Liège -Airport – Lemaire quarry rehabilitation

Rehabilitation of an old tertiary-sand quarry within the scope of the extention works for the Liège-Bierset airport.

The 170 000 m³ of waste, partially filling in the quarry, mainly consists in coal deads (130 000 m³) as well as in various waste from the construction sector (40 000 m³).

The waste have been maintained in place thanks to the works below:

• discharging the suspicious or unwilling components in a registered garbage dump,
• setting up a chalk layer on the current backfills in order to increase the percolating water pH,
• backfilling and streamlining the quarry with alluvium (200 000 m³),
• setting up a waterproof layer linked with the peripheral drain under the silt layer in order to limit the percolation,
• construction of a peripheral drain that catches the runoff water, linked with a new storm basin,
• enhancing the landscape value.