When an impervious geotextile liner is installed in a tank excavation, where should the observation well be located?

The correct placement of the observation well being inside the tank hole liner is crucial for effective monitoring and assessment of potential leaks or contamination. By situating the observation well within the impervious geotextile liner, it allows for more direct measurement of any potential groundwater contamination that may occur from the tank, enabling a timely response to any leaks.

This placement ensures that any changes in water quality or levels can be detected promptly, as the well would be in close proximity to any potential areas of concern due to the tank's operations. Proper monitoring in this location supports compliance with environmental regulations and helps protect both public health and the surrounding environment.

Other locations, such as the site perimeter or above the tank, would not provide as accurate or timely information regarding potential leaks, while positioning the well near but outside the liner may also fail to capture direct impacts from the tank's contents. Hence, locating the observation well inside the tank hole liner aligns best with monitoring protocols and enhances the effectiveness of the UST system management.