Sewage-treatment plant construction work

Tender description

Design, construct and commission a new Sewage Treatment Works (NSTW) in Guildford including connections to existing sewer network, gravity fed tunnel and pumping station, de-commissioning of the existing STW (ESTW) with the scope summarised as follows: • full design including development to support TW obtain planning permission, • activated Sludge Process (ASP) – complete new build, • gravity fed tunnel to defined corridor connecting to inlet pumping station, • connection to sewer network, • commissioning of NSTW, • de-commissioning of ESTW. Contract award is expected to be May 2021 and the project is required to be complete by December 2025. The contractor will be required to carry out the works without adversely impacting on the integrity of the existing STW and to design the Works to achieve the Environmental permit. Guildford STW relocation is a complex major project that is to the benefit of both Thames Water Utilities Ltd (TW) and Guildford Borough Council (GBC). It constitutes an opportunity for TW to support GBC, playing a key part in GBC’s Weyside Urban Village housing development, positively impacting on the local plan to meet growth and housing demands, and improving the local environment. TW’s existing STW (ESTW) occupies a site that GBC wish to redevelop to provide additional local housing to achieve part of its planning objectives. The project requires the design and construction of a new STW (NSTW) located on a site to the north of the neighbouring Slyfield Industrial Estate. The NSTW will be connected to the local sewer network through a gravity fed tunnel to the works. Once the NSTW is complete, the ESTW will be decommissioned allowing the ESTW land to transfer to GBC. The works additionally comprise minor enabling works to facilitate the land transfer.