When it is NOT possible to meet the EPA requirements for containing water runoff, where should training be performed?

Performing training on a nonporous concrete surface is the best choice when it is not possible to meet EPA requirements for containing water runoff. This type of surface is designed to prevent water from infiltrating into the ground, which means any runoff can be collected and managed more effectively. Nonporous surfaces can often be equipped with appropriate drainage systems to direct excess water to designated containment areas, helping to control potential contamination and ensuring compliance with environmental regulations.

In contrast, areas such as grassy areas or porous soil surfaces may not effectively contain runoff, potentially allowing hazardous materials to leach into the groundwater or surrounding areas, which could lead to environmental violations. Training inside a facility might also be necessary in some contexts, but it is essential to consider whether the training environment specifically addresses the containment requirements. Therefore, nonporous concrete is the optimal surface for managing runoff during training when compliance with the EPA requirements cannot be fully met.