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Best Practices for Hazardous Waste Landfills

• All new hazardous waste landfills or lateral extensions of old ones must have two or more liners, and a leachate collection and removal system above them and between each of the liners. A single liner is only used in very special situations and then only with the written permission of the authorizing authority after reviewing the situation on site.

  • • Do not place any bulk or non-containerized liquid hazardous wastes in the landfill.
  • • The concentration of the hazardous waste, quantity, and type must be clearly identified and recorded before placing in a land area.
  • • Incompatible wastes must never be stored together in the same land treatment area.
  • • No food crops must ever be grown in the area where hazardous waste has been put into a landfill.
  • • No animal grazing or anything else associated with food production can be done in this area.
  • • Future owners of the property must be notified in the property deed that the site was used for hazardous waste disposal.
  • • Prepare a plan for a system of monitoring in the zone of aeration of the groundwater supply. The plan must detect any vertical migration of the hazardous waste or any of its constituents; provide information concerning the background concentration of the hazardous waste or any of its constituents in the soil close to the source of water; and incorporate the use of appropriate soil testing techniques at depths below where the waste was placed in the soil and should consist of soil cores and appropriate instruments to monitor the soil pore water with a frequency of testing based on the frequency, time, and rate of waste application. All this information must be kept in a permanent logbook for review by the authorizing authority. Along with this must be a plan for closure and postclosure of that area which will include means of control of migration of hazardous waste and its constituents into the groundwater; means of control of release of contaminated runoff from the facility into surface water; means of control of the release of airborne particulate contaminants because of wind erosion; and means of preventing growth of food or use by cattle of the contaminated area.
  • • After closure of a given area, there must be a plan for removal and treatment of contaminated soils, and placement of final covering material including appropriate use of vegetation; continued monitoring of groundwater and runoff management of the area; and control of the migration of landfill gas and leachate and all necessary treatment.
  • • Observe all current rules and regulations of state and federal authorities. These tend to change over time and it is the responsibility of the owner and operator of the landfill to know about the changes and carry out the necessary actions.
 
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