What is the main focus of the EPA Construction General Permit?

The main focus of the EPA Construction General Permit (CGP) is pollution prevention in construction activities. This permit is specifically designed to regulate stormwater discharges from construction sites to protect water quality. By requiring construction projects to have a CGP, the EPA aims to minimize the pollutants that can be washed away by rainwater into nearby water bodies.

The permit necessitates the implementation of a Stormwater Pollution Prevention Plan (SWPPP), which outlines the measures that developers must take to reduce sediment runoff and manage other contaminants that could adversely affect local ecosystems. This focus on reducing pollution at the source addresses the significant impacts that construction activities can have on water quality—one of the EPA's critical areas of environmental protection.

The other options, while relevant to the broader context of environmental management, do not capture the primary aim of the EPA CGP. Energy efficiency in vehicles pertains more to transportation policies, indoor environmental quality is focused on the health aspects of building interiors, and site management practices refer more generally to how construction sites are organized and supervised rather than the specific goal of reducing pollutant discharge.