In 1984, RCRA was amended to require __ or the equivalent, at hazardous waste landfills.

In 1984, the Resource Conservation and Recovery Act (RCRA) was amended to enhance the regulations surrounding the treatment, storage, and disposal of hazardous waste. One of the significant changes made by this amendment was the requirement for hazardous waste landfills to have double liners. This measure was intended to provide additional protection against leaks and ground contamination by creating two separate barriers that any potential leakage must penetrate before reaching the environment.

The double liner system serves as a critical safety feature, ensuring that if waste were to leak through the primary liner, the secondary liner would provide an additional layer of containment, reducing the risk of hazardous materials reaching groundwater or soil. This amendment reflects a growing awareness of the potential environmental risks posed by inadequately managed hazardous waste and aims to ensure better long-term safety and environmental protection.

Although auxiliary incinerators and EPA coordinators are related concepts within the context of hazardous waste management, they do not specifically address the requirements imposed on landfills by the 1984 RCRA amendments. Therefore, while these options may reflect other aspects of hazardous waste management practices, they are not directly tied to the requirement for double liners.