| All landfills, including those not in use, produce landfill gases and leachate, or water that has permeated the surrounding soil. |
| Many of these are soluble in water and become dissolved in any surplus moisture in the landfill site to produce a liquid mixture termed leachate. |
| Then they poured distilled water into the columns and captured this leachate as it flowed out the bottom into flasks. |
| The leachate was collected and then chemically converted to true saltpeter, potassium nitrate, by mixing it with a solution of potash. |
| The residual material no longer produces methane, and leachate is much reduced. |
| True, leachate can lead to many lesser health problems and environmental effects that the EPA did not assess. |
