and to derive on-site remedial targets.

Case Study

P20 Groundwater Risk Assessment Demonstrates No Remediation Required

At a former engineering works near Exeter, elevated levels of polyaromatic hydrocarbons (PAH) and total petroleum hydrocarbons (TPH) were recorded in both the soil and gr...

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