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- Title
LANDFILL FINAL COVER AND MANAGEMENT OF LEACHATE SEEPS BELOW FINAL COVER.
- Authors
Khatami, Ali
- Abstract
Leachate seeping out of landfill slopes is a common occurrence at landfills. Generally, after closure of a portion of the landfill slope, the issue of leachate seeps that was problematic and bothersome prior to the closure is completely forgotten because leachate seeps are no longer visible. The general perception is that the seeps automatically disappear because the closure prevents rainwater from entering into the landfill. This perception may be true if the source of water leading to the seep is within the closed area; but if the source is in an area other than the closed area, the seep underneath the final cover geomembrane continues for a much longer period of time until the actual source is covered by geomembrane at a later date, and this later date could be many years or several decades into the future. In the meanwhile, the seeped liquids pond below the final cover geomembrane at the toe of the slope and potentially create an unstable situation for the slope. To address this issue, a leachate toe drain system may be installed. A leachate toe drain system collects and disposes of liquids flowing down the slope underneath the cover geomembrane. The leachate toe drain system is connected to the nearby leachate collection pipe cleanouts and/or nearby primary sump riser for removal of liquids through the leachate collection sumps.
- Subjects
LAND cover; LEACHATE; GEOMEMBRANES; LANDFILL closures; WASTE management
- Publication
Journal of Solid Waste Technology & Management, 2015, Vol 41, Issue 4, p62
- ISSN
1088-1697
- Publication type
Article