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Rehabilitation of the sanitation networks on Esplanade Saint-Gervais in Rouen

SADE and SAT working well together!

The Rouen Normandie Metropolitan Authority has appointed a SADE (agent)-SOGEA consortium to rehabilitate the wastewater and stormwater networks on Esplanade Saint-Gervais in Rouen. This area on the banks of the Seine – used regularly for major events, such as trade fairs, funfairs, exhibitions, etc. – is now a huge construction site working to a tight timescale.

Comprehensive collection

The main objective is to be able to collect and pre-treat – by means of temporary connection points, a new network and associated works – all the wastewater generated during the events held on this site, for sending to the treatment plant. Stormwater collection will also be optimised.

Ad hoc design

A total of 49 units, each with 4 temporary connections, to give a total of 196 junction points, will be available for funfair operators and exhibitors. These will supply a ∅ 20 GRP network, comprising 2,840 linear metres (640 m of branch connections and 2,200 m of mains), the offshoots from which will lead towards a backflow station. Work on the site’s new sanitation system will also include the installation of fat separators, inspection holes and a water-gate chamber.

A backflow to behold

The backflow station is a GRP construction (∅ 1,600) buried 4.5 m down and fitted with two 40 m3/h pumps functioning on a 1+1 basis. It will send wastewater via a ∅ 125 HDPE pipe to a gravitational collector, located 600 m further on, right next to the magnificent Flaubert bridge.

Fat-busting!

In order to pre-treat wastewater full of substances used to cook chips, pancakes, waffles, churros, etc. 5 fat separators will be installed in the collection network. Made of stainless steel, these will be placed in a buried concrete construction (L 2.8 m x W 1.8 m x D 3.65 m) and will be accessible for maintenance via a cast-iron hatch.

Synergies

The Rouen Regional Division and SAT teams are working together on this site and sharing the same quarters. The former are responsible for all the civil engineering work, while our subsidiary is in charge of the entire stormwater network (625 m of three-layer polypropylene ∅ 400 tubes and 270 m of ∅ 315 tubes) and half of the wastewater network (1,390 m of ∅ 200 GRP and 600 m of ∅ 125 HDPE). It is a joint effort that began well in advance of the construction work, with SAT engineers having played an active role in the costing exercise required to respond to the call for tender.

A very tight timescale

It was the time allowed for the assessment and execution of the work that brought SADE, SAT and SOGEA together to respond to the call for tender. Having commenced on 15 March, all works must be accepted and signed off before 31 August, to allow for the resumption of festive events on the esplanade. The companies themselves are aiming for 14 July, so as to avoid having to stop work over the national holiday and then come back to finish up.

It is a collaborative effort that benefits all parties involved and an excellent demonstration of the adage that we are “stronger together”!

SAT in the spotlight

SAT (Société Auxiliaire de Travaux) was established in 1948 and joined the Groupe Générale des Eaux, by way of SFDE, in 1982 and then SADE in 1998. With a professional workforce of 50, SAT’s areas of expertise are drinking water and sanitation, in which it employs traditional as well as trenchless technology. Its main catchment area comprises the Seine-Maritime, Eure and Oise departments (www.satrouen.fr).

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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
  • REFERENCES
  • CSR
  • APPLICATIONS
  • NEWS
  • CONTACT

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]]