Under the Resource Conservation and Recovery Act (RCRA), Land Disposal Restrictions (LDRs) require what before disposal of hazardous waste?

• A. Set treatment standards to reduce toxicity prior to land disposal.
• B. Regulate air emissions from disposal sites.
• C. Require recycling metrics for nonhazardous waste.
• D. Specify groundwater monitoring frequency.

Answer: (A)

Hazardous waste must be treated to meet established standards to reduce its toxicity or mobility before it can be disposed of on land. This requirement, part of the Land Disposal Restrictions, ensures that the waste is treated so its hazardous constituents are less likely to contaminate soil or groundwater once land-disposed. The standards are specific to the waste code and typically involve processes that lower leachability or overall toxicity to defined limits. Only after meeting these treatment standards can disposal on land occur; otherwise the waste must undergo further treatment or be managed elsewhere. Other regulatory ideas like controlling air emissions from disposal sites, tracking recycling metrics for nonhazardous waste, or specifying groundwater monitoring frequency are separate aspects of environmental regulation and not the pre-disposal treatment mandated by LDR.