A303 Stonehenge Improvement the “Parker Route”
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Balfour Beatty/Costain JV Highways Agency Temple Quay House 2 The Square Temple Quay Bristol BS1 6HA A303 Stonehenge Improvement The “Parker Route” Assessment Report Volume 1 January 2004 Document Reference No. P1A-HIG-GEN-R018 In association with Balfour Beatty A303 Stonehenge Improvement Balfour Beatty-Costain Parker Route Assessment Halcrow-Gifford Document Ref: P1A-HIG-GEN-R018 December 2003 A303 Stonehenge Improvement Balfour Beatty-Costain Parker Route Assessment Halcrow-Gifford Balfour Beatty-Costain Joint Venture Halcrow-Gifford Joint Venture 7 Mayday Road 2nd Floor Cross Keys House Thornton Heath Queen Street Surrey CR7 7XA Salisbury Wiltshire SP1 1EY Tel +44 (0)20 8684 6922 Tel 01722 342400 Fax +44 (0)20 8710 5151 Direct Tel +44 (0)20 8710 5060 Direct Fax +44 (0)20 8710 5222 The Balfour Beatty-Costain Joint Venture in association with the Halcrow-Gifford Joint Venture have prepared this report in accordance with the instructions of their client, the Highways Agency, for their sole and specific use. Any other persons who use any information contained herein do so at their own risk. Document Ref: P1A-HIG-GEN-R018 December 2003 A303 Stonehenge Improvement Balfour Beatty-Costain Parker Route Assessment Halcrow-Gifford Document Ref: P1A-HIG-GEN-R018 December 2003 A303 Stonehenge Improvement Balfour Beatty-Costain Parker Route Assessment Halcrow-Gifford Issue and Revision Record Rev Date Originator Checker Approver Description (Print) (Print) (Print) (Signature) (Signature) (Signature) A 20/01/04 Alex Gilbert Gareth Davies Stuart Final Draft Bromley Document Ref: P1A-HIG-GEN-R018 December 2003 A303 Stonehenge Improvement Balfour Beatty-Costain Parker Route Assessment Halcrow-Gifford Document Ref: P1A-HIG-GEN-R018 December 2003 A303 Stonehenge Improvement Balfour Beatty-Costain Parker Route Assessment Halcrow-Gifford CONTENTS VOLUME 1: REPORT AND APPENDICES 1 INTRODUCTION.....................................................................................................1 1.1 Background..................................................................................................1 1.2 Scope...........................................................................................................1 1.3 Highways Agency / Wiltshire County Council Responsibility and Roles ......2 2 EXISTING CONDITIONS........................................................................................3 2.1 Highway Network.........................................................................................3 2.2 Traffic Flows.................................................................................................3 2.3 Environmental Conditions ............................................................................3 3 DESCRIPTION OF THE ROUTE ............................................................................5 3.1 Introduction ..................................................................................................5 3.2 A303 Realignment .......................................................................................5 3.2.1 Western Tie-in Junction 5 3.2.2 Western Tie-in to A360 Junction (Ch. 0 – 10,000) 5 3.2.3 A360 Junction 6 3.2.4 A360 Junction to A345 Junction (Ch. 10,000 – 13,800) 6 3.2.5 A345 Junction 7 3.2.6 A345 Junction to the Eastern Tie-in (Ch. 13,800 – 25,700) 7 3.2.7 Eastern Tie-in Junction 8 3.3 Eastern Link.................................................................................................8 3.3.1 A303 Junction to A30 Junction (Ch. 0 – 3,500) 8 3.3.2 A30 Junction to A36 Junction (Ch. 3,500 – 7,200) 8 3.4 Treatment of the existing road network........................................................9 4 ENGINEERING ASSESSMENT ...........................................................................11 4.1 Highways ...................................................................................................11 4.1.1 Engineering Standards 11 4.1.2 Geology and Geotechnics 11 4.1.3 Earthworks 12 4.1.4 Surfacing 12 4.1.5 Drainage 12 4.1.6 Other Highway Features 13 4.1.7 Public Utilities 13 4.2 Structures ..................................................................................................14 Document Ref: P1A-HIG-GEN-R018 i December 2003 A303 Stonehenge Improvement Balfour Beatty-Costain Parker Route Assessment Halcrow-Gifford 4.2.1 General 14 4.2.2 Railway Bridges 14 5 ENVIRONMENTAL ASSESSMENT .....................................................................15 5.1 Introduction ................................................................................................15 5.2 Methodology ..............................................................................................15 5.3 Cultural