7.5 Brownfields Redevelopment with Solutions for Complex Hydrogeologic Conditions

Many Brownfields sites face numerous challenges when groundwater contamination occurs in challenging hydrogeologic conditions. While state and federal regulations allow risk-based and technical impracticability approaches to groundwater remediation, the practice shows that such approaches are rarely successful even when the site conditions are very favorable for implementation. Two case studies will address the regulatory and hydrogeologic challenges to groundwater remediation at Brownfields sites including the role of quantitative conceptual site models (CSMs), risk assessment, contaminant fate and transport (F&T) groundwater modeling, and technical impracticability (TI) waivers.