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A land disposal unit, or LDU, is a site in which hazardous waste is remedied through natural and man-made processes. "Land disposal" of hazardous waste is defined in the U.S. Resource Conservation and Recovery Act (RCRA). Types of LDUs for hazardous waste disposal:

• Landfill
• Surface impoundment
• Waste pile
• Land treatment unit
• Injection well
• Salt dome formation
• Salt bed formation
• Mine
• Cave.

References

1. United States. Resource Conservation and Recovery Act. Section 3004(k), "'Land disposal' defined." 49 U.S.C. § 6924.
2. Land Disposal Restrictions: Summary of Requirements (Report). Washington, D.C.: U.S. Environmental Protection Agency. August 2001. EPA 530-R-01-007.

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