| The residual material no longer produces methane, and leachate is much reduced. |
| Devices called lysimeters are sometimes inserted into the ground to collect subsurface water, called leachate. |
| The leachate was collected and then chemically converted to true saltpeter, potassium nitrate, by mixing it with a solution of potash. |
| All landfills, including those not in use, produce landfill gases and leachate, or water that has permeated the surrounding soil. |
| True, leachate can lead to many lesser health problems and environmental effects that the EPA did not assess. |
| The treatment of leachate and the safe disposal or even use of landfill gas are components of an environmentally sound waste management policy. |
