Lee Tunnel Cost Verification


Thames Tideway and OFWAT

About the project

The Lee Tunnel (East Ham to Stratford deep tunnel) is part of the Thames Tideway Scheme and runs from Abbey Mills Pumping Station to Beckton Sewage Treatment Works. The tunnel is 6.9km long and captures 16,000,000m3 of sewage annually from the single largest polluting Combined Sewer Overflows in London.

Services on this £635million project included independent verification of the commercial elements of the project for OFWAT, and a detailed review and interrogation of the basis of estimating, risk management procedures and allocation of risk between Thames Water and OFWAT. The commission also involved an audit of the procurement process and negotiation of an acceptable cost to include in the price determination, along with risk analysis and profiling.