Can Hazardous Waste be Landfilled?

Hazardous wastes may only be deposited in "secure landfills", which provide at least 3 meters (10 feet) of separation between the bottom of the landfill and the underlying bedrock or groundwater table. A secure hazardous-waste landfill must have two impermeable liners and leachate collection systems that prevents the accumulation of leachate trapped in the fill and prevents environmental damage. To further reinforce against environmental contamination, an impermeable cap or cover is placed over a finished landfill.