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Nnb Generation Company Ltd NNB-209-REP-000808 Version 1.0 Company Document NOT PROTECTIVELY MARKED NNB GENERATION COMPANY LTD ALDHURST FARM HABITAT CREATION SCHEME WATER DISCHARGE ACTIVITY ENVIRONMENTAL PERMIT APPLICATION © 2014 Published in the United Kingdom by NNB Generation Company Limited (NNB GenCo), 90 Whitfield Street - London, W1T 4EZ. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, including photocopying and recording, without the written permission of the copyright holder NNB GenCo, application for which should be addressed to the publisher. Such written permission must also be obtained before any part of this publication is stored in a retrieval system of any nature. Requests for copies of this document should be referred to NNB Generation Company Limited (NNB GenCo), 90 Whitfield Street - London, W1T 4EZ. The electronic copy is the current issue and printing renders this document uncontrolled NNB Generation Company Limited Registered in England and Wales. Registered No. 6937084 Registered Office: 40 Grosvenor Place London SW1X 7EN Page 1 of 16 NOT PROTECTIVELY MARKED NNB-209-REP-000808 Version 1.0 NNB Company Document ALDHURST FARM WATER DISCHARGE ACTIVITY ENVIRONMENTAL PERMIT APPLICATION NOT PROTECTIVELY MARKED APPROVAL SIGN-OFF: ALDHURST FARM HABITAT CREATION SCHEME WATER DISCHARGE ACTIVITY ENVIRONMENTAL PERMIT APPLICATION Originated by: Title: Consultant Associate Director, Water Date:19/12/14 Management Title: Environmental Compliance Specialist Date:22/12/14 Reviewed by: Title: Consultant Technical Director, Date:19/12/14 Water Management Approved by: Title: Head of Environment Date: 22/12/2014 DOCUMENT CONTROL Version Purpose Amendment By Date 0.1 For Review Draft issue for review 17/11/2014 1.0 Issued 22/12/2014 NNB Generation Company Limited Registered in England and Wales. Registered No. 6937084 Registered Office: 40 Grosvenor Place London SW1X 7EN Page 2 of 16 NOT PROTECTIVELY MARKED NNB-209-REP-000808 Version 1.0 NNB Company Document ALDHURST FARM WATER DISCHARGE ACTIVITY ENVIRONMENTAL PERMIT APPLICATION NOT PROTECTIVELY MARKED TABLE OF CONTENTS 1 INTRODUCTION ..................................................................................................................... 5 1.1 Purpose of document ........................................................................................................ 5 1.2 Structure of document ....................................................................................................... 5 1.3 Requirement for Water Discharge Activity Environmental Permit ................................ 5 1.4 Heritage and nature conservation pre-application screen ............................................. 6 2 PART B2 GENERAL – NEW BESPOKE PERMIT ................................................................. 7 2.1 Form Contents .................................................................................................................... 7 2.2 Question 3d Management Systems (all) .......................................................................... 7 2.2.1 Formation of Groundwater Basins .................................................................................... 8 2.2.2 Excavation Management .................................................................................................. 8 2.2.3 Groundwater Management ............................................................................................... 8 2.3 Question 5 Supporting Information .................................................................................. 9 2.3.1 Question 5a Provide a plan (or plans) for the site but not any mobile plant ..................... 9 2.3.2 Question 5c Provide a non-technical summary of your application .................................. 9 2.4 Question 6 Environmental risk assessment .................................................................... 9 3 PART B6 – NEW BESPOKE WATER DISCHARGE ACTIVITY AND GROUNDWATER (POINT SOURCE) ACTIVITY ....................................................................................................... 11 3.1 Form Contents .................................................................................................................. 11 3.2 Question 4 How much do you want to discharge? ....................................................... 11 3.3 Question 6 How will the effluent be treated? ................................................................. 12 3.4 Question 7 What will be in the effluent? ........................................................................ 15 3.5 Question 8 Monitoring arrangements ............................................................................ 15 3.6 Question 11 Where will the effluent discharge to? ....................................................... 