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Lower Thames Crossing Options: Output 2 Design & Costing Report

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Lower Thames Crossing Options: Output 2 Design & Costing Report April 2013 Review of Lower Thames Crossing Options: Output 2 Design & Costing Report Prepared by: ....................................................... Checked by: .................................................................. Richard Lyon Ian Burrows Associate Director Regional Director Approved by: ....................................................... Paul Hanson Regional Director Review of Lower Thames Crossing Options: Output 2 Design & Costing Report Rev No Comments Checked Approved Date by by 8 Published IB PH 25-04-13 7 Draft Final Version IB PH 18-04-13 6 Draft Final version including client comments CLB/ RL PH 22-03-13 5 Revised Draft version 2 IB PH 08-02-13 4 Revised Draft version 1 IB PH 13-12-12 3 Revised chapters 1 and 2 IB PH 14-09-12 2 Second draft issue with cost information JW PH 17-08-12 1 First draft issue; excludes cost and risk information JW IB 20-07-12 Saxon House, 27 Duke Street, Chelmsford, Essex, CM1 1HT Telephone: 01245 771200 Website: http://www.aecom.com Job No 60249197 Reference Output 2: Design and Costing Report Date Created April 2013 This document has been prepared by AECOM Limited for the sole use of our client (the “Client”) and in accordance with generally accepted consultancy principles, the budget for fees and the terms of reference agreed between AECOM Limited and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM Limited, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM Limited. Although this report was commissioned by the Department for Transport (DfT), the findings and recommendations are those of the authors and do not necessarily represent the views of the DfT. The information or guidance in this document (including third party information, products and services), is provided by DfT on an 'as is' basis, without any representation or endorsement made and without warranty of any kind whether express or implied. Table of Contents Volume 1 Executive Summary ...................................................................................................................................................... i 1 Introduction ...................................................................................................................................................... 6 1.1 Purpose of Report ................................................................................................................................. 6 1.2 Overall Approach .................................................................................................................................. 6 1.3 Report Structure .................................................................................................................................... 6 2 Approach to Identifying Constraints ............................................................................................................. 8 2.1 Introduction............................................................................................................................................ 8 2.2 Environmental Constraints .................................................................................................................... 8 2.3 Planning Constraints ........................................................................................................................... 11 2.4 Engineering Design Constraints ......................................................................................................... 12 3 Approach to Design ...................................................................................................................................... 14 3.1 Introduction.......................................................................................................................................... 14 3.2 General Design Requirements ............................................................................................................ 14 3.3 Design Process ................................................................................................................................... 15 3.4 Road Capacity Design Assumptions ................................................................................................... 15 3.5 Design Assumptions for Roads and their Compliance with Standards .............................................. 16 3.6 Conceptual Design Assumptions for Bridge Structures ...................................................................... 18 3.7 Conceptual Design Assumptions for Tunnel Structures ..................................................................... 19 3.8 Other Design Issues ............................................................................................................................ 22 4 Approach to Estimating Capital Costs ........................................................................................................ 23 4.1 Introduction.......................................................................................................................................... 23 4.2 Overall Approach ................................................................................................................................ 23 4.3 Composition of Capital Costs .............................................................................................................. 24 4.4 Methodology used to Estimate Construction Costs ............................................................................ 25 4.5 Methodology used to Estimate Options and Development Phase Costs ........................................... 26 4.6 Approach to Quantifying the Cost of Risk ........................................................................................... 26 4.7 Inflation, Programme Risk and Range Narrowing .............................................................................. 26 4.8 Methodology used to Estimate Crossing Structures providing an additional three lanes in each direction ............................................................................................................................................... 27 5 Option A ......................................................................................................................................................... 28 5.1 Introduction.......................................................................................................................................... 28 5.2 Existing Crossing Layout and Associated Junctions .......................................................................... 28 5.3 Assumed Illustrative Route ................................................................................................................. 29 5.4 Review of Environmental Constraints ................................................................................................. 29 5.5 Review of Planning Constraints (see Figure 8a and Appendix 4) ...................................................... 31 5.6 Review of Engineering Design Constraints ......................................................................................... 32 5.7 Assumed Road and Crossing Structures ............................................................................................ 33 5.8 Buildability ........................................................................................................................................... 38 5.9 Deliverability ........................................................................................................................................ 39 5.10 Estimated Costs .................................................................................................................................. 39 6 Option B ......................................................................................................................................................... 42 6.1 Introduction.......................................................................................................................................... 42 6.2 Assumed Illustrative Route ................................................................................................................. 42 6.3 Review of Environmental Constraints ................................................................................................. 43 6.4 Review of Planning Constraints (see Figure 8a)................................................................................. 44 6.5 Review of Engineering Design Constraints ......................................................................................... 46 6.6 Assumed Road and Crossing Structures ............................................................................................ 47 6.7 Buildability ........................................................................................................................................... 50 6.8 Deliverability ........................................................................................................................................ 52 6.9 Estimated Costs .................................................................................................................................. 52 7 Option C ......................................................................................................................................................... 55 7.1
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