Hazardous waste piles are piles of solid hazardous waste which are not in any type of container, do not contain liquid, and are therefore considered temporary storage.

Best Practices for Hazardous Waste Piles

  • • Install a double liner and leachate collection and removal system.
  • • Install a second leachate collection and removal system above the top liner.
  • • Install run-on and runoff controls for water and prevent wind dispersal of waste.
  • • Upon closing a waste pile, the entire residue, contaminated soils, and equipment must be removed or decontaminated.

Land Treatment Units

(See endnote 97)

Hazardous waste is applied directly to the soil surface or mixed in with the upper layers to promote degradation, transformation, or immobilization of the hazardous materials. The physical, chemical, and biological processes in the top layers of soil denature and decompose the hazardous waste. Before waste can be placed here, the owner and operator have to show to the authorizing authority that the unit will work in the treatment of the hazardous waste.

Best Practices for Land Treatment Units

  • • Once the unit is in operation, the operator must monitor the unsaturated zone using procedures which have already been identified.
  • • The operator must demonstrate that all hazardous materials are receiving adequate treatment.
  • • When the unit is being closed, a vegetative cover must be put around and above it.
  • • The operator must continue to monitor the unit and show that the hazardous materials in the treatment zone are not exceeding background levels.
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