Heritage........................................................................................17 5.3.1 Sources of Information 17 5.3.2 Baseline Conditions 17 5.3.3 Assessment of Impacts and Effects 27 5.3.4 Mitigation 33 5.3.5 Summary 34 5.4 Landscape .................................................................................................35 5.4.1 Sources of Information 35 5.4.2 Baseline conditions 35 5.4.3 Mitigation 40 5.4.4 Summary 40 5.5 Nature Conservation and Biodiversity........................................................43 5.5.1 Sources of Information 43 5.5.2 Baseline Conditions 43 5.5.3 Assessment of Impacts and Effects 45 5.5.4 Mitigation 53 5.5.5 Summary 53 5.6 Water .........................................................................................................55 5.6.1 Sources of Information 55 5.6.2 Baseline Conditions 55 5.6.3 Assessment of Impacts and Effects 59 5.6.4 Mitigation 63 5.6.5 Summary 64 5.7 Geology and Soils......................................................................................65 5.7.1 Sources of Information 65 5.7.2 Baseline Conditions 65 5.7.3 Assessment of Impacts and Effects 68 5.7.4 Mitigation 68 5.7.5 Summary 68 5.8 Noise and Vibration....................................................................................69 5.8.1 Sources of Information 69 5.8.2 Baseline Conditions 69 5.8.3 Assessment of Impacts and Effects 70 5.8.4 Mitigation 71 5.8.5 Summary 72 5.9 Air Quality ..................................................................................................73 5.9.2 Sources of Information 73 5.9.3 Baseline Conditions 74 5.9.4 Assessment of Impacts and Effects 75 5.9.5 Mitigation 76 Document Ref: P1A-HIG-GEN-R018 ii December 2003 A303 Stonehenge Improvement Balfour Beatty-Costain Parker Route Assessment Halcrow-Gifford 5.9.6 Summary 77 5.10 Pedestrians, cyclists, equestrians and community effects .........................79 5.10.1 Sources of Information 79 5.10.2 Baseline Conditions 79 5.10.3 Assessment of Impacts and Effects 79 5.10.4 Mitigation 86 5.10.5 Summary 86 5.11 Vehicle Travellers ......................................................................................87 5.11.1 Sources of Information 87 5.11.2 Baseline Conditions 87 5.11.3 Assessment of Impacts and Effects 87 5.11.4 Mitigation 89 5.11.5 Summary 89 5.12 Land Use ...................................................................................................91 5.12.1 Sources of Information 91 5.12.2 Baseline Conditions 92 5.12.3 Assessment of Impacts and Effects 94 5.12.4 Mitigation 100 5.12.5 Summary 100 5.13 Disruption Due to Construction ................................................................101 5.13.1 Key Construction activities 101 5.13.2 Assessment of Impacts and Effects 101 5.13.3 Mitigation 102 5.14 Policies and Plans....................................................................................103 5.14.1 Sources of Information 103 5.14.2 Baseline Conditions 103 5.14.3 Assessment of Impacts and Effects 103 5.14.4 Mitigation 108 5.14.5 Summary 108 6 TRAFFIC AND ECONOMIC ASSESSMENT......................................................109 6.1 Modelling methodology ............................................................................109 6.1.1 Sources of Data and Definition of Traffic Model 109 6.1.2 Development of Traffic Model 110 6.1.3 Traffic Model Validation 112 6.2 Forecasting ..............................................................................................117 6.3 Effect of the route.....................................................................................117 6.4 Economic Analysis...................................................................................120 6.4.1 Cost 120 6.4.2 Analysis 120 7 ALTERNATIVE OPTIONS..................................................................................123 7.1 Introduction ..............................................................................................123 7.2 Traffic Calming the Packway....................................................................123 Document Ref: P1A-HIG-GEN-R018 iii December 2003 A303 Stonehenge Improvement Balfour Beatty-Costain Parker Route Assessment Halcrow-Gifford 7.3 Western Fast Link ....................................................................................124 7.4 Removal of Western Tie-in Junction ........................................................125 7.5 Bypass for Shrewton................................................................................125 8 OVERALL SUMMARY .......................................................................................127 Document Ref: P1A-HIG-GEN-R018 iv December 2003 A303 Stonehenge Improvement Balfour Beatty-Costain Parker Route Assessment Halcrow-Gifford List of Tables Table 2.1: Summary of the existing