A422 FARTHINGHOE BYPASS Scheme Assessment Report
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Northamptonshire County Council A422 FARTHINGHOE BYPASS Scheme Assessment Report 70064784-WSP-XX-XX-RP-HE-00001 AUGUST 2020 PUBLIC Northamptonshire County Council A422 FARTHINGHOE BYPASS Scheme Assessment Report TYPE OF DOCUMENT (VERSION) PUBLIC PROJECT NO. 70064784 OUR REF. NO. 70064784-WSP-XX-XX-RP-HE-00001 DATE: AUGUST 2020 WSP 1 Capital Quarter Tyndall Street Cardiff CF10 4BZ WSP.com QUALITY CONTROL Issue/revision 1st Draft 2nd Draft 1st Issue (v0) 2nd Issue (v1) 3rd Issue (v2) Remarks SAR Draft 1 SAR Draft 2 SAR Draft 3 SAR Draft 4 SAR FINAL Date 10/09/20 18/09/20 25/09/20 14/10/20 27/10/20 Prepared by Edward Tonks, Edward Tonks, Edward Tonks, Ed Tonks Ed Tonks Rebekah Rebekah Rebekah Rebekah Rebekah Thompson, Thompson, Thompson, Gideon Thompson Thompson Gideon Jones, Gideon Jones, Jones, Steven Steven Spence, Steven Spence, Mark Hill Mark Hill Spence, Mark Hill Signature Checked by Mike Steward, Mike Steward, Mike Steward, Mike Steward Mike Steward Gavin Lewis Gavin Lewis Marc Thomas Marc Thomas Marc Thomas Signature WSP Mike Steward Mike Steward Mike Steward Mike Steward Mike Steward Authorised by Signature KierWSP Authorised Angela Wong Angela Wong Angela Wong Mike Newport Mike Newport by Signature Project 70064784 70064784 70064784 70064784 70064784 number 70064784-WSP- 70064784- 70064784-WSP- 70064784- 70064784- Report number XX-XX-RP-HE- WSP-XX-XX- XX-XX-RP-HE- WSP-XX-XX- WSP-XX-XX- 00001 RP-HE-00001 00001 RP-HE-00001 RP-HE-00001 70064784-WSP- 70064784- 70064784-WSP- 70064784- 70064784- XX-XX-RP-HE- WSP-XX-XX- XX-XX-RP-HE- WSP-XX-XX- WSP-XX-XX- File reference 00001.docx RP-HE- 00001 v0.docx RP-HE-00001 RP-HE-00001 00001.docx v1.docx v2.docx contents A422 FARTHINGHOE BYPASS WSP Project No.: 70064784 AUGUST 2020 Northamptonshire County Council CONTENTS QUALITY CONTROL CONTENTS CONTENTS EXECUTIVE SUMMARY 1 1. INTRODUCTION 3 PURPOSE OF REPORT 3 REPORT STRUCTURE 3 BACKGROUND 3 FURTHER DEVELOPMENT OF THE ROUTE 4 COVID19 6 2. EXISTING CONDITIONS 7 DESCRIPTION OF LOCALITY 7 TOPOGRAPHY 7 LAND USE 7 AGRICULTURE 7 RESIDENTIAL 7 COMMERCIAL 7 LEISURE 8 HIGHWAY NETWORK 8 NON MOTORISED USER (NMU) PROVISION AND ACCESS 8 PUBLIC AND COMMUNITY TRANSPORT 8 TRAFFIC FLOWS 9 TRAFFIC ACCIDENTS 9 STATUTORY UNDERTAKERS 10 3. DEVELOPMENT OF CORRIDOR OPTIONS 11 A422 FARTHINGHOE BYPASS WSP Project No.: 