What must be included in the SWPPP concerning materials expected in storm water discharges?

The inclusion of a list of significant materials in the Storm Water Pollution Prevention Plan (SWPPP) is critical for identifying potential pollutants that could be present in stormwater discharges. This list typically details materials that are stored, handled, or processed on-site and have the potential to contaminate stormwater. By identifying these materials, the facility can take the necessary measures to prevent their release during storm events, thereby protecting nearby water bodies from pollution.

This aspect of the SWPPP is essential for compliance with regulatory requirements and for implementing effective pollution prevention strategies. It allows operators to assess risks and design appropriate Best Management Practices (BMPs) to minimize the impact of stormwater runoff on the environment. The other factors mentioned, such as structural controls, employee training sessions, and facility maps, while important for different aspects of stormwater management, do not directly address the critical need to identify and manage significant materials that could affect stormwater quality.