Land treatment unit
A land treatment unit (LTU) is a location in which land is treated, usually through
bioremediationprocesses, to reduce the toxicityof the soil.
LTUs are becoming more common as more sites needing clean-up are identified.
Land treatment units are areas where
hazardous wasteis applied or incorporated into the soil surface. Land treatment units are typically units consisting of natural soils where natural biological and chemical degradation and attenuation processes immobilize, transform, or degrade hazardous constituents over time. 
Land disposal unit
[http://www.epa.gov/compliance/resources/policies/civil/rcra/wasteanalygman-rpt.pdf] Waste Analysis at Facilities that Generate, Treat, Store, and Dispose of Hazardous Waste, A Guidance Manual US EPA (OSWER 9938.4-03)
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