Swarkestone Quarry: Discharge Permit Variation Application 11 September 2020 T1.01 Swarkestone Quarry: Discharge Permit Variation Application Prepared for Tarmac Trading Limited Meeting Street Quorn Loughborough LE12 8EX Report reference: 330201435R1, September 2020 Report status: Final CONFIDENTIAL New Zealand House, 160-162 Abbey Foregate, Registered Office: Shrewsbury, Shropshire Stantec UK Ltd SY2 6FD Buckingham Court Kingsmead Business Park Telephone: +44 (0)1743 276 100 Frederick Place, London Road Facsimile: +44 (01743 248 600 High Wycombe HP11 1JU Registered in England No. 1188070 Swarkestone Quarry: Discharge Permit Variation Application SWARKESTONE QUARRY: DISCHARGE PERMIT VARIATION APPLICATION This report has been prepared by Stantec UK Ltd (Stantec) in its professional capacity as environmental specialists, with reasonable skill, care and diligence within the agreed scope and terms of contract and taking account of the manpower and resources devoted to it by agreement with its client and is provided by Stantec solely for the internal use of its client. The advice and opinions in this report should be read and relied on only in the context of the report as a whole, taking account of the terms of reference agreed with the client. The findings are based on the information made available to Stantec at the date of the report (and will have been assumed to be correct) and on current UK standards, codes, technology and practices as at that time. They do not purport to include any manner of legal advice or opinion. New information or changes in conditions and regulatory requirements may occur in future, which will change the conclusions presented here. This report is confidential to the client. The client may submit the report to regulatory bodies, where appropriate. Should the client wish to release this report to any other third party for that party’s reliance, Stantec may, by prior written agreement, agree to such release, provided that it is acknowledged that Stantec accepts no responsibility of any nature to any third party to whom this report or any part thereof is made known. Stantec accepts no responsibility for any loss or damage incurred as a result, and the third party does not acquire any rights whatsoever, contractual or otherwise, against Stantec except as expressly agreed with Stantec in writing. Report Reference: 330201435R1 Report Status: Final Swarkestone Quarry: Discharge Permit Variation Application Name Signature Author Chris Woodhouse Checked by Andrew Tait Reviewed by Barnaby Harding Revision record: Issue Date Status Comment Author Checker Reviewer For external 1 10/09/2020 Draft report CDW AWT BCH review 1 11/09/2020 Final report CDW AWT BCH Report Reference: 330201435R1 Report Status: Final Swarkestone Quarry: Discharge Permit Variation Application Page i Contents 1 INTRODUCTION 1 1.1 Background 1 1.2 Pre-application Discussions 1 1.3 Application 1 1.3.1 Application forms 1 1.3.2 Application fee 2 1.4 Data Sources: 2 1.5 Report Structure 2 2 BASELINE CONDITIONS 4 2.1 Site Setting 4 2.2 Geology 4 2.2.1 Regional geology 4 2.2.2 Infilled ground and landfilling 6 2.3 Hydrogeology 6 2.3.1 Groundwater classification and systems 6 2.3.2 Groundwater levels and flows 6 2.3.3 Groundwater quality 6 2.4 Hydrology 7 2.4.1 Rainfall 7 2.4.2 Surface water features 8 2.4.3 Surface water flows 12 2.4.4 Flooding 14 2.4.5 Surface water quality 14 2.4.6 Surface water classification 14 2.4.7 Discharges 14 2.5 Receptors 15 2.5.1 Surface water features 15 2.5.2 Buildings and infrastructure 15 Report Reference: 330201435R1 Report Status: Final Swarkestone Quarry: Discharge Permit Variation Application Page ii 2.5.3 Highways and rights of way 15 2.5.4 Designated sites 15 2.5.5 Licenced abstractions 15 2.5.6 Private water supplies 16 3 PROPOSED VARIATION 17 3.1 Existing Discharge Activity Permit 17 3.2 Proposed Site Water Management and Variation 17 3.2.1 Outline 17 3.2.2 Dewatering 17 3.2.3 Discharge of dewatering effluent 18 4 IMPACT ASSESSMENT 20 4.1 Impacts of Dewatering on the Milton Brook 20 4.2 Impacts from the Proposed Discharge Variation 20 4.2.1 Overview 20 4.2.2 A1 Impacts on water quality 21 4.2.3 B1 Impacts on receiving flows and levels 21 4.2.4 B2 Diversion of baseflow from one catchment to another 22 4.3 Summary 23 4.4 Monitoring Plan and Proposed Conditions 23 4.4.1 Environmental management system 23 4.4.2 Proposed mitigation measures 23 4.4.3 Proposed monitoring 24 5 SUMMARY 25 5.1 Non-Technical Summary of Application 25 5.2 Permit Variation Requirements 25 5.3 Impact Assessment Summary 26 FIGURES Figure 1.1 Site location 3 Figure 2.1 Map of LiDAR topography around the Site 5 Report Reference: 330201435R1 Report Status: Final Swarkestone Quarry: Discharge Permit Variation Application Page iii Figure 2.2 Neighbouring surface water features and discharge permits 11 Figure 2.3 Photograph of concrete structure