Assessing the impact of source-zone remediation efforts at the contaminant-plume scale through analysis of contaminant mass discharge

► The long-term impact of source-zone remediation was assessed for a TCE-contaminated site. ► The impact of remediation was assessed through analysis of plume-scale contaminant mass discharge. ► The two source-zone remediation actions reduced contaminant mass discharge by approximately 90%. ► The approach allows linking source-zone remediation to the impacts on site-wide risk.