Desludging and cleaning stormwater basin BO1 in Arlon

Summary

The tender covers the complete desludging and cleaning of stormwater basin BO1 in Arlon to restore its hydraulic capacity and ensure normal operation. The work includes preparing the site, opening sections of the concrete walls to provide access and installing removable stainless-steel stop gates, pumping and removing the accumulated sludge, transporting it to authorised treatment facilities, and treating, recovering or disposing of it. The basin channels, walls, structures and equipment must also be cleaned, and water generated during the work must be managed. The estimated amount of sludge to be removed is approximately 1,500 tonnes, about 30% liquid and 70% solid; the actual quantity may vary. The contractor must provide all personnel, equipment, vehicles, pumping and suction equipment, transport and treatment resources needed. The work must address risks associated with confined spaces and potentially hazardous or explosive atmospheres, and comply with safety and environmental requirements. The work is to be carried out at the Arlon wastewater treatment plant and is planned to take 20 days. Bids must be submitted electronically in French by 10:00 on 13 November 2026 and remain valid for 150 days. Precise exclusion and qualification requirements must be checked in the tender documents.