Rooley Moor Wind Farm Environmental Statement Rooley Moor Wind Farm Chapter 7: Hydrology, Hydrogeology and Geology CPL PAGE i Rooley Moor Wind Farm Environmental Statement 7. Hydrology, Hydrogeology and Geology ..................................................................................................................................7-3 7.1 Introduction ..................................................................................................................................................................................7-3 7.2 Objectives ....................................................................................................................................................................................7-3 7.3 Statutory, Planning Policy, Legislation and General Guidance ....................................................................................................7-3 7.3.1 Statutory Planning Policy and Legislation ....................................................................................................................................7-3 7.3.2 General Guidance ........................................................................................................................................................................7-4 7.4 Consultation and Scoping ............................................................................................................................................................7-4 7.5 Methodology .................................................................................................................................................................................7-7 7.5.1 Baseline Determination ................................................................................................................................................................7-8 7.6 Baseline Conditions ...................................................................................................................................................................7-13 7.6.1 Study Area .................................................................................................................................................................................7-13 7.6.2 Climate and Topography ............................................................................................................................................................7-13 7.6.3 Statutory Designated Sites .........................................................................................................................................................7-13 7.6.4 Hydrology ...................................................................................................................................................................................7-14 7.6.5 Flood Risk ..................................................................................................................................................................................7-16 7.6.6 Geology and Peat ......................................................................................................................................................................7-18 7.6.7 Groundwater ..............................................................................................................................................................................7-20 7.6.8 Groundwater Dependent Terrestrial Ecosystems ......................................................................................................................7-21 7.6.9 Public Water Supplies and United Utilities Assets .....................................................................................................................7-23 7.6.10 Private Water Supplies (PWS) ...................................................................................................................................................7-24 7.7 Baseline Sensitivity ....................................................................................................................................................................7-25 7.7.1 Overall Surface Water Sensitivity ...............................................................................................................................................7-25 7.7.2 Overall Groundwater Sensitivity .................................................................................................................................................7-25 7.7.3 Overall Geology Sensitivity ........................................................................................................................................................7-25 7.8 Design Evolution ........................................................................................................................................................................7-26 7.9 Standard Practice Measures ......................................................................................................................................................7-26 7.9.1 Development of a Detailed Construction Method Statement (CMS) ..........................................................................................7-26 7.9.2 Development of a Construction Environmental Management Plan (CEMP) ..............................................................................7-26 7.9.3 Drainage Management Plan (DMP) ...........................................................................................................................................7-27 7.9.4 Water Quality Monitoring ............................................................................................................................................................7-27 7.9.5 Provision of an Environmental Clerk of Works (ECoW) .............................................................................................................7-28 7.10 Predicted Impacts ......................................................................................................................................................................7-28 7.10.1 Construction ...............................................................................................................................................................................7-28 7.10.2 Operation ...................................................................................................................................................................................7-33 7.10.3 Decommissioning .......................................................................................................................................................................7-35 7.11 Summary of Potential Impacts and Mitigation Measures ...........................................................................................................7-35 CPL PAGE i Rooley Moor Wind Farm Environmental Statement 7.12 Mitigation Measures ...................................................................................................................................................................7-41 7.12.1 Access Tracks ............................................................................................................................................................................7-41 7.12.2 Watercourse Crossings ..............................................................................................................................................................7-42 7.12.3 Wind Turbine Foundations and Hardstandings ..........................................................................................................................7-42 7.12.4 Substation Compound and Temporary Construction Compound ..............................................................................................7-43 7.12.5 Electric Cabling ..........................................................................................................................................................................7-43 7.12.6 Borrow Pits .................................................................................................................................................................................7-44 7.13 Residual Effects .........................................................................................................................................................................7-45 7.13.1 Construction ...............................................................................................................................................................................7-45 7.13.2 Operation ...................................................................................................................................................................................7-46 7.13.3 Decommissioning .......................................................................................................................................................................7-46 7.14 Cumulative Impacts ....................................................................................................................................................................7-46 7.15 Summary and Conclusions ........................................................................................................................................................7-48 Appendix 7.1: Private Water Supply Assessment Appendix 7.2: Outline Peat Management Plan Appendix 7.3: Peat Slide