When constructing natural soil liners, how thick are the lifts typically compacted?

When constructing natural soil liners, the lifts are typically compacted to a thickness of 6 inches (15 cm). This thickness allows for effective compaction to achieve the desired density and permeability required for the liner's performance. Compacting lifts that are too thick can result in insufficient compaction, leading to potential voids and inconsistencies in the liner, which can compromise its ability to act as a barrier to leachate and gases.

Additionally, a lift thickness of 6 inches is manageable for achieving uniformity, ensuring that equipment can adequately apply the necessary pressure for compaction throughout the layer. This standard practice is based on industry guidelines and engineering principles aimed at enhancing the effectiveness of the landfill liner system while ensuring proper installation and long-term stability.