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For the design of sustainable and cost-effective management strategies for contaminated sites, decision makers need appropriate tools, i.e. environmental decision support systems to assist them in the planning, assessment, selection and optimisation of possible alternatives. We propose a novel system dynamics model, CARO-PLUS (Cost-efficiency Analysis of Remediation Options), which provides estimates of current and future risks originating from soil and groundwater contamination. Utilising a source-pathway-receptor concept, the model particularly addresses the presence of multi-compound non-aqueous phase liquids in porous media, which have been identified as major sources of groundwater contamination at many of these sites. Simplified approaches for the description of contaminant release and transport, as well as of exposure pathways for human health risk assessment, allow for a fast and effective …