West Ruislip portal schedule update

From

Last October we notified you that we would be carrying out excavation works overnight at our West Ruislip site from 8 November to 17 December 2021.
However, we now need to continue with these works until 13 February 2022 to prepare the base of the railway tunnels.  
 
There will be two separate occasions where fifty hours of continuous cement pour is required. This will be used to build the two base slabs for the portal structure and has to be continuous so that there is no adverse effect on the structural integrity of the building.  One of these weekends will be in February.
We will be excavating to prepare the area for the launch of the Tunnel Boring Machines (TBMs) and the creation of the portal area.

The earth excavated from this area will be stored temporarily at the golf course driving range. This stockpiled earth will then be used to landscape the area around the tunnels and the tunnel entrances once the construction works have been completed. In the TBM storage area we will be building a tent to minimise noise from the initial welding works required for the construction of the cutter head.
There will be two separate occasions where fifty hours of continuous cement pour is required. This will be used to build the two base slabs for the portal structure and has to be continuous so that there is no adverse effect on the structural integrity of the building.

The area of activity is shown on the map https://www.hs2.org.uk/work-items/update-on-night-works-at-west-ruislip-2/

Work mitigation
We will:
• Continue to monitor sound levels both inside and outside our site compound
• Carry out attended monitoring for the first two weeks to ensure noise and vibration levels are within our required limits
• Carry out steel fixing works only at the very bottom of the excavation, 11 meters below ground level
• Use acoustic covers and blankets where possible
• Limit cutting and welding to daytime hours (8am to 6pm)
• Use dust mist cannons around the working areas
• Face lighting away from residential properties.

We would like to apologise in advance for the disruption or inconvenience this may cause. Every effort is being taken to ensure that these works are carried out in the least impactful way. We will ensure that disruption is kept to a minimum.