What is the minimum required setback for underground easements from lined evapotranspiration beds?

The correct answer identifies that a minimum required setback for underground easements from lined evapotranspiration beds is 1 foot. This regulation is established to ensure that there is sufficient space for proper maintenance and operation of the evapotranspiration bed while also protecting the integrity of the underground easement.

A setback is critical to prevent any potential interference between the workings of the lined bed and the underground utility infrastructure, such as piping or cables. This distance helps to minimize the risk of structural damage or negative impacts on the utility services, while also allowing for necessary maintenance and repairs.

The other options suggest either a greater distance or no requirement, which would not adequately address the practical concerns related to maintenance and operational safety of the systems involved. Hence, the 1-foot requirement supports both functionality and regulatory compliance for safely managing the interactions between various subsurface systems.