A site-specific hydrogeological risk assessment (HRA) must be included in all applications for an Environmental Permit (EP) for a waste disposal site. ESI, now part of Stantec, prepares hydrogeological risk assessments for landfill sites accepting inert, non-hazardous and hazardous waste, in a wide and varied range of locations and geological and hydrogeological environments.
A technical approach to risk assessment has been carefully designed. We work closely with regulatory bodies and the industry as a whole on the development and application of practical risk assessment methodologies. Through the production of a robust conceptual model, based on a comprehensive desk study, the level of risk assessment appropriate to the site is determined. If required, a suitable computer model is developed to represent conditions as accurately as possible.
We have our own in-house modelling software package – RAM – in addition to other software packages. This software is highly versatile and enables a flexible approach in developing risk assessment models. RAM provides a robust and transparent assessment of risks using the source-pathway- receptor methodology and can incorporate a constant or declining source term.
Our transient version of RAM (known as TRAM) has been developed to allow the assessment of a landfill’s performance through time, taking into account changes to the engineering containment measures that are in place (e.g. geomembrane liners and landfill caps).
Our services to support hydrogeological risk assessments for landfill and waste sites: