What is the purpose of post-remediation monitoring wells?

• A. To measure rainfall patterns in the site area
• B. To monitor air quality during remediation
• C. To assess municipal water supply quality
• D. To evaluate effectiveness, confirm plume reduction, and ensure compliance with cleanup goals

Answer: (D)

Post-remediation monitoring wells are used to verify the success of a cleanup by tracking contaminant concentrations over time and confirming that the plume is reducing or stabilizing. They provide data on how the groundwater quality within and downgradient of the treated area changes, showing whether cleanup goals are being met and whether the remedy is effectively containing or reducing the plume. This information guides decisions on whether remediation is complete, needs adjustment, or can shift to long-term monitoring for regulatory compliance. In short, these wells specifically evaluate groundwater cleanup performance and plume behavior, not rainfall, air quality, or municipal water supplies.