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Retention tank, Marseille, France

To avoid discharging these effluents to the environment and to back up the Géolide wastewater treatment plant, the decision was taken to build the Ganay retention tank.

To design and build the huge backup tank (an impressively dimensioned cylinder with a diameter of 56 metres, built underground at a depth of 30 metres under the Ganay stadium, which can receive 50,000 m3 in one hour), Chantiers Modernes Sud and Campenon Bernard Sud-Est worked in a joint venture with Soletanche Bachy on the €43.7 million project.

The work will be completed at the end of 2017.