70064784 AUGUST 2020 Northamptonshire County Council PREVIOUS OPTIONS 11 CORRIDOR REVIEW 11 4. ENGINEERING ASSESSMENT 12 DESIGN OPTIONS 12 HIGHWAY STANDARD 12 RECOMMENDATION 14 DESIGN SPEED 14 RECOMMENDATION 15 ALIGNMENT 15 RECOMMENDATION 16 JUNCTION STRATEGY 16 RECOMMENDATION 17 OVERTAKING PROVISION 17 RECOMMENDATION 18 LAY-BY 18 PARKING LAY-BY 18 RECOMMENDATION 19 MAINTENANCE LAY-BY AND HARDSTANDINGS 19 EARTHWORKS AND GROUND CONDITIONS 19 HIGHWAY DRAINAGE 19 SURFACE RUNOFF 19 SUB-SURFACE DRAINAGE 20 ATTENUATION PONDS 20 RECOMMENDATION 21 FENCING 21 ROAD RESTRAINTS SYSTEMS 22 PAVEMENT 22 RECOMMENDATION 23 TRAFFIC SIGNS AND ROAD MARKINGS 24 ROAD LIGHTING 24 COST ESTIMATE 24 A422 FARTHINGHOE BYPASS WSP Project No.: 70064784 AUGUST 2020 Northamptonshire County Council 5. GEOTECHNICAL ASSESSMENT 27 INTRODUCTION 27 GROUND CONDITIONS 27 SUPERFICIAL DEPOSITS 27 SOLID GEOLOGY 28 BGS INFORMATION 30 SURFACE WATER 31 LANDFILLS AND WASTE SITES 31 PRELIMINARY GEOTECHNICAL ASSESSMENT AND RISKS 31 STRUCTURES 31 GROUND AGGRESSIVITY 32 CUTTINGS 32 EMBANKMENTS 33 REUSE OF MATERIALS 33 PRELIMINARY ALIGNMENT ASSESSMENT 33 GROUND INVESTIGATION SCOPE 34 6. APPRAISAL OF NEW STRUCTURES 35 INTRODUCTION 35 ROUTE CORRIDOR OPTIONS 36 STRUCTURES DESIGN PHILOSOPHY 37 COST ESTIMATES 39 7. ENVIRONMENTAL ASSESSMENT 41 ENVIRONMENTAL METHODOLOGY 41 AIR QUALITY 41 CULTURAL HERITAGE 44 LANDSCAPE AND VISUAL IMPACT 53 BIODIVERSITY 57 GEOLOGY AND SOILS 58 MATERIAL ASSETS AND WASTE 63 A422 FARTHINGHOE BYPASS WSP Project No.: 70064784 AUGUST 2020 Northamptonshire County Council NOISE AND VIBRATION 69 POPULATION AND HUMAN HEALTH 74 ROAD DRAINAGE AND THE WATER ENVIRONMENT 78 CLIMATE 85 ENVIRONMENTAL BASELINE 92 AIR QUALITY 92 CULTURAL HERITAGE 95 LANDSCAPE AND VISUAL IMPACT 118 BIODIVERSITY 120 GEOLOGY AND SOILS 124 MATERIALS ASSETS AND WASTE 132 NOISE AND VIBRATION 138 POPULATION AND HUMAN HEALTH 143 ROAD DRAINAGE AND THE WATER ENVIRONMENT 147 CLIMATE 152 7.3 ENVIRONMENTAL IMPACTS 165 AIR QUALITY 165 CULTURAL HERITAGE 168 LANDSCAPE AND VISUAL IMPACT 182 BIODIVERSITY 200 GEOLOGY AND SOILS 202 MATERIALS AND WASTE 213 NOISE AND VIBRATION 220 PEOPLE AND COMMUNITIES 229 ROAD DRAINAGE AND WATER ENVIRONMENT 234 CLIMATE 245 CONSTRUCTION PHASE (2024-2026) 248 OPERATIONAL PHASE (2026-2085) 248 TOTAL FOR LIFECYCLE (2024-2085) 249 COMPARISON OF THE PROPOSED SCHEME GHG EMISSIONS AGAINST UK NATIONAL CARBON BUDGET 249 A422 FARTHINGHOE BYPASS WSP Project No.: 70064784 AUGUST 2020 Northamptonshire County Council TOTAL (TCO2E) DURING FOURTH CARBON BUDGET PERIOD (2023-2027) (% OF BUDGET) 249 TOTAL (TCO2E) DURING FIFTH CARBON BUDGET PERIOD (2028-2032) (% OF BUDGET) 249 (-0.00003%) 249 (-0.00003%) 249 (-0.00003%) 249 (-0.00003%) 249 (-0.00003%) 249 RESIDUAL EFFECTS REQUIRING FURTHER ASSESSMENT 256 7.4 ENVIRONMENTAL MITIGATION 258 AIR QUALITY 258 CULTURAL HERITAGE 260 LANDSCAPE AND VISUAL IMPACT 262 BIODIVERSITY 263 GEOLOGY AND SOILS 264 MATERIAL ASSETS AND WASTE 265 ELEMENT 266 DESCRIPTION 266 MECHANISM/ TIMING 266 RESPONSIBILITY 266 MATERIAL RESOURCE CONSUMPTION 266 IDENTIFICATION AND SPECIFICATION OF MATERIAL RESOURCES THAT CAN BE ACQUIRED RESPONSIBLY, IN ACCORDANCE WITH BES 6001 RESPONSIBLE SOURCING OF CONSTRUCTION PRODUCTS. 266 DETAILED DESIGN AND CONSTRUCTION 266 DETAILED DESIGNER AND CONTRACTOR 266 DESIGN FOR RESOURCE OPTIMISATION: SIMPLIFYING LAYOUT AND FORM, USING STANDARD SIZES, BALANCING CUT AND FILL, MAXIMISING THE USE OF RENEWABLE MATERIALS WITH RECYCLED OR SECONDARY CONTENT, AND SETTING NET IMPORTATION AS A SCHEME GOAL. 266 DETAILED DESIGN 266 DETAILED DESIGNER 266 A422 FARTHINGHOE BYPASS WSP Project No.: 70064784 AUGUST 2020 Northamptonshire County Council DESIGN FOR OFF-SITE CONSTRUCTION: MAXIMISING THE USE OF PRE-FABRICATED STRUCTURES AND COMPONENTS, ENCOURAGING A PROCESS OF ASSEMBLY RATHER THAN CONSTRUCTION. 266 DETAILED DESIGN 266 DETAILED DESIGNER 266 DESIGN FOR THE FUTURE: CONSIDERING HOW MATERIALS CAN BE DESIGNED TO BE MORE EASILY ADAPTED OVER AN ASSET LIFETIME, AND HOW DE- CONSTRUCTABILITY AND DE-MOUNTABILITY OF ELEMENTS CAN BE MAXIMISED AT END-OF-FIRST-LIFE. 266 DETAILED DESIGN 266 DETAILED DESIGNER 266 IDENTIFY OPPORTUNITIES TO MINIMISE THE EXPORT AND IMPORT OF MATERIAL RESOURCES. 266 DETAILED DESIGN AND CONSTRUCTION 266 DETAILED DESIGNER AND LEAD CONTRACTOR 266 AS PART OF A CONSTRUCTION ENVIRONMENTAL MANAGEMENT PLAN (CEMP), IMPLEMENT A MATERIALS MANAGEMENT PLAN (MMP) IN ACCORDANCE WITH THE CL:AIRE DEFINITION OF WASTE: CODE OF PRACTICE. 267 CONSTRUCTION 267 ENVIRONMENTAL CONSULTANT AND LEAD CONTRACTOR 267 GENERATION AND DISPOSAL OF WASTE TO LANDFILL 267 ENGAGE EARLY WITH CONTRACTORS TO IDENTIFY POSSIBLE ENHANCEMENT AND MITIGATION MEASURES (FOR EXAMPLE, WASTE EXEMPTION LICENSES), AND TO IDENTIFY OPPORTUNITIES TO REDUCE WASTE THROUGH COLLABORATION AND REGIONAL SYNERGIES. 267 DETAILED DESIGN AND PROCUREMENT 267 DETAILED DESIGNER AND LEAD CONTRACTOR 267 DESIGN FOR RECOVERY AND REUSE: IDENTIFYING, SECURING AND USING MATERIAL RESOURCES AT THEIR HIGHEST VALUE, WHETHER THEY ALREADY EXIST ON SITE, OR ARE SOURCED FROM OTHER SCHEMES. 267 DETAILED DESIGN 267 DETAILED DESIGNER 267 ENSURE ARISINGS AND WASTE ARE PROPERLY CHARACTERISED BEFORE OR DURING DESIGN, TO MAXIMISE THE POTENTIAL FOR HIGHEST VALUE REUSE. 267 DETAILED DESIGN 267 A422 FARTHINGHOE BYPASS WSP Project No.: 70064784 AUGUST 2020 Northamptonshire County Council DETAILED DESIGNER 267 IDENTIFY AREAS FOR STOCKPILING AND STORING WASTES THAT WILL MINIMISE QUALITY DEGRADATION AND LEACHATE AND WILL MINIMISE DAMAGE AND LOSS. 267 DETAILED DESIGN AND CONSTRUCTION 267 DETAILED DESIGNER AND LEAD CONTRACTOR 267 WORKING TO A PROXIMITY PRINCIPLE, ENSURING ARISINGS GENERATED ARE HANDLED, STORED, MANAGED AND RE-USED OR RECYCLED AS CLOSE AS POSSIBLE TO THE POINT OF ORIGIN. 267 DETAILED DESIGN AND CONSTRUCTION 267 DETAILED DESIGNER AND LEAD CONTRACTOR 267 AS PART OF A CONSTRUCTION ENVIRONMENTAL MANAGEMENT PLAN (CEMP), SPECIFY MANAGEMENT REQUIREMENTS FOR WASTE AND ARISINGS AND CAPTURE INFORMATION AND DATA ON SITE ARISINGS RECOVERED AND DIVERTED FROM LANDFILL AND WASTE SENT TO LANDFILL, BY DEVELOPING A DESIGN SITE WASTE MANAGEMENT PLAN ONCE A PREFERRED OPTION HAS BEEN SELECTED. 267 CONSTRUCTION 267 ENVIRONMENTAL CONSULTANT 267 NOISE AND VIBRATION 268 POPULATION AND HUMAN HEALTH 269 ROAD DRAINAGE AND THE WATER ENVIRONMENT 271 CLIMATE 271 8. TRAFFIC 274 TRAFFIC ASSESSMENT 274 THE EFFECTS OF COVID-19 274 9. SUMMARY OF ASSESSMENTS AND INITIAL RECOMMENDATIONS 275 ENGINEERING ASSESSMENT 275 9.2 ENVIRONMENTAL ASSESSMENT 277 9.3 TRAFFIC/TRANSPORT ASSESSMENT 280 THE EFFECTS OF COVID-19, ALTERNATIVE PROPOSAL AND DEVELOPMENT OF THE STRATEGIC OUTLINE BUSINESS CASE 280 PROPOSED APPROACH 280 A422 FARTHINGHOE BYPASS WSP Project No.: 70064784 AUGUST 2020 Northamptonshire County Council 9.4 RECOMMENDATION FOR A PREFERRED ROUTE CORRIDOR 281 10. PROGRAMME FOR DELIVERY 283 PHASE 1 - PUBLIC CONSULTATION AND PREPARATION OF THE SOBC 283 PHASE 2 - DEVELOPMENT OF THE PRELIMINARY DESIGN 283 PHASE 3 DETAILED DESIGN 283 PHASE 4 – PROCUREMENT 283 PHASE 5 CONSTRUCTION 284 FULL PROGRAMME 284 APPENDICES APPENDIX A - DESIGN OPTIONS DRAWINGS APPENDIX B - COST ESTIMATE APPENDIX C - STRUCTURES SCHEDULE APPENDIX D - NORTHERN ROUTE STRUCTURES DRAWINGS APPENDIX E - SOUTHERN ROUTE STRUCTURES