Name an acceptable method for soil lead remediation.

Soil removal or capping with clean soil or sod is an acceptable method for remediating lead-contaminated soil. This approach effectively reduces exposure to lead by physically removing the contaminated soil from the environment or by sealing it under a layer of clean material. Capping, which involves applying a layer of clean soil or sod on top of the contaminated area, can help prevent direct contact with the contaminated soil and also minimize the potential for lead particles to become airborne.

This method is scientifically supported as it directly addresses the source of lead exposure. By ensuring that the contaminated soil is either removed or capped, the risk of lead entering the food chain, particularly through consumption of plants grown in contaminated soil, is significantly diminished. Additionally, it creates a safer environment for play and other activities in affected areas.

In contrast, planting grass over contaminated soil might provide temporary coverage but does not adequately resolve the underlying issue of lead contamination. Covering the area with plastic may limit exposure but is not a permanent solution and could lead to other environmental concerns. Adding lead-binding chemicals can help immobilize lead in some circumstances, but this method does not physically remove the source of contamination and may not be as effective in completely mitigating the risk of exposure.