SWMUSolid Waste Management Unit
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One-time spills are considered subject to 3004(u) corrective action only if the spill occurred from a SWMU.
Types of units which therefore are included in the definition of SWMUs include landfills, surface impoundments, waste piles, land treatment units, incinerators, injection wells, tanks, container storage areas and transfer stations.
In addition, certain areas associated with production processes at facilities which have become contaminated also are considered to be SWMUs.