In total, 92,000m3 of spoil were excavated from the underground structures on both sites. The excavated material was analysed on the surface to check its quality and the spoil polluted by hydrocarbon was managed accordingly. On the Meyrin site, much of the excavated material will be reused to create a platform on which to erect the surface buildings. The rest will be taken to a treatment centre. At Cessy, almost all the excavated material will be taken to inert waste storage facilities located less than 20 km from the worksite, to limit the transport distance. On both sites, the topsoil will be reused for landscaping.
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