What is the recommended final cover thickness at a landfill?

The recommended final cover thickness at a landfill is typically established to ensure effective sealing and protection of the waste beneath. A thickness of 24 inches is considered appropriate because it provides sufficient material to manage water infiltration, controls gas emissions, and supports vegetation growth, all of which are crucial for long-term stability and environmental protection.

This thickness helps to prevent erosion and allows for the establishment of a proper drainage system, thereby minimizing the potential for leachate formation and contamination of surrounding areas. Additionally, a 24-inch cover can accommodate the necessary soil compaction and ensure that the final landform is stable while also complying with regulatory standards.

The other options, while they may seem plausible, do not align with the commonly accepted practices for landfill cover thickness, which prioritize both ecological safety and structural integrity over less substantial thicknesses.