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View Preliminary Assessment Report Main Report Access to Argyll and Bute (A83) Strategic Environmental Assessment & Preliminary Engineering Services Preliminary Assessment Report A83AAB-JAC-GEN-XX_XX-RP-CH-0002 | C01 18/03/21 Transport Scotland TS/MTRIPS/SER/2018/11 Stra tegic Envi ronmen tal Assessment & P relim ina ry En gine erin g Se rvices - Prelim inary Assessment Rep or t Trans por t Sc otla nd Access to Argyll and Bute (A83) Strategic Environmental Assessment & Preliminary Engineering Services Preliminary Assessment Report Access to Argyll and Bute (A83) Project No: A83AAB Document Title: Strategic Environmental Assessment & Preliminary Engineering Services - Preliminary Assessment Report Document No.: A83AAB-JAC-GEN-XX_XX-RP-CH-0002 Revision: C01 Document Status: A1 – Accepted - Brief Date: 18/03/21 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-0002.docx Jacobs U.K. Limited 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 C01 18/03/21 Issued to Transport Scotland for Publication R.C. S.B. D.R. D.R. A83AAB-JAC-GEN-XX_XX-RP-CH-0002 i Access to Argyll and Bute (A83) Strategic Environmental Assessment & Preliminary Engineering Services Preliminary Assessment Report Contents 1. Introduction ............................................................................................................................................................ 1 1.1 Overview ..................................................................................................................................................................................... 1 1.2 Background ............................................................................................................................................................................... 2 2. Access to Argyll and Bute (A83) Objectives .................................................................................................... 3 2.1 Overview ..................................................................................................................................................................................... 3 2.2 Identification of Problems and Opportunities ............................................................................................................. 3 2.3 Scheme Specific Transport Planning Objectives ........................................................................................................ 4 2.4 Mapping to STPR2 National and Regional Objectives ............................................................................................. 5 3. Design Basis and Assessment Methodology ................................................................................................... 9 3.1 Design Basis .............................................................................................................................................................................. 9 3.2 Assessment Methodology ................................................................................................................................................... 9 3.3 Preliminary Assessment Workshop .............................................................................................................................. 12 4. Route Corridors Considered ............................................................................................................................. 13 4.1 Description of Route Corridors Included / Rationale for their Inclusion........................................................ 13 5. Public Consultation ............................................................................................................................................ 24 5.1 Background ............................................................................................................................................................................ 24 5.2 Public consultation route corridor variations ........................................................................................................... 24 6. Scheme Specific Transport Planning Objectives Assessment ................................................................. 27 6.1 Summary ................................................................................................................................................................................. 27 7. STAG Criteria Assessment ................................................................................................................................ 30 7.1 Summary ................................................................................................................................................................................. 30 8. Implementability Criteria Assessment .......................................................................................................... 32 8.1 Summary ................................................................................................................................................................................. 32 9. Findings of Assessment ..................................................................................................................................... 36 9.1 Roadworks .............................................................................................................................................................................. 36 9.2 Structures ................................................................................................................................................................................ 36 9.3 Tunnels .................................................................................................................................................................................... 36 9.4 Constructability..................................................................................................................................................................... 36 9.5 Geotechnical .......................................................................................................................................................................... 36 9.6 Environment .......................................................................................................................................................................... 36 9.7 Economics ............................................................................................................................................................................... 38 9.8 Risks and Opportunities .................................................................................................................................................... 38 10. Preliminary Assessment Results and Recommendation ........................................................................... 40 Appendix A. Preliminary Assessment Workshop Report Appendix B. Problems and Opportunities Appendix C. Route Corridor Drawings Appendix D. Assessment Summary Tables A83AAB-JAC-GEN-XX_XX-RP-CH-0002 ii Access to Argyll and Bute (A83) Strategic Environmental Assessment & Preliminary Engineering Services Preliminary Assessment Report Appendix E. Implementability Scoring Criteria Appendix F. Tunnels Technical Note Appendix G. Structures Appraisal Technical Note Appendix H. Consultation Design & Mitigation Suggestions A83AAB-JAC-GEN-XX_XX-RP-CH-0002 iii Access to Argyll and Bute (A83) Strategic Environmental Assessment & Preliminary Engineering Services Preliminary Assessment Report 1. Introduction 1.1 Overview 1.1.1 Following recent landslide events in August 2020, Jacobs Aecom were commissioned by Transport Scotland to undertake a Strategic Environmental Assessment (SEA) and provide Preliminary Engineering Services (PES) as part of a Design Manual for Roads and Bridges (DMRB) Stage 1 Assessment to identify a preferred route corridor for access to Argyll and Bute. 1.1.2 The SEA and PES assessment is being carried out in two stages: § Preliminary assessment (this report) – an initial assessment considering 11 route corridor options with the objective of identifying if route corridors can be removed from further consideration at this stage to allow more detailed consideration of those route corridors remaining to allow a recommendation on the preferred route corridor. The 11 route corridors are shown below in Figure 1.1. § Detailed assessment – an assessment in line with the DMRB of the route corridors taken forward from the preliminary assessment. The detailed assessment
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