Thames Water has yet again extended the deadline to tender for its £400 million AMP8/9 Coppermills WTW contract - by a further two weeks from 18 March to 12.00 pm on 2nd April 2024.
The original tender deadline was first extended from 16th February 2024 at 12 noon, to 18 March 2024, at 12 noon. Thames Water also intends to amend the Contract Terms to significantly reduce the risk and liability for any successful tenderer.
The Coppermills project includes the following packages of work:
i. A new circa 700 Ml/d High Lift Pumping Station (HLPS)
covers the design, construction, and commissioning of a new High Lift Pumping Station (HLPS) and decommissioning of the existing HLPS for Coppermills Advanced Water Treatment Works (AWTW). The package will involve the construction of a modern, energy efficient, and resilient pumping station in the footprint of an existing slow sand filter in the centre of a busy operational site. The new HLPS building will feature a basement and superstructure to house the new VSD controlled high lift pumps, surge suppression equipment, electrical systems, and Heating, Ventilation, and Air Conditioning (HVAC) plant.
The package also include logistically and technically complicated connections and modifications to the existing contact tank(s) and the existing HLPS outlet and inlet manifolds, as well as connection to the Thames Water Ring Main. The works will include the development and implementation of a comprehensive Supervisory Control and Data Acquisition (SCADA) upgrade along with a new instrumentation and control system to optimise the overall operational efficiency of the new HLPS.
ii. A new circa 260 Ml/d Slow Sand Filter (SSF) Recirculation and Run-to-Waste system
Covers the design, construction, and commissioning of a new recirculation and run-to-waste system for 32 existing SSFs at Coppermills AWTW, including the construction of 16 below ground SSF recirculation/run-towaste pumping stations with submersible pumps, associated pipework, valves, instruments, and fittings. Sophisticated flow control and monitoring system will be implemented, featuring 32 flow control valves, flowmeters, and sampling points on each SSF outlet. The package will also include the construction of new connections and a discharge pipework to the head of the works and Walthamstow Reservoir No. 3 via Tunnel C culvert.
iii. A new cryptosporidium treatment system to treat SSF filtrate for Cryptosporidium inactivation
Covers the design, construction and commission of a new cryptosporidium treatment system to treat SSF filtrate at Coppermills AWTW. The requirements are currently being developed by Thames Water - the successful contractor will need to work collaboratively with Thames Water to help develop the requirements.
iv. A new circa 50 Ml/d contact tank draindown pumping station and dechlorination system
Requirements for the contact tank draindown system are currently still being developed.
Thames Water said the project will require a high level of civil, mechanical, electrical, process, operational, and construction planning and management expertise to ensure successful delivery.
Contract term is 128 months - click here to access tender documentation
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