Ruddlesden geotechnical

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, laboratory and 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 groundwater beneath the site.

Case Study

CBR Values for Road Pavement Design, Cornwall

Ruddlesden geotechnical were commissioned to undertake California Bearing Ratio (CBR) testing to provide a design CBR value for road pavement design.