VolkerStevin has won a £23m enabling works contract from Thames Water ahead of the construction of London’s £4bn Thames Tideway Tunnel.
The announcement follows a seven-year site security deal for the new super sewer, which was won by G4S last week.
Enabling work, including a number of marine construction projects, began in August.
VolkerStevin managing director Rob Coupe said: “This is an exciting project and one we are proud to be a part of.
“After a successful early contractor phase, we are delighted to continue working on this important scheme, which will benefit Londoner’s for years to come.”
Thames Tideway chief operating officer Mark Sneesby said: “We are pleased to be working with VolkerStevin to deliver this important preparatory work in advance of the main tunnelling project next year.
“It’s great to see work actually beginning on what will be an exciting construction project.”
The first contracts on the £4.2bn super sewer were signed last month.
A Morgan Sindall JV with Bam Nuttall and Balfour Beatty (BMB) won the £416m package for the west section, while a Costain/Vinci Construction Grands Projets and Bachy Soletanche joint venture inked the £605m contract for works on the east section of the tunnel.
The 25 km tunnel, the biggest investment in London sewerage in 150 years, will capture wastewater and sewerage, transporting it to Beckton for treatment.