What is a Detailed Site Investigation (DSI)?

A Detailed Site Investigation (DSI) is a comprehensive assessment conducted to determine the extent and nature of contamination on a site, usually following a Preliminary Site Investigation (PSI) that flagged potential issues. The DSI involves soil, groundwater, and sometimes soil gas sampling, along with risk analysis to understand any impact on human health or the environment. It’s typically required when a site is being redeveloped, particularly if it was previously used for industrial or high-risk activities. The results help inform remediation strategies, ensure compliance with environmental regulations, and provide peace of mind to stakeholders before moving forward with construction or sale.