The bubbling puddles above an HS2 tunnel site are back.
The ground here is London clay with sand on top and that is causing the boring machines problems.Ruislip Rugby Club is a friendly, community-based club. It has found itself at the centre of a lot of media attention as, just on the edge of its pitches, the biggest engineering project in Europe has hit problems.
Environmental campaigners are concerned about what was in the liquid seen on 20 March. HS2 has said previously it was air and water and it is safe.He has concerns about what is happening to the rocks below, which store water and are known as aquifers, and wants HS2 work suspended by the Environment Agency."Ten years go when we started on the consultation with HS2 and the Environment Agency, we were very concerned that the aquifer would be damaged by what goes on within the tunnel.
The problems in Ruislip have meant HS2 have switched tunnelling fluid, which it hopes is better suited to the mixed ground.The site of a previous bubble pit is still cordoned-off, although the liquid has sunk On the issue with the grout, they added: "A grout leak has taken place during our tunnelling operations. We apologise for the error. After liaison with the Rugby Club, the grout was cleaned up. The area has been temporarily fenced-off and remains safe."
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