looking north at downstream end of Milton Brook (Milton Brook pool to the left and River Trent on the right) 12 Figure 3.1 Proposed Site water management, including existing discharge locations and proposed variation 19 TABLES Table 2.1 Groundwater quality summary1 7 Table 2.2 Rainfall data statistics for Clay Mills rain gauge (October 1982 – June 2020)1 8 Table 2.3 Flow statistics for the River Trent at Shardlow (CEH, 2020) 13 Table 2.4 Other discharge activity permits in the Milton Brook catchment 15 Table 2.5 Abstractions within 3 km of the Site. 16 Table 4.1 Potential impacts of dewatering and water transfer 20 Table 4.2 Qualitative assessment of impacts 23 Table 5.1 Summary of quantities requiring a discharge activity permit and proposed rates 26 APPENDICES Appendix A Application Forms Appendix B Pre-application Advice Appendix C Additional Information for Part A Appendix D Existing Discharge Activity Permit Appendix E Summary of Environmental Management System Appendix F Hydrogeological Impact Assessment & Flood Risk Assessment Appendix G Site Visit Photographs Appendix H Phasing Drawings Appendix I Impact Assessment Methodology Appendix J Environmental Management System (Discharge) Report Reference: 330201435R1 Report Status: Final Swarkestone Quarry: Discharge Permit Variation Application Page 1 1 Introduction 1.1 Background Stantec UK Ltd (Stantec) has been engaged by Tarmac Aggregates Ltd (Tarmac) to prepare and submit an application for a discharge activity permit variation related to the southern extension to the existing Swarkestone Quarry in Derbyshire. The planning application for the southern extension (the Site) was approved by Derbyshire County Council (DCC) on 5 November 2018. The planning permission allows excavation of sand and gravel mineral with restoration to a mixture of agriculture and nature conservation; with some filling with inert restoration material (subject to obtaining an appropriate waste environmental permit). The Site is located on the southern, true right, bank of the River Trent, 1.3 km south-west of Barrow- upon-Trent and 1.9 km east of Repton. Figure 1.1 shows the Site location. The Site is currently mostly used as arable agricultural land and lies south of the existing Swarkestone Quarry that is situated north of the River Trent on the opposite bank. Excavated sand and gravel will be conveyed from the Site, via a Bailey bridge (currently under construction), to the existing Swarkestone Quarry for mineral processing. Tarmac proposes to dewater the quarry void in a series of phases to work the mineral dry and to allow deposition of imported inert fill material. Stantec, on behalf of Tarmac, submitted a transfer licence application to the Environment Agency (EA) on 13 September 2019 (ID NPS/WR/032339). This application was removed by the EA on 10 February 2020. On 8 June 2020, Stantec submitted a second transfer licence application on behalf of Tarmac (ID NPS/WR/033921). In support of the planning application for the Site, Golder Associates (UK) Ltd (Golder Associates) prepared a Hydrogeological Impact Assessment (HIA) (Golder Associates, 2018) which is provided in Appendix F. This HIA suggests that the proposed dewatering could cause a significant impact on flows within the Milton Brook (located south of the Site – see Figure 1.1). This potential impact is to be mitigated by augmenting the Milton Brook with dewatering effluent under the terms of a discharge activity permit. The EA has advised that this can be achieved by varying the existing discharge activity permit (see Section 1.2). 1.2 Pre-application Discussions Stantec submitted a request for basic pre-application advice on 16 July 2020. The EA responded in writing on 23 July 2020 (ref. T/36/46073/T/V004). A copy of this response is provided in Appendix B. The pre-application advice from the EA states that Tarmac can vary the existing discharge activity permit (ID: T/36/46073/T) to add the Milton Brook as an additional discharge location. Other than the correspondence provided in Appendix B, there have been no further pre-application discussions with the EA. 1.3 Application 1.3.1 Application forms This report provides the overarching document containing all necessary information for the application. It is accompanied by the required application forms (as specified by the EA in the pre- Report Reference: 330201435R1 Report Status: Final Swarkestone Quarry: Discharge Permit Variation Application Page 2 application advice (see Appendix B)). The application forms are provided in Appendix A and include the following: Part A - About you (EPA Version 13, January 2020); Part C2 - General – varying a bespoke permit (EPC2 Version 13, January 2020); Part B6 – Variation to a bespoke water discharge activity and groundwater (point source) activity (EPC6 Version 11, July 2018); and Part F1 - Charges and declarations (EPF1 Version 12, January 2020).