QPL.GCAL.LONGLANDS.H&HIA18.02 Green Circle Aggregates Limited Longlands Quarry Corntown, Vale of Glamorgan Planning Application for Lateral Extension Hydrological & Hydrogeological Impact Assessment 22nd February 2019 Technology Centre, Wolverhampton Science Park, Glashier Drive, Wolverhampton West Midlands, WV10 9RU. Tel: 01902 824111, Fax: 01902 824112 email: [email protected], web: http://www.bclhydro.co.uk Registered Office: 33, Wolverhampton Road, Cannock, West Midlands, WV11 1AP Registered in England & Wales. Company Registration Number: 4043373 This Page Intentionally Left Blank Longlands Quarry, Corntown, Vale of Glamorgan, Planning Application for Lateral Extension Hydrological & Hydrogeological Impact Assessment Document History Date Version BCL Ref. Comments Issued to No. 31/12/18 01 QPL.GCAL.LONGLANDS.H&HIA18.01 Initial Draft for Client & Agent review. Chris Tinsley, Quarryplan 22/02/19 02 QPL.GCAL.LONGLANDS.H&HIA18.02 Final Draft for Submission Report Prepared By Report Checked By Gavin Chaplin B.Sc. M.Sc. Henry Lister B.Sc. M.Sc. Principal Hydrogeologist, Company Secretary & Director Principal Hydrogeologist & Director Green Circle Aggregates Limited Longlands Quarry Corntown, Vale of Glamorgan Planning Application for Lateral Extension Hydrological & Hydrogeological Impact Assessment 22nd February 2019 QPL.GCAL.LONGLANDS.H&HIA18.02 22nd February 2019 This Page Intentionally Left Blank Longlands Quarry, Corntown, Vale of Glamorgan, Planning Application for Lateral Extension Hydrological & Hydrogeological Impact Assessment Contents Page Number 1 INTRODUCTION........................................................................1 1.1 Background......................................................................................................1 1.2 Competence.....................................................................................................1 1.3 Technical Difficulties.......................................................................................2 2 APPROACH TO ASSESSMENT.......................................................3 2.1 Scope of Assessment.......................................................................................3 2.1.1 National Policy & Guidance...................................................................3 2.1.2 Local Policy & Guidance........................................................................3 2.1.3 Project Specific Guidance: Pre Application Advice.................................3 2.2 Methodology & Outcomes.............................................................................4 2.3 Information Sources........................................................................................4 2.4 Site Reconnaissance........................................................................................4 3 BASELINE CONDITIONS...............................................................5 3.1 Background......................................................................................................5 3.2 Location............................................................................................................5 3.3 Topography......................................................................................................6 3.4 Land Use & Site Composition..........................................................................6 3.5 Potentially Contaminating Historical Site Activities.......................................7 3.6 Designated Sites of Ecological Importance....................................................7 QPL.GCAL.LONGLANDS.H&HIA18.02 22nd February 2019 Longlands Quarry, Corntown, Vale of Glamorgan, Planning Application for Lateral Extension Hydrological & Hydrogeological Impact Assessment 3.7 Landfill Sites.....................................................................................................8 3.8 Geology............................................................................................................9 3.8.1 Solid Geology......................................................................................10 Regional...............................................................................................................10 Local Carboniferous Strata.................................................................................10 Local Jurassic Strata............................................................................................10 3.8.2 Superficial Geology.............................................................................11 3.9 Rainfall...........................................................................................................12 3.9.1 Long Term Area Averages...................................................................12 3.9.2 Effective Rainfall.................................................................................12 3.10 Hydrology......................................................................................................13 3.10.1 Background.........................................................................................13 3.10.2 Water Framework Directive River Basin District..................................13 3.10.3 WFD Catchments................................................................................13 3.10.4 Drinking Water Protected Area: Surface Water...................................14 3.10.5 Catchment Abstraction Management Strategy....................................14 Background.........................................................................................................14 Surface Water Resource Availability Status......................................................15 3.10.6 Surface Water-Courses & Waterbodies...............................................15 Ewenny River......................................................................................................15 Streams...............................................................................................................16 Brocastle Brook...........................................................................................16 Cottage Wood Brook...................................................................................17 Corntown Brook..........................................................................................17 Dry Valley............................................................................................................18 Waterbodies.......................................................................................................18 Underlying Geology............................................................................................18 3.10.7 Water Features Survey........................................................................19 3.10.8 Surface Water Quality.........................................................................20 3.10.9 Hydrological Characteristics of Soils....................................................20 3.10.10 Greenfield Runoff Rates......................................................................20 3.10.11 Flood Risk Zonation.............................................................................21 Fluvial Flooding...................................................................................................21 Surface Water Flooding......................................................................................22 3.10.12 Surface Water Abstractions.................................................................22 QPL.GCAL.LONGLANDS.H&HIA18.02 22nd February 2019 Longlands Quarry, Corntown, Vale of Glamorgan, Planning Application for Lateral Extension Hydrological & Hydrogeological Impact Assessment 3.10.13 Site Water Management.....................................................................22 Water Supply & Sanitation.................................................................................22 Storage & Handling of Potentially Contaminating Fluids.................................22 Drainage..............................................................................................................23 Rudimentary Water Balance..............................................................................23 3.11 Hydrogeology................................................................................................24 3.11.1 Background.........................................................................................24 3.11.2 Hydrostratigraphy...............................................................................24 3.11.3 Aquifer Classification...........................................................................25 The Carboniferous Aquifer.................................................................................25 Jurassic Strata.....................................................................................................25 3.11.4 WFD Groundwater Bodies...................................................................25 3.11.5 Drinking Water Protected Area: Groundwater....................................25 3.11.6 Groundwater Resource Availability Status...........................................25 3.11.7 Source Protection Zones.....................................................................25 3.11.8 Groundwater Vulnerability Zonation...................................................26 3.11.9 Groundwater Flow Mechanisms..........................................................26 Overview.............................................................................................................26