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Align, the joint venture that includes Bouygues Travaux Publics, Sir Robert McAlpine and VolkerFitzpatrick, is constructing HS2’s longest tunnels stretching 16km under the Chilterns Hills in the UK. Chalk excavated from the tunnels is being used to landscape Align’s South Portal site which is set to become a 127 hectare wildlife haven featuring new chalk grassland, woodland, wood pasture and wetland habitats. Chalk grassland – a type of calcareous grassland – is a habitat of international conservation importance mainly found on limestone and chalk downlands of south-east England and the Isle of Wight. 

Transformation of what is HS2’s largest construction site has reached a major milestone with the first million cubic metres of chalk having been laid on site.

 

Did you know ?

The ambitious environmental project will eventually see 2.6 million cubic metres of chalk excavated during the construction of the Chilterns tunnels used to create one of the largest areas of chalk grassland in the Chilterns hills

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