15 APPENDIX A APPLICATION FORMS (A, B2, B6, F2) APPENDIX B HERITAGE AND NATURE CONSERVATION PRE APPLICATION SCREEN RESULTS APPENDIX C PART B6, QUESTION 4: METHODOLOGY FOR THE CALCULATION OF DISCHARGE VOLUMNES AND RATES NNB Generation Company Limited Registered in England and Wales. Registered No. 6937084 Registered Office: 40 Grosvenor Place London SW1X 7EN Page 3 of 16 NOT PROTECTIVELY MARKED NNB-209-REP-000808 Version 1.0 NNB Company Document ALDHURST FARM WATER DISCHARGE ACTIVITY ENVIRONMENTAL PERMIT APPLICATION NOT PROTECTIVELY MARKED LIST OF FIGURES Figure Name Page 1 Operational Site Layout 6 2 Site Location, discharge and monitoring locations. 16 3 Suspended Solids (mg/l) 13 4 pH (pH Units) 13 5 Dissolved Oxygen (% saturation) 14 6 Dissolved Oxygen (mg/) 14 LIST OF TABLES Table Name Page 2.1 Location of answers to questions on Part B2 7 3.1 Location of answers to questions on Part B6 11 3.2 Estimated dewatering rates for a groundwater basin 12 NNB Generation Company Limited Registered in England and Wales. Registered No. 6937084 Registered Office: 40 Grosvenor Place London SW1X 7EN Page 4 of 16 NOT PROTECTIVELY MARKED NNB-209-REP-000808 Version 1.0 NNB Company Document ALDHURST FARM WATER DISCHARGE ACTIVITY ENVIRONMENTAL PERMIT APPLICATION NOT PROTECTIVELY MARKED 1 INTRODUCTION 1.1 Purpose of document NNB Generation Company Limited (Company Number 06937084) is part of EDF Energy. For the purpose of this document, NNB Generation Company Limited is referred to as NNB GenCo. This document contains information, submitted as a part of the Environmental Permit Application for a Water Discharge Activity, relating to construction phase dewatering at Aldhurst Farm, Leiston, Suffolk (the Permit). This document comprises information to support Parts A, B1, B2 and F2 of Form EPA: Application for an environmental permit. Information presented within this document has been informed by discussions with the Environment Agency (EA) under pre-application number EPR-BB3899WR. 1.2 Structure of document The main body of this document provides supplementary information to support the following Parts of the Permit application: Section 2 Part B2 – supplementary information needed for completion of Part B2 Section 2 Part B6 – supplementary information needed for completion of Part B6 Information for Part A and Part F2 is contained entirely within the provided forms. All four completed Parts of the Permit application can be found in Appendix A. 1.3 Requirement for Water Discharge Activity Environmental Permit The operational use of the site is four groundwater fed basins which, under most conditions, will discharge to either the Leiston Beck or Aldhurst Valley Stream. The site will be planted and managed as a wetland area of a similar form to the reedbed and lowland ditch habitats within Sizewell Marshes Site of Special Scientific Interest (SSSI), which is located immediately downstream. A plan of the finished site can be seen in Figure 1. The site is currently an arable valley and the construction phase will entail the excavation and planting of the groundwater fed basins and perimeter ditches. The nature of these excavations means that construction will involve work below the groundwater table, leading to some dewatering activities and a subsequent requirement to discharge this water. The discharge will be comprised only of groundwater and any intercepted overland flow (surface water run-off) in the vicinity of the excavations. The presence of a SSSI immediately downstream, and the probable duration of the discharge for a period longer than 3 months (the construction phase is approximately 6-8 months), are the key drivers for the requirement for a Permit at this site.1 1 EA Regulatory Position Statement Temporary water discharges from excavations Version 3 June 2013 NNB Generation Company Limited Registered in England and Wales. Registered No. 6937084 Registered Office: 40 Grosvenor Place London SW1X 7EN Page 5 of 16 NOT PROTECTIVELY MARKED NNB-209-REP-000808 Version 1.0 NNB Company Document ALDHURST FARM WATER DISCHARGE ACTIVITY ENVIRONMENTAL PERMIT APPLICATION NOT PROTECTIVELY MARKED Figure 1 Operational site layout 1.4 Heritage and nature conservation pre-application screen A heritage and nature conservation pre-application screen has been applied for as a part of the permit application process. The information received from the Environment Agency as a result of this screen can be seen in Appendix B. NNB Generation Company Limited Registered in England and Wales. Registered No. 6937084 Registered Office: 40 Grosvenor Place London SW1X 7EN Page 6 of 16 NOT PROTECTIVELY MARKED NNB-209-REP-000808 Version 1.0 NNB Company Document ALDHURST FARM WATER DISCHARGE ACTIVITY ENVIRONMENTAL
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