October 2019 Report No 4740/01-1 ALLINGTON EFW PROPOSED EXTENSION PHASE 1 DESK STUDY REPORT Carried out for: FCC ENVIRONMENT (UK) LTD Lead Consultant: AXIS P.E.D LTD ALLINGTON EFW PROPOSED EXTENSION PHASE 1 DESK STUDY REPORT Date: 10/10/2019 Report No 4740/01-1 Prepared for: Lead Consult: Prepared by: FCC Environment AXIS P.E.D Ltd TerraConsult Ltd. (UK) Ltd Camellia House Bold Business Centre Granville House 76 Water Lane Bold Lane, Sutton St Georges Road Wilmslow St. Helens, Merseyside Donnington Wood Cheshire WA9 4TX Telford, SK9 5BB Shropshire Telephone: 01925 TF2 7RA 291111 www.terraconsult.co.uk Phase 1 Geo-Environmental Assessment Allington EfW Proposed Extension, Allington. DOCUMENT INFORMATION AND CONTROL SHEET Document Status and Approval Schedule Report No. Title 4740/01 ALLINGTON EFWPROPOSED EXTENSION PHASE 1 DESKSTUDY REPORT Issue History Issue Status Date Contributors Signature Date 1 For Use 10/10/2019 Prepared By: N Anson 04/10/2019 N Anson BE(Civil) Reviewed & Approved By: L. Stock 10/10/2019 L. Stock MiEnvSc CSci DISCLAIMER This report should be read with the Service Constraints Report Limitations & Planning Requirements set out in Appendix A. October 2019 Report No. 4740/01 Issue 1 Phase 1 Geo-Environmental Assessment Allington EfW Proposed Extension, Allington. ALLINGTON EFWPROPOSED EXTENSION PHASE 1 DESK STUDY REPORT CONTENTS 1. INTRODUCTION ................................................................................................................... 1 1.1 Background Information ........................................................................................... 1 1.2. Development Proposals ........................................................................................... 1 1.3. Planning Status & Requirements ............................................................................ 3 1.4. Scope of the Investigation ........................................................................................ 3 2. SITE LOCATION AND DESCRIPTION............................................................................. 4 2.1 Site Location............................................................................................................... 4 2.2 Site Description .......................................................................................................... 5 2.3 History ......................................................................................................................... 6 3. ENVIRONMENTAL SETTING ............................................................................................ 7 3.1 Data Summary ........................................................................................................... 7 3.2 Geology ....................................................................................................................... 7 3.3 Mining and Quarrying ............................................................................................... 7 3.4 Hydrology, Flooding and Drainage ......................................................................... 8 3.5 Hydrogeology ............................................................................................................. 8 3.6 Industrial, Ecological, and Historical Use .............................................................. 9 5. CONCEPTUAL SITE MODEL AND PRELIMINARY QUALITATIVE HAZARD ASSESSMENT ................................................................................................................................ 18 5.1 Hazards Identified with the Proposed Extension ................................................ 18 5.2 Potential Sources of Contamination ..................................................................... 18 5.3 Potential Receptors of Contamination ................................................................. 19 5.4 Identification Pathways ........................................................................................... 19 5.5 Contaminant Linkages ............................................................................................ 21 5.6 Conceptual Site model ........................................................................................... 22 5.7 Preliminary Contamination Hazard Assessment ................................................ 24 5.8 Geotechnical Hazards Associated with the Development ................................ 26 6. CONCLUSION ..................................................................................................................... 28 6.1 Environmental Risk Assessment .......................................................................... 28 6.2 Geotechnical Risk Assessment............................................................................. 28 6.3 Recommendations for Further Work .................................................................... 29 6.4 Regulatory Liaison................................................................................................... 30 6.5 Health and Safety .................................................................................................... 30 REFERENCES ................................................................................................................................ 31 APPENDICES Appendix A Service Constraints, Report Limitations & Planning Requirements Appendix B Environmental Risk Assessment Methodology and Terminology Appendix C Photographs Appendix D GroundSure EnviroInsite Report Appendix E Ground Gas Risk Assessment & Possible Mitigation October 2019 Report No. 4740/01 Issue 1 Phase 1 Geo-Environmental Assessment Allington EfW Proposed Extension, Allington ALLINGTON EFW PROPOSED EXTENSION PHASE 1 DESKSTUDY REPORT 1. INTRODUCTION 1.1 Background Information 1.1.1 TerraConsult Limited was commissioned by Axis PED Ltd to carry out a preliminary site investigation on behalf of FCC Environment (UK) Ltd (FCC) for an area of land adjacent to the Existing Station in Kent, which shares the Project Site with the Proposed Extension. The purpose of the report is to provide information on conditions at the site for a proposed new EfW plant, hereafter referred to as the Proposed Extension. 1.1.2 This report has been devised to generally comply with the relevant principles and requirements of a range of guidance including: Part IIA of the Environment Protection Act, 1990; Contaminated Land (England) (Amendment) Regulations 2012 and Contaminated Land Statutory Guidance (DEFRA, April 2012); NPPF 2019 ‘National Planning Policy Framework’ BS5930:2015: “Code of practice for site investigations”; BS10175: 2011 +A2:2017 “Investigation of Potentially Contaminated Sites - Code of Practice”; DEFRA/Environment Agency (2004) Report CLR11 “Model Procedures for the Management of Land Contamination”; Environment Agency (2011) Report GPLC1 “Guiding Principles for Land Contamination”; and, Environment Agency (2013) Report GP3 “Groundwater protection: Principles and Practice” Version 1.1. 1.1.3 TerraConsult’s service constraints and report limitations are presented in Appendix A and a description of environmental risk assessment methodology and terminology is presented in Appendix B. 1.2. Development Proposals 1.2.1 The Proposed Extension is understood to comprise: the removal of existing vegetation; the removal from site or the treatment of any contaminated material encountered during demolition; the levelling and profiling of site area (including significant re-profiling of the existing soil bunds); The construction of a new EfW plant; Proposed Extension, including; the main plant (with associated bunkers and tipping areas etc.), electrical substation, attenuation lagoon, district heating centre, construction laydown area, car parking and access roadways. Further details are listed below. October 2019 Report No. 4740/01 Issue 1 Page 1 of 31 Phase 1 Geo-Environmental Assessment Allington EfW Proposed Extension, Allington 1.2.2 A plan of the Proposed Extension is presented in Figure 1 below: N Figure 1: Plan of Proposed Extension as provided by the Client (not to scale) 1.2.3 Key features of the Proposed Extension include: Main plant area situated centrally on Figure 1 above (comprising of a turbine hall, a furnace hall, a waste bunker and ash bunker, waste processing, boilers plus an 80m vent stack; Attenuation Lagoon situated towards the northwest corner of the site; Access roadways running north to south adjacent the main plant area and towards the east from the southeast corner of the main plant area; Car parking space