Environmental Protection Agency (EPA) Model Lead Based Paint Risk Assessor Practice Test

Which of the following is NOT a method of interim controls for soil?

1. Grass planting

2. Mulching

3. Soil removal

4. Gravel application

The correct answer is: Soil removal

Soil removal is not considered an interim control method for managing lead-contaminated soil. Interim controls are strategies that aim to minimize exposure to lead while more permanent solutions are being established. Grass planting, mulching, and gravel application all serve as forms of interim controls by creating barriers that limit direct exposure to lead in the soil. For example, grass can help reduce erosion and prevent soil from being disturbed, while mulch covers the soil surface to prevent access to contaminated soil. Gravel application effectively creates a physical barrier, preventing direct contact and limiting dust generation. In contrast, soil removal is classified as a permanent solution because it involves the physical excavation and disposal of contaminated soil, rather than a temporary measure to manage exposure. This distinction is crucial in understanding how different approaches are utilized in lead hazard management and remediation efforts.