RPS provides a comprehensive range of human health quantitative risk assessment services to private and public sector clients. Consultants identify areas of liability and how to manage them in a practical and cost effective way. The RPS approach to risk assessment exceeds current UK best practice - all risk assessment work is carried out in three stages: site-specific criteria assessed; numerical analysis using proprietary models; and complex fate and transport modelling coupled with sensitivity analysis and probabilistic assessment. We identify the key data needs early in the development of a project to ensure efficient, focused and cost effective data collection takes place. Expert assistance is provided for exposure assessment, toxicity assessment, risk characterisation, uncertainty analysis, air modelling and waste classification.