The RSPB is undertaking a huge development at Wallasea in Essex where they are using much of the 'spoil' from the Crossrail borings to increase the height of the island (http://www.theguardian.com/environment/2012/sep/17/crossrail-earth-wetland-nature-reserve). This will enable them to construct a system of lagoons that, it is hoped, will attract in substantial numbers of wading birds including Spoonbills. This seems an innovative use of 'waste'. It's certainly better than just creating a mound of soil and clay.
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