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Select committee orders HS2 ground movement review for Hillingdon

Department for Transport lead counsel Timothy Mould has told the HS2 select committee that errors have been discovered in sections used during petitioning from a Hillingdon resident.

The error on the cross-section, which gave a dimension between the running tunnel closest to the petitioner’s property and the surface of the ground, was revealed during a later evidence session.

“We have, I regret to say, discovered that that dimension as shown on that exhibit was incorrect, and it exaggerated the distance between the running tunnel and the surface of the ground,” said Mould. “The reason why that has happened is because the surface of the ground has been shown at a higher level AOD than is in fact the case.”

Mould said that an apology had been issued to the petitioner and an investigation has been ordered to review the evidence and the assessment in relation to all petitioners who have also raised concerns about ground settlement and who have been shown similar exhibits.

“I’ve asked that that work be given the highest priority and the greatest urgency, and we will report both to those petitioners and to any other petitioners who have yet to be heard who are in a similar position, and also report back to the committee,” said Mould. “We will also check that the settlement assessment which you’ll recall was shown on the contour plans is correct. We believe it to be correct.”

Ground-borne noise and vibration assessments are also to be checked.

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