Access to Argyll and Bute (A83) Strategic Environmental Assessment & Preliminary Engineering Services DMRB Stage 1 Assessment Report
Total Page:16
File Type:pdf, Size:1020Kb
Access to Argyll and Bute (A83) Strategic Environmental Assessment & Preliminary Engineering Services DMRB Stage 1 Assessment Report A83AAB-JAC-GEN-XX_XX-RP-CH-0003 | C02 29/04/21 Transport Scotland TS/MTRIPS/SER/2018/11 Stra tegic Envi ronmen tal Assessment & P relimina ry En gine ering Se rvices - DMRB S tage 1 Assessment Re po rt Trans por t Sc otla nd Access to Argyll and Bute (A83) Strategic Environmental Assessment & Preliminary Engineering Services DMRB Stage 1 Assessment Report Chapter 1 – Introduction Access to Argyll and Bute (A83) Project No: A83AAB Document Title: Strategic Environmental Assessment & Preliminary Engineering Services - DMRB Stage 1 Assessment Report Document No.: A83AAB-JAC-GEN-XX_XX-RP-CH-0003 Revision: C02 Document Status: A1 – Accepted – Brief Date: 29/04/21 Client Name: Transport Scotland Client No: TS/MTRIPS/SER/2018/11 Project Manager: D. ROBERTSON Author: R. CLIFT File Name: A83AAB-JAC-GEN-XX_XX-RP-CH-0003.docx Jacobs U.K. Ltd 95 Bothwell Street Glasgow, Scotland G2 7HX United Kingdom T +44 (0)141 243 8000 F +44 (0)141 226 3109 www.jacobs.com © Crown copyright 2021. You may re-use this information (excluding logos) free of charge in any format or medium, under the terms of the Open Government Licence. To view this licence, visit http://www.nationalarchives.gov.uk/doc/open-government-licence/ or e-mail: [email protected]. Where we have identified any third party copyright information you will need to obtain permission from the copyright holders concerned. Limitation: This report has been prepared on behalf of, and for the exclusive use of Jacobs’ Client, and is subject to, and issued in accordance with, the provisions of the contract between Jacobs and the Client. Jacobs accepts no liability or responsibility whatsoever for, or in respect of, any use of, or reliance upon, this report by any third party. Document history and status Revision Date Description Author Checked Reviewed Approved C02 29/04/21 Issued For Publication RC SB DR DR A83AAB-JAC-GEN-XX_XX-RP-CH-0003 i Access to Argyll and Bute (A83) Strategic Environmental Assessment & Preliminary Engineering Services DMRB Stage 1 Assessment Report Chapter 1 – Introduction Contents Glossary…………………………………………………………………………………………………….…iv Abbreviations………………………………………………………………………………………………....x 1. Introduction ....................................................................................................................................1 of Chapter 1 1.1 Background .....................................................................................................................................................1 of Chapter 1 1.2 Need for the Scheme ...................................................................................................................................1 of Chapter 1 1.3 Scheme Objectives .......................................................................................................................................2 of Chapter 1 1.4 Consultations ..................................................................................................................................................2 of Chapter 1 1.5 Scheme Appraisal .........................................................................................................................................3 of Chapter 1 1.6 Scheme Development History .................................................................................................................4 of Chapter 1 1.7 Method of Assessment ...............................................................................................................................4 of Chapter 1 1.8 Report Structure ............................................................................................................................................4 of Chapter 1 2. Existing Conditions .......................................................................................................................1 of Chapter 2 2.1 Introduction ....................................................................................................................................................1 of Chapter 2 3. Description of Alternative Schemes ..........................................................................................1 of Chapter 3 3.1 General ..............................................................................................................................................................1 of Chapter 3 3.2 Preliminary Assessment .............................................................................................................................1 of Chapter 3 3.3 Description of the Preferred Route Corridor ......................................................................................2 of Chapter 3 3.4 Description of Possible Route Options within the Preferred Corridor .....................................3 of Chapter 3 3.5 On-going Mitigation Works in Glen Croe ............................................................................................8 of Chapter 3 3.6 Preliminary Cost Estimates .......................................................................................................................8 of Chapter 3 4. Engineering Assessment ..............................................................................................................1 of Chapter 4 4.1 Introduction ....................................................................................................................................................1 of Chapter 4 4.2 Alignment and Cross-section ..................................................................................................................1 of Chapter 4 4.3 Junctions, Accesses and Lay-bys ............................................................................................................7 of Chapter 4 4.4 Geotechnics and Earthworks ....................................................................................................................9 of Chapter 4 4.5 Hydrology, Hydrogeology and Drainage .......................................................................................... 14 of Chapter 4 4.6 Structures ..................................................................................................................................................... 17 of Chapter 4 4.7 Pavements .................................................................................................................................................... 25 of Chapter 4 4.8 Vehicle Restraint Systems ..................................................................................................................... 26 of Chapter 4 4.9 Public Utilities.............................................................................................................................................. 26 of Chapter 4 4.10 Non-Motorised Users (NMUs) .............................................................................................................. 27 of Chapter 4 4.11 Constructability Considerations ........................................................................................................... 29 of Chapter 4 A83AAB-JAC-GEN-XX_XX-RP-CH-0003 ii Access to Argyll and Bute (A83) Strategic Environmental Assessment & Preliminary Engineering Services DMRB Stage 1 Assessment Report Chapter 1 – Introduction 5. Environmental Assessment .........................................................................................................1 of Chapter 5 5.1 Introduction ....................................................................................................................................................1 of Chapter 5 5.2 General Principles and Environmental Approach ............................................................................2 of Chapter 5 5.3 Findings ............................................................................................................................................................4 of Chapter 5 6. Traffic and Economic Assessment .............................................................................................1 of Chapter 6 6.1 Introduction ....................................................................................................................................................1 of Chapter 6 6.2 Future Traffic Growth ..................................................................................................................................1 of Chapter 6 6.3 Effects of Improvement Strategies ........................................................................................................2 of Chapter 6 6.4 Economics ........................................................................................................................................................3 of Chapter 6 6.5 Wider Economic Impacts............................................................................................................................5 of Chapter 6 7. Risk ....................................................................................................................................................1 of Chapter 7 7.1 Introduction ....................................................................................................................................................1 of Chapter 7 7.2 Challenges and Risks ...................................................................................................................................1