Division 3.3
United Kingdom
In addition to the geological barrier described above a leachate collection and sealing system must be added in accordance with the following principles so as to ensure that leachate accumulation at the base of the landfill is kept to a minimum:
Leachate collection and bottom sealing
| Landfill category | non hazardous | hazardous |
|---|---|---|
| Artificial sealing liner | required | required |
| Drainage layer ≥ 0,5 m | required | required |
Member States may set general or specific requirements for inert waste landfills and for the characteristics of the abovementioned technical means.
If the competent authority after a consideration of the potential hazards to the environment finds that the prevention of leachate formation is necessary, a surface sealing may be prescribed. Recommendations for the surface sealing are as follows:
| Landfill category | non hazardous | hazardous |
|---|---|---|
| Gas drainage layer | required | not required |
| Artificial sealing liner | not required | required |
| Impermeable mineral layer | required | required |
| Drainage layer > 0,5 m | required | required |
| Top soil cover > 1 m | required | required. |