Chapter 9: Road drainage and the water environment

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M1 JUNCTION 19 IMPROVEMENT ENVIRONMENTAL STATEMENT VOLUME 2 CHAPTER 9 – ROAD DRAINAGE AND THE WATER ENVIRONMENT Feature & Attribute / Service Flood Risk Floodplain: Conveyance of flood flows Quality Indicator Scale A , Details and Grading Local: Minor alluvial & river terrace gravel deposits aquifer with low leaching soils Local: Non aquifer Lower Lias Group strata & Glacial Till Surface waters Regional / Local: Proposed Development within River Avon and Clay Coton Yelvertoft Brook 1:100 year indicative floodplain Groundwater Local: Alluvial and river terrace gravel deposits with water table in places below 1m Local: Clay soils Importance Low Low Medium Medium Low A The majority of features are deemed to be of ‘local’ scale. Regional / national status has been afforded to important main rivers, public water supplies, major aquifers etc. B Conservation value is not included; this is covered within Chapter 3 Ecology and Nature Conservation B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 20
M1 JUNCTION 19 IMPROVEMENT ENVIRONMENTAL STATEMENT VOLUME 2 CHAPTER 9 – ROAD DRAINAGE AND THE WATER ENVIRONMENT 9.5 MITIGATION 9.5.1 During the construction and subsequent operation of the junction improvement, there would be a number of activities which have the potential to impact upon controlled waters, as described below. Potential Impacts Construction 9.5.2 The following potential impacts could occur during construction:- Operation • Generation of surface runoff containing high suspended solids arising from various activities including soil stripping and landscaping, demolition, excavation, infilling, embankments, importation and exportation of soil or fill material, storage and stockpiling, dust suppression, wheel washes, etc. • Spillages of oil, fuel or other construction chemicals • Piling for any of the larger structures • Watercourse crossings and diversions • Works within the floodplain • Disturbance of contaminated land, such as the former landfill • Dewatering • Creation and removal of ponds, diversion and culverting of existing watercourses • Development within the floodplain 9.5.3 The operational phase covers the use of the junction once construction has been completed. The following potential impacts could occur over the long term:- • Highway runoff discharges including spillages of predominantly oil/fuel and de-icing • Piled foundations providing pathways for migration • Changes to land drainage, surface runoff and water quality Construction Environmental Management Plan 9.5.4 A Construction Environmental Management Plan (CEMP) is being developed for the junction improvement. An outline CEMP 34 has been prepared and is reported in Volume 1 of this ES. This identifies potential areas and / or activities which may lead to water pollution or other adverse consequences, and sets out good site practice and management which would avoid or minimise such outcomes while also providing instruction on emergency response procedures to be adopted following a specific incident. The outline CEMP sets out the key measures that would be implemented on the site to manage water resources on the site throughout the construction works. 9.5.5 Proposed environmental protection measures relevant to protection of the water environment would include:- • First construction activities would be the construction of drainage ponds, and the extension of the drainage outfall culvert and ditch system • Fuel storage: All fuel would be stored, in accordance with the Control of Pollution (Oil Storage) Regulations 2001 35 , away from watercourses, drains and other sensitive receptors. Emergency spillage clean up kits would be provided at all refuelling points B0531000_ID_70-EIA Vol 2 Chap 9 Road Drainage and the Water Environment Final Rev 4.doc Page 21
Page 1: M1 Junction 19 Improvement Environm
Page 4 and 5: M1 JUNCTION 19 IMPROVEMENT ENVIRONM
Page 71 and 72: Appendix A - Pollution and Spillage
Page 73: Method D - Assessment of Pollution
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M1 JUNCTION 19 IMPROVEMENT ENVIRONM
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Groundwater: Hydrocarbons Hydrogeol
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M1 JUNCTION 19 IMPROVEMENT ENVIRONM
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Non Technical Summary Skanska Const
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Contents 1 Introduction 1 1.1 Overv
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1 Introduction 1.1 Overview Jacobs
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2 Policy Review 2.1 Planning Contex
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When the both the ‘Flood Zone’
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3 Flood Risk to the Proposed Develo
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3.2 Fluvial Flooding - Ordinary Wat
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Major earthworks affecting surface
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3.7 Flooding from Infrastructure Fa
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3.9 Summary of Risks to Site Table
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4 Impacts of the Proposed Developme
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4.6 Summary of Flood Impacts from D
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5 Proposed Mitigation Measures 5.1
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The extents of this problem are cur
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5.7 Summary of Recommended Mitigati
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6 Residual Risks The level of flood
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7 PPS25 Sequential and Exception Te
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8 Conclusion The M1 Junction 19 Imp
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Appendix A Existing Layout, Environ
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Appendix B Contractor’s Proposals
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Appendix C Hydrogeological Assessme
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Memorandum Fairbairn House, Ashton
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Memorandum (Continued) Page 3 of 6
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Memorandum (Continued) Page 5 of 6
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Appendix D Volume Distribution for
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Floodplain compensation area - elev
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Depth Bands (m) TOTAL (m³) Area Re
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