Abu Dhabi Sewerage Services Company (ADSSC) has set a revised closing date of October 15 for the estimated AED2bn ($572m) contract to build a pumping station on its Strategic Tunnels Enhancement Programme (Step).

Contractors were originally due to submit bids in late September but the closing date has been extended to give bidders more time.

The prequalifiers include:

• Bouygues, France;
• Vinci Construction Grand Projets, France;
• Lindenberg-Emirates, local;
• Odebrecht, Brazil;
• Samsung Corporation, South Korea; and
• Al-Habtoor Leighton Group, locxal/Australian

ADSSC has awarded one construction contract and selected preferred bidders for two contracts on the three tunnel packages on the Step scheme (MEED 13:9:09).

Italy’s Impregilo was awarded in the first week of September the AED891m contract to build the middle section of the 40-kilometre-long tunnel that will take sewage from Abu Dhabi Island to treatment plants at Al-Wathba, outside Abu Dhabi city.

ADSSC has also picked Impregilo as the preferred bidder for a second package estimated at AED785m, which involves the construction of a 15.6km, 5-metre-diameter tunnel between Mafraq and Al-Wathba.

South Korea’s Samsung Corporation is the preferred bidder for the third package, estimated to be worth AED1.1bn, to dig the 16.1km, 4-metre-diameter tunnel from Abu Dhabi Island to the Mussafah area.

US-based CH2M Hill is the programme manager for the entire scheme.