According to TCEQ standards, how far must public water supply lines be positioned from both lined and unlined evapotranspiration beds?

The correct choice of 10 feet is significant because it aligns with the TCEQ standards designed to protect the integrity of public water supplies and prevent possible contamination. The distance requirement is established to ensure that any potential issues related to the effluent from evapotranspiration beds do not compromise the quality of the water being supplied to the public.

Evapotranspiration beds are designed to manage wastewater through the natural processes of evaporation and transpiration, but they can also produce leachate. Maintaining a safe distance between these beds and public water supply lines is critical to minimize the risk of contaminants making their way into the drinking water system.

The other distances, while they might seem reasonable, are not scientifically supported by the protective measures encouraged by TCEQ. Ensuring the specified 10-foot buffer allows for adequate safety and separation, reflecting best practices in water management and public health safety standards.