Several proprietary in-house mathematical (computer) models have been developed that have been applied to predict transport, exposure and risk to organic and inorganic contaminants and radionuclides.

Most of the in-house models are designed within a probabilistic modelling framework, facilitating quantitative uncertainty and sensitivity analysis. A comprehensive quality assurance program was set in place and followed throughout the model development. Some of the proprietary models used in-house include the following:

• UTAP (Uranium Tailings Assessment Program (updated)) - simulates physical and chemical reactions and radiological in-growth and decay in tailings; evaluates loadings of radionuclides and other dissolved ions in contaminated seepage from uranium tailings areas and detailed environmental transfer and exposure. The assessment of several tailings close-out options are built into the model such as the evaluation of acid generation and other reactions within submerged tailings.
• INTAKE (Assessing Environmental Transfer, Uptake and Risk) - simulates environmental transfer, exposure (human and ecological) and risk to radionuclides, metals and other inorganic species from contaminated sites or industrial facilities; includes evaluation of exposures and risks to background environmental concentrations of species modelled. The model includes detailed environmental models including an advanced soil model and detailed modelling of water column transfer, sedimentation and in-growth and decay of radionuclides. Domestic and game animals are modelled.
• AERIS (Aid for Evaluating the Redevelopment of Industrial Sites) - simulates on-site environmental transfer of organic contaminants and metals and develops risk-based, site-specific clean-up criteria. The AERIS model includes a sophisticated model for evaluating vapour migration from the subsurface to indoor or ambient air.
• AMIR (Assessment of Municipal and Industrial Risk) - uses a comprehensive selection of environmental transfer and exposure routes to simulate risk to organic and stable inorganic species of contaminants from contaminated sites or industrial facilities; includes evaluation of exposures and risks to background environmental concentrations of species modelled.
• Site or application specific models - numerous site specific models have been developed through site-specific model development or adaptation of existing models to specific sites.