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2.6km underground for wastewater…

February 19, 2021

on a big project for Bordeaux Métropole with the SADE Special Works teams.

Two project aims

  • Increase the treatment capacity of the Cantinolle and Lille wastewater treatment plants, located in Eysines and Blanquefort respectively, in response to the growing population of these two municipalities;
  • Preserve the sensitive natural environment of the River Jalle by discharging treated water into the River Garonne, which has a higher flow rate.

The works

Since August 2020, 18km of additional networks have been built to link these two wastewater treatment plants located in the Bordeaux metropolitan area and enable the transfer of wastewater from Cantinolle to the Lille plant.

Two parallel pipes are currently being laid along 9km each, including around 2.6km laid using an 800mm-diameter micro-tunneller.

The STS – Valentin consortium (agent) is carrying out this section of trenchless works.

Several reasons explain the choice of the micro-tunnelling technique for this section:

  • Passages under departmental roadways and railway lines
  • Proximity to Padouens Lake, a few metres from the worksite, implying a strong presence of water and unstable ground unsuited to conventional open excavation works.

The drilling plan required seven entry shafts and eight exit shafts, all located at a distance of 100m from each other.

At this stage of the works, 5 drilling operations of over 100m have already been executed, out of a planned total of 25, including beneath railway lines.

Works are scheduled to continue to August 2022.

The Jalle de Blanquefort, also known as the Jalle Noire is one of the left bank tributaries of the River Garonne.
The waterway flows through marshes and wetlands which represent an outstanding natural and landscape heritage.

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23-25 av. du Docteur Lannelongue
75014 Paris

  • IN BRIEF
    • Profile
    • Anchoring
    • Path
  • PROFESSIONS
    • Systems
    • Infrastructure
  • SERVICES & SOLUTIONS
    • Regional authorities
    • Industries
    • Major infrastructures
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Legal notice Ι Anticorruption code of conduct Ι Occupational gender equality index Ι Personal Data Protection Policy Ι Suppliers relationship © 2021 All rights reserved

Fraud Warning

It has come to our attention that emails have been sent by individuals falsely claiming to be SADE employees. The objective of these emails is to place false orders using our company’s name. Read more…

In the emails detected to date, the fraudsters are writing from the addresses “[email protected]” or “[email protected]”. They use our logo and Paris 75014 address.

We wish to draw your attention to the fact that these email addresses do not correspond to SADE’s email address, which bears the domain name sade-cgth.fr.

We thus advise caution in your communication and request that you do not exchange documents or information with persons other than your usual contacts at SADE. If you are in any doubt, we advise you to speak to your usual contacts prior to the transmission of any document or information.

As fraudsters regularly change their operating mode, we also recommend you alert all your employees likely to have dealings in this area (purchasing, accounting or payroll, etc.).

SADE systematically lodges an official complaint in response to such acts. We would be grateful if you could notify us at the following address of any contact you may have had with individuals claiming to be employees of our company: [[email protected]]