These special specifications relate to a contract which has as its object the periodic emptying of settling tanks-digesters, grease pits, scum pits, thickeners, etc. equipping all the wastewater treatment plants operated by AIDE, for a period of four years, renewable annually and tacitly, subject to proper execution of the services.

This contract is divided into five lots, corresponding to the following services:

- lot 1: Condroz sector.

Periodic emptying of settling-digesters, grease pits, scum pits, thickeners, etc. distributed among the five treatment plants concerned by the Condroz sector;

- lot 2: Ardennes sector.

Periodic emptying of settling-digesters, grease pits, scum pits, thickeners, etc. distributed among the 13 treatment plants concerned by the Ardennes sector;

- lot 3: Plateau de Herve sector.

Periodic emptying of settling-digesters, grease pits, scum pits, thickeners, etc. distributed among the 15 treatment plants concerned by the Plateau de Herve sector;

- lot 4: Hesbaye sector.

Periodic emptying of settling-digesters, grease pits, scum pits, thickeners, etc. distributed among the 18 treatment plants concerned by the Hesbaye sector;

- lot 5: OuVeA sector.

Periodic emptying of settling-digesters, grease pits, scum pits, thickeners, etc. distributed among the 16 treatment plants concerned by the OuVeA sector.

Periodic emptying of settling-digesters, grease pits, scum pits, thickeners, etc. distributed among the five treatment plants concerned by the Condroz sector.

Periodic emptying of settling-digesters, grease pits, scum pits, thickeners, etc. distributed among the 13 treatment plants concerned by the Ardennes sector.

Periodic emptying of settling-digesters, grease pits, scum pits, thickeners, etc. distributed among the 15 treatment plants concerned by the Plateau de Herve sector.

Periodic emptying of settling-digesters, grease pits, scum pits, thickeners, etc. distributed among the 18 treatment plants concerned by the Hesbaye sector.

Periodic emptying of settling-digesters, grease pits, scum pits, thickeners, etc. distributed among the 16 treatment plants concerned by the OuVeA sector.