Surface Impoundment

{
  "id": "MLC-T-ENV-027354",
  "term": "Surface Impoundment",
  "field": "Environment",
  "definition": "1. Treatment, storage, or disposal of liquid hazardous wastes in ponds.\n\n2. A natural topographic depression, man-made excavation, or diked area formed primarily of earthen materials that is used to treat, store, or dispose of hazardous waste.\n\n3. Unit that is a natural topographical depression, man-made excavation, or diked area formed primarily of earthen materials (although it may be lined with man-made materials), which is designed to hold an accumulation of liquids. Examples of surface impoundments include holding, storage, settling, and aeration pits, ponds, and lagoons. [40 CFR 63.7957 (CFR 2013)] [40 CFR 63.681 (CFR 2013)]\n\n4. Facility or part of a facility which is a natural topographic depression, man-made excavation, or diked area formed primarily of earthen materials (although it may be lined with man-made materials), which is designed to hold an accumulation of liquid wastes or wastes containing free liquids, and which is not an injection well. Examples of surface impoundments are holding, storage, settling, and aeration pits, ponds, and lagoons.\n\n5. Waste management unit which is a natural topographic depression, manmade excavation, or diked area formed primarily of earthen materials (although it may be lined with manmade materials), which is designed to hold an accumulation of liquid wastes or waste containing free liquids. A surface impoundment is used for the purpose of treating, storing, or disposing of wastewater or residuals, and is not an injection well. Examples of surface impoundments are equalization, settling, and aeration pits, ponds, and lagoons. [40 CFR 63.1251 (CFR 2013)]\n\n6. Natural topographic depression, man-made excavation, or diked area formed primarily of earthen materials (although it may be lined with man-made materials) that is not an injection well.\n\n7. A topographic depression, excavation, or diked area, primarily formed from earthen materials (lined or unlined) and designed to hold accumulated liquid wastes, wastes containing free liquids, or sludges that were not backfilled or otherwise covered during periods of deposition; depression may be dry if deposited liquid has evaporated, volatilized or leached, or wet with exposed liquid; structures that may be more specifically described as lagoon, pond, aeration pit, settling pond, tailings pond, sludge pit, etc.; also a surface impoundment that has been covered with soil after the final deposition of waste materials (i.e., buried or backfilled).\n\n8. Natural or man-made topographic depression with a dammed location that is primarily made of earthen material and used to volatilize and/or settle materials.",
  "subject": "Land, waste and cleanup",
  "references": [
    "RCRA Glossary of Terms; Terms of Environment",
    "RCRA Orientation Manual 2008 Glossary; RCRA Glossary of Terms",
    "40 CFR 63.941 (CFR 2013)",
    "40 CFR 260.10 (CFR 2013)",
    "40 CFR 63.1361 (CFR 2013)",
    "40 CFR 280.12 (CFR 2018)",
    "Hazard Ranking System Glossary",
    "Effluent Limitations Guidelines (ELG) Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/surface-impoundment/"
}