M5 Junction 10 Improvements Scheme
Total Page:16
File Type:pdf, Size:1020Kb
M5 Junction 10 Improvements Scheme Technical Appraisal Report Volume 1 - Report M5 Junction 10 Improvement Scheme Volume 1 - Report - Technical Appraisal Report Notice This document and its contents have been prepared and are intended solely for the Client’s information and use in relation to M5 Junction 10 Improvement Atkins Limited assumes no responsibility to any other party in respect of or arising out of or in connection with this document and/or its contents. Document history Purpose Revision Status Originated Checked Reviewed Authorised Date description C03 A1 Final Issue CJ CCR TT TT 15/09/20 C02 A1 Final Issue CJ CCR TT TT 10/08/20 C01 A1 Second issue CG CCR HC HC 18/06/20 First Draft for P01 S3 GCC Internal SW MT CCR --- 03/12/19 Review Client signoff Client Gloucestershire County Council Project M5 Junction 10 Improvement Job number 5188483 Client signature / date Security Classification - High Page 2 of 186 GCCM5J10-ATK-GEN-XX-RP-ZM-000001 | C03 | M5 Junction 10 Improvement Scheme Volume 1 - Report - Technical Appraisal Report Contents Chapter Page Executive Summary 8 1. Introduction 12 1.1. Scheme Background 12 1.2. Location of the scheme 12 1.3. Purpose of this Report 14 2. Planning Brief 15 2.1. Introduction 15 2.2. Scheme Objectives 15 3. Existing Conditions 17 3.1. Description of the Locality 17 3.2. Existing Highway Network 17 3.3. Current Issues at M5 Junction 10 18 3.4. Existing Structures 19 3.5. Existing Road Pavement 31 3.6. Existing Traffic Conditions 37 3.7. Topography, Land Use, Property and Industry 51 3.8. Climate 52 3.9. Flood Risk 52 3.10. Existing Road Drainage 56 3.11. Geology 59 3.12. Geohazards 61 3.13. Groundwater 61 3.14. Contaminated Land 61 3.15. Agricultural Soils 63 3.16. Public Utilities 64 3.17. Operational Maintenance Regime 65 3.18. Existing Road Lighting 66 3.19. Existing Technology Provision 66 3.20. Existing Earthworks 68 4. Environmental Status 71 4.2. Designations 71 5. Existing Environmental Conditions 72 5.2. Noise 72 5.3. Local Air Quality 72 5.4. Greenhouse Gases 73 5.5. Landscape 74 5.6. Heritage and Historic Resources 74 5.7. Biodiversity 75 5.8. Water Environment 77 5.9. People and Communities 77 6. Accessibility 79 6.1. Option Values 79 6.2. Existing footpaths and public rights of way 80 6.3. Transport Interchange 80 Security Classification - High Page 3 of 186 GCCM5J10-ATK-GEN-XX-RP-ZM-000001 | C03 | M5 Junction 10 Improvement Scheme Volume 1 - Report - Technical Appraisal Report 7. Maintenance and Repair Statement 81 7.1. Introduction 81 7.2. Maintenance requirements 81 8. Planning Factors 83 8.1. Introduction 83 8.2. Housing 83 8.3. Employment Areas 83 8.4. Transport and Connectivity 84 8.5. Environmental 84 8.6. Programming 84 8.7. Statutory Process 85 9. Options Identified for Appraisal 86 9.1. Scheme History 86 9.2. Previous M5 Junction 10 Studies 86 9.3. West Cheltenham Link Road Options 86 9.4. Homes England Business Case Concept Options 86 9.5. Options Identified at Options identification Stage 86 9.6. Sifting of Options at Options identification Stage 87 9.7. Description of Options carried forward for Appraisal 87 9.8. Road Layout and Standards 90 10. Traffic Analysis 96 10.1. Traffic Data Collection 96 10.2. Model Development 97 10.3. Model Forecasting 98 10.4. Model Results 100 10.5. Conclusion 110 11. Economic Assessment 111 11.1. Introduction 111 11.2. Options Assessed 111 11.3. Application of Assessment Software 112 11.4. Economic Impact 112 11.5. Overall Results 114 11.6. Comparison of options and summary 117 12. Safety Assessment 118 12.1. Impact on Road User – Strategic Safety Action Plan 118 12.2. Construction (Design and Management) Regulations 2015 119 13. Operational Assessment 121 13.2. Scheme’s Operating Regime 121 13.3. Driver Compliance 122 14. Structures Assessment 123 14.1. Basis of Structures Assessment 123 14.2. Highway Cross Sections and Long Sections 123 14.3. Modification of Existing Structures 123 14.4. New and Replacement Structures 124 14.5. Scheme Options Structure Requirements 126 14.6. Option 1A Structure Requirements 126 14.7. Option 2 Structure Requirements 129 14.8. Option 2A Structure Requirements 130 14.9. Option 2B Structure Requirements 132 14.10. Option 5 Structure Requirements 134 Security Classification - High Page 4 of 186 GCCM5J10-ATK-GEN-XX-RP-ZM-000001 | C03 | M5 Junction 10 Improvement Scheme Volume 1 - Report - Technical Appraisal Report 14.11. Summary of Structures Assessment 136 15. Road Pavement Assessment 138 15.1. The impact of the options identified for appraisal 138 16. Technology Assessment 140 16.1. General 140 16.2. Common Impact 140 16.3. Option 1A Specific Analysis 141 16.4. Option 2 Specific Analysis 141 16.5. Option 2A Specific Analysis 142 16.6. Option 2B