In which type of landfills are double liner systems employed?

The use of double liner systems is specifically mandated in Subtitle C landfills. These landfills are designed for the disposal of hazardous waste, which requires stringent engineering and environmental protection measures to prevent contamination of soil and groundwater. The double liner system consists of two barriers beneath the landfill, typically made of materials like high-density polyethylene, that work in conjunction to contain leachate, which can be harmful to the environment.

The robust design of Subtitle C landfills helps ensure that any leachate that may escape from the waste material is caught by the second liner and directed to a leakage collection and removal system. This meticulous approach aims to protect human health and the environment from the dangers posed by hazardous materials, making the double liner system an essential component of Subtitle C landfill management.

Other types of landfills, such as Subtitle A, B, and D landfills, have different regulatory requirements and typically do not necessitate double liner systems because they handle non-hazardous or less environmentally threatening waste.