Thames Water has gone out to tender with a major contract for construction work at its Mogden Sewage Treatment Works worth an estimated £70 million.

The wide-ranging contract to design, construct and commission resilience works to the existing Mogden Sewage Treatment Works (STW) covers work to:

• improve the capacity of preliminary treatment
• improve the resilience and capacity of primary and secondary treatment
• improve the resilience of the Sludge and Digester Streams and prepare them for AMP8 work
• provide additional onsite energy generation
• enable the works to meet its flow and quality consent for population growth.

Mogden is the second largest STW in the Thames region and the country, with a catchment area in the west of London which stretches from Chiswick to the north and west of Heathrow Airport.

The design flow to full treatment capacity is 1 064 Mld. The works which are the subject matter of this contract opportunity are to provide for growth, resilience and consent compliance to a design horizon of 2 036 with the population equivalent (PE) projected to be 2.4 million; the contract will also include related planning, design and engineering services.

The scope of the project comprises the following activities:

• Upgrades to the inlet pumping station and preliminary treatment to provide capacity, resilience and protection to downstream processes, including:
• Capital maintenance improvement works on the East Side Primary Settlement Tanks (PSTs) 1-8.
• Capital maintenance work and improved process control, to increase the resilience of the activated sludge plants (ASPs)
• New sludge treatment facilities to increase capacity, improve asset reliability and provide resilience.
• Other works to upgrade the capacity of the existing systems for the 2036 growth scenario.

Thames Water will be holding a webinar to help applicants understand technical aspects of the requirements at 10 am on 16 June 2020. Organisations who express an interest in the project and requesting a pre-qualification questionnaire will be sent a link for the webinar.

Contract award is expected to be May 2021 and the project is required to be complete by March 2025, unless the options for AMP 8 works are instructed.

Time limit for receipt of tenders or requests to participate is 1^st July 2020 – click here to access the tender documentation.

Want to know more about winning new business in AMP7? The water companies in England and Wales are set to spend a record £51 billion in the next five years.

Our  new report Complete AMP7 Contracts Tier 1 Alliances and Tier 1 Contractors 2020-25 contains details of the companies, the alliances, the contracts they’re already working on in the UK water sector, together with hundreds of key named contacts - click here for more information.