Specific Analysis 142 16.7. Option 5 Specific Analysis 142 16.8. Further considerations 143 17. Public Utilities Assessment 144 17.2. Option 1A – New M5 Junction and A4019 Link Road 144 17.3. Options 2, 2A and 2B Upgrade of Existing M5 Junction 10 144 17.4. Option 5 – New M5 Junction and A4019 Link Road 145 17.5. A4019 Carriageway Improvements 145 17.6. B4634 Old Gloucester Road and New Link Road to A4019 Tewkesbury Road 146 18. Drainage Assessment 147 18.1. Proposed drainage strategy 147 19. Lighting Assessment 151 19.1. Options 1A and 5 151 19.2. Options 2, 2A and 2B 151 20. Maintenance Assessment 153 20.2. Maintenance and Repair of Civil Infrastructure 153 21. Environmental Assessment 154 21.2. Noise and Vibration 154 21.3. Air Quality 155 21.4. Greenhouse gases 156 21.5. Landscape and Visual Amenity 158 21.6. Heritage and historic resources 159 21.7. Biodiversity 160 21.8. Geology and Soils 162 21.9. Water Environment 165 21.10. Materials and Waste Impacts 166 21.11. Population and Human Health 170 21.12. Social Assessments 171 22. Assessment Summary 176 22.1. Appraisal Summary Tables (ASTs) 176 23. Programme 177 23.1. Scheme Level Programme 177 24. Detailed Cost Estimate 178 24.1. Option Cost Comparison 178 25. Conclusion and Recommendations 179 25.1. Options for Public Consultation 179 25.2. Brief summary description of each option 179 25.3. Environmental Impact 180 25.4. Buildability and Programme 181 25.5. Compatibility with Scheme Objectives 181 Security Classification - High Page 5 of 186 GCCM5J10-ATK-GEN-XX-RP-ZM-000001 | C03 | M5 Junction 10 Improvement Scheme Volume 1 - Report - Technical Appraisal Report 25.6. Option Cost 181 25.7. BCF and VfM 182 25.8. Options to be taken forward 182 26. Glossary 183 Appendices – Refer to Volume 2 185 Tables Table 2.1 – M5 Junction 10 Improvement Scheme Objectives ....................................................... 15 Table 3.1 – HAPMS Construction Data Summary .......................................................................... 32 Table 3.2 – Summary of HAPMS data coverage (%) ..................................................................... 33 Table 3.3 – M5 Mainline Traffic Counts – M5 J9 – J10 (veh) .......................................................... 38 Table 3.4 – M5 Mainline Traffic Counts - M5 J10 – J11 (veh)......................................................... 38 Table 3.5 – A4019 West Count Sites - 2013 (veh) ......................................................................... 39 Table 3.6 - Maximum Observed Queue Length (vehs) .................................................................. 39 Table 3.7 – SRN Collision Rate ..................................................................................................... 41 Table 3.8 – Comparison of KSIs on SRN ....................................................................................... 41 Table 3.9 – A4019 Common Contributory Factors ......................................................................... 42 Table 3.10 – Average and Median Journey Times ......................................................................... 46 Table 3.11 – Key Journey Time Routes ......................................................................................... 51 Table 3.12 – Existing Outfalls Identified ......................................................................................... 57 Table 3.13 – Potential Sources of Contamination north of M5 Junction 10 ..................................... 61 Table 3.14 – Potential Sources of Contamination at or surrounding the existing M5 Junction 10 .... 62 Table 3.15 – List of Statutory Undertakers Consultees .................................................................. 64 Table 3.16 – Summary of Earthworks at M5 J10 ........................................................................... 70 Table 5.1 – UK Carbon Reduction Targets .................................................................................... 73 Table 5.2 – Protected and Notable Species confirmed or Potentially present within Study Area. .... 76 Table 6.1 – Existing Bus Services ................................................................................................. 79 Table 6.2 – Existing Bus Stops ...................................................................................................... 79 Table 9.1 – Proposed merge/diverge layout and spacing for Option 1A ......................................... 91 Table 10.1 – Scenario P Demand - Year on Year Growth .............................................................. 99 Table 10.2 - Scenario Q Demand - Year on Year Growth .............................................................. 99 Table 10.3 – Assignment Statistics – 2021 .................................................................................