Which type of discharge from a construction site is NEVER allowable?

Discharge from contaminated groundwater is NEVER allowable from a construction site because it poses a significant risk to water quality and public health. Contaminated groundwater can contain pollutants such as heavy metals, chemicals, and pathogens that can contaminate surface waters and aquatic ecosystems. The release of such contaminants into the environment can lead to adverse effects on wildlife, drinking water supplies, and overall ecosystem health.

In comparison, while discharges from borrow areas, dewatering activities, and staging areas may be subject to regulations and management practices to minimize pollution, they can be permissible under certain controlled conditions. Effective management practices can be put in place to treat or manage these discharges to protect water quality. However, discharges from contaminated groundwater lack such flexibility because of their inherent risk, which is why they are strictly prohibited.