Landfill Liners from Top to Bottom

by Robert M. Koerner, (M.ASCE), Dir.; Geosynthetic Research Institute, Drexel University, Philadelphia, PA 19104,
David E. Daniel, (M.ASCE), Prof.; Civ. Engrg. Dept., University of Texas, Austin, TX,


Serial Information: Civil Engineering—ASCE, 1991, Vol. 61, Issue 12, Pg. 46-49


Document Type: Feature article

Abstract:

Since EPA began requiring geomembrane liners in 1982, liner system components have multiplied rapidly. At the same time, there has been a movement toward relatively large, sophisticated, regionally based landfills that must comply with increasingly strict local, state and federal regulations. Because these facilities contain wastes that produce enough leachcate to be harmful if it became fugitive, a conservative containment strategy is warranted. Many experts believe that a double-composite liner system is the minimum standard of care to which future landfills that can produce significant quantities of threatening leachate should be held. A state-of-the-art double-composite liner system has four major segments: (1) leachate collection system; (2) primary liner; (3) leak detection system; and (4) secondary liner. These major segments are made up of nine layers. A 10th layer, the soil or rock subgrade, completes the system.

Subject Headings: Linings | Landfills | Leachates | Waste containment | Subgrades | Subgrade soils | Rocks

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