In Situ Treatment Performance Monitoring: Issues and Best Practices, 2018, EPA

In Situ Treatment Performance Monitoring: Issues and Best Practices, 2018, EPA

The utility of monitoring wells for performance or attainment monitoring is based on the premise that contaminant concentrations measured in the wells are representative of aquifer conditions. However, during in situ treatment, various biogeochemical and hydrogeological processes and sampling and analysis procedures may affect the representativeness of the monitoring well and sample quality, which may not be adequately considered in current remediation practice. 

A properly designed monitoring network that anticipates the distribution of amendments after injection would minimize impacts to monitoring wells. However, predicting amendment distribution prior to injection is challenging such that impacts to monitoring wells are likely. 

The purpose of this issue paper is to: