N4 Collooney to Castlebaldwin, Proposed Road Development
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N4 Collooney to Castlebaldwin Proposed Road Development Addendum to the Route Selection Report NNN444 CCCooolllllloooooonnneeeyyy tttooo CCCaaassstttllleeebbbaaallldddwwwiiinnn,,, PPPrrroopppooossseeeddd RRRoooaaaddd DDDeeevvveeelllooopppmmmeeennnttt AAADDDDDDEEENNNDDDUUUMMM TTTOOO RRROOOUUUTTTEEE SSSEEELLLEEECCCTTTIIIOOONNN RRREEEPPPOOORRRTT PPPRRREEEPPPAAARRREEEDDD BBBYYY::: NNNaaatttiiiooonnnaaalll RRRoooaaaddd DDDeeesssiiigggnnn DDDeeepppaaarrrtttmmmeeennnttt,,, SSSllliiigggooo CCCooouuunnntttyyy CCCooouuunnnccciiilll;;; National Road Design Department, Sligo County Council Page 1 N4 Collooney to Castlebaldwin Proposed Road Development Addendum to the Route Selection Report Document Control Status Issue No. Issued For Developed Date Approved DRAFT 1 Design/EIS Team Review BS (CEng) December 2012 AS (CEng) FM(CEng)/BS DRAFT 1 Design/EIS Team Review August 2013 AS (CEng) (CEng) FM(CEng)/BS FINAL 3 FINAL September 2013 AS (CEng) (CEng) National Road Design Department, Sligo County Council Page 2 N4 Collooney to Castlebaldwin Proposed Road Development Addendum to the Route Selection Report TABLE OF CONTENTS 1 INTRODUCTION AND CONTEXT 13 1.1 Location 13 1.2 Purpose of This Report 14 2 CONSTRAINTS STUDY AREA 15 2.1 Adoption of Constraints Study Area 15 3 IDENTIFICATION OF NEED 17 3.1 The NRA, National Road Needs Study 17 3.2 Existing Network 17 3.3 Traffic 18 3.4 Economy 18 3.5 Safety 18 3.6 Environment 19 3.7 Accessibility and Social Inclusion 20 3.8 Integration 20 3.9 Additional Benefits of the Proposed Road Development 20 4 TRAFFIC ASSESSMENT & ROUTE CROSS SECTION 21 4.1 Traffic 21 4.2 Route Cross Section 21 5 OPTIONS CATEGORISATION 25 5.1 Stage 1: Preliminary Options Assessment 25 6 ROUTE CORRIDOR OPTIONS 27 6.1 Introduction 27 6.2 Route Corridor Options 27 6.3 Methodology of Comparison 33 6.4 Route Corridor Consultation 33 7 ENGINEERING ASSESSMENT 34 National Road Design Department, Sligo County Council Page 3 N4 Collooney to Castlebaldwin Proposed Road Development Addendum to the Route Selection Report 7.1 Introduction 34 7.2 Existing Road Network 34 7.3 Road Geometry 34 7.4 Drainage 34 7.5 Junction and Structures Proposals 34 7.6 Utilities 35 7.7 Ground Conditions 35 7.8 Assessment and Evaluation – Engineering 36 8 IMPACT ON ARCHAEOLOGY 37 9 ECOLOGY 39 9.1 Introduction 39 9.2 Description of the Existing Environment within the Study Area 39 9.3 Route Corridor Options evaluation 42 9.4 Preferred Route Selection and Conclusions 49 9.5 Ecology Plates 51 10 AGRICULTURE AND NON-AGRICULTURAL PROPERTY 54 10.1 Agriculture 54 10.2 Non‐Agricultural Property 54 11 AIR QUALITY AND CLIMATE 56 11.1 Introduction 56 11.2 Assessment of Route Corridor Options 57 12 NOISE AND VIBRATION 58 12.1 Introduction 58 12.2 Appraisal Methodology 58 12.3 Description of the Existing Environment 58 12.4 Assessment of Route Corridor Options 58 12.5 Conclusions 60 National Road Design Department, Sligo County Council Page 4 N4 Collooney to Castlebaldwin Proposed Road Development Addendum to the Route Selection Report 13 IMPACT ON LANDSCAPE 61 13.1 Introduction 61 13.2 Study Approach 61 13.3 Description of the Existing Environment 63 13.4 Visual Amenity and Sensitivity 64 13.5 Planning Context 64 13.6 Description of Route Corridor Options 65 13.7 Visual Impact Assessment 65 13.8 Landscape Impacts 67 13.9 Conclusion 69 14 SOILS AND GEOLOGY 72 14.1 Overview 72 14.2 Soils and Subsoil’s 72 14.3 Bedrock 74 15 HYDROLOGY, FLOODING AND HYDROGEOLOGY 75 15.1 Hydrology 75 15.2 Flooding 75 15.3 Hydrogeology 77 16 SOCIO ECONOMIC/ COMMUNITY 78 16.1 Regional Context 78 16.2 Economic Activity and Tourism 78 16.3 Assessment of Route Corridor Options 78 16.4 Impact on Demography 79 16.5 Impact on Residential Properties and Zoned Lands 79 16.6 Impact on Community Facilities and Businesses 80 16.7 Impact on Tourism Industry 80 16.8 Beneficial Impacts 81 16.9 Impact on Policies and Plans 81 National Road Design Department, Sligo County Council Page 5 N4 Collooney to Castlebaldwin Proposed Road Development Addendum to the Route Selection Report 16.10 Planning Applications 81 16.11 Relative impacts of route options 81 16.12 Conclusions 82 16.13 Ranking 83 17 ECONOMY ASSESSMENT 84 17.1 Cost Estimation 84 17.2 Cost Benefit Analysis 84 18 CONCLUSION OF COMPARISON OF ROUTE OPTIONS 87 18.1 Engineering Considerations 87 18.2 Economic 88 18.3 Environmental 89 18.4 Conclusion of Route Selection Process 98 19 THE ONLINE UPGRADE 103 19.1 General 103 19.2 Initial Options Considerations 103 19.3 Determination of the Optimum Solution 106 20 APPENDIX 1: FIGURES 117 National Road Design Department, Sligo County Council Page 6 N4 Collooney to Castlebaldwin Proposed Road Development Addendum to the Route Selection Report Tables TABLE 6‐1: ACCIDENT RATES BY ROAD TYPES ...................................................................................................... 29 TABLE 6‐2: AVERAGE NUMBER OF CASUALTIES PER ACCIDENT ........................................................................... 30 TABLE 6‐3: CHANGES TO LOCAL ROAD TREATMENT FROM THAT CONSIDERED AT ROUTE SELECTION STAGE ... 31 TABLE 6‐4: HORIZONTAL ALIGNMENT, CHANGES TO AVOID/REDUCE ENVIRONMENTAL IMPACTS ................... 32 TABLE 6‐5: VERTICAL ALIGNMENT, CHANGES TO AVOID/REDUCE ENVIRONMENTAL IMPACTS ......................... 32 TABLE 7‐1: PERCENTAGE PASSING SIGHT DISTANCE ACHIEVED. ......................................................................... 34 TABLE 7‐2: STRUCTURES AND JUNCTION STRATEGY PROPOSED WITHIN THE RSR (2002). ................................. 35 TABLE 7‐3: SOIL AND SUBSOIL GEOLOGY ............................................................................................................. 35 TABLE 8‐1: IMPACT OF ROUTE OPTIONS ON ARCHAEOLOGY .............................................................................. 37 TABLE 8‐2: IMPACT OF ROUTE OPTIONS ON ARCHAEOLOGY .............................................................................. 38 TABLE 9‐1: DESIGNATED NATURA 2000 SITES WITHIN THE ZONE OF INFLUENCE OF THE PROPOSED ROUTE OPTIONS. ..................................................................................................................................................... 40 TABLE 9‐2: COUNTY BIODIVERSITY SITES WITHIN THE ZONE OF INFLUENCE OF THE PROPOSED ROUTE OPTIONS, TAKEN FROM THE SLIGO COUNTY DEVELOPMENT PLAN (2011‐2017) AND THE ‘COUNTY SLIGO WETLAND SURVEY’ REPORTS (WILSON ET AL., 2008, 2009, 2011A AND 2011B). ...................................... 41 TABLE 9‐3: AQUATIC HABITATS INCLUDING WATERCOURSES AND LAKE WATERBODIES IDENTIFIED WITHIN THE ZONE OF INFLUENCE OF THE PROPOSED ROUTE OPTIONS. ....................................................................... 41 TABLE 9‐4: ECOLOGICAL RECEPTORS IDENTIFIED WITHIN THE ZONE OF INFLUENCE OF ROUTE OPTION 1. ....... 43 TABLE 9‐5: ECOLOGICAL RECEPTORS IDENTIFIED WITHIN THE ZONE OF INFLUENCE OF ROUTE OPTION 2. ....... 44 TABLE 9‐6: ECOLOGICAL RECEPTORS IDENTIFIED WITHIN THE ZONE OF INFLUENCE OF ROUTE OPTION 3. ....... 44 TABLE 9‐7: ECOLOGICAL RECEPTORS IDENTIFIED WITHIN THE ZONE OF INFLUENCE OF ROUTE OPTION 4. ....... 45 TABLE 9‐8: ECOLOGICAL RECEPTORS IDENTIFIED WITHIN THE ZONE OF INFLUENCE OF ROUTE OPTION 5. ....... 46 TABLE 9‐9: ECOLOGICAL RECEPTORS IDENTIFIED WITHIN THE ZONE OF INFLUENCE OF ROUTE OPTION 6. ....... 47 TABLE 9‐10: COMPARISON OF POTENTIAL IMPACTS AFFECTING ECOLOGICAL RECEPTORS IDENTIFIED FOR THE SIX ROUTE CORRIDOR OPTIONS, WITH AN ADDITION OF ROUTE OPTION 6 + (DESIGN PROCESS ALTERNATIVES). THE NUMBER OF EACH IMPACT RECEPTORS AFFECTED WITHIN EACH CATEGORY IS PRESENTED IN THE VERTICAL COLUMN FOR EACH PROPOSED ROUTE OPTION. THIS IS THEN ADDED TO GIVE A SUM TOTAL FOR EACH ROUTE. THOSE SITES REQUIRING LANDTAKE WITHIN A NATURA 2000 SITE ARE FURTHER NEGATIVELY WEIGHTED AGAINST. ...................................................................................... 50 TABLE 10‐1: IMPACTS ON NON‐AGRICULTURAL PROPERTY FOR EACH ROUTE OPTION ...................................... 55 TABLE 11‐1: THE NUMBER OF PROPERTIES SENSITIVE TO AIR QUALITY WITHIN 50M OF EACH ROUTE CORRIDOR. .................................................................................................................................................. 57 TABLE 12‐1: OVERALL POTENTIAL IMPACT RATING. ............................................................................................ 59 TABLE 12‐2: MAXIMUM PERMISSIBLE NOISE LEVELS AT THE FAÇADE OF DWELLINGS DURING CONSTRUCTION. .................................................................................................................................................................... 60 TABLE 12‐3: ALLOWABLE VIBRATION VELOCITY (PEAK PARTICLE VELOCITY) AT THE CLOSEST PART OF ANY SENSITIVE PROPERTY TO THE SOURCE OF VIBRATION. .............................................................................. 60 TABLE 13‐1: ALTERNATIVE ROUTES ASSESSMENT: ESTIMATED NUMBER OF PROPERTIES WITH CONSIDERABLE ADVERSE VISUAL IMPACTS FROM OCCUPIED PROPERTIES ........................................................................ 66 TABLE 13‐2: ALTERNATIVE ROUTES ASSESSMENT: POTENTIAL TO IMPACT CONSIDERABLY ON VIEWS TO ROAD USERS, HERITAGE SITES AND DESIGNATED SCENIC ROUTES ...................................................................... 66 National Road Design Department, Sligo County Council Page 7 N4 Collooney to Castlebaldwin Proposed Road Development Addendum to the Route Selection Report TABLE 13‐3: PHYSICAL CHARACTERISTICS OF ROUTE CORRIDOR OPTIONS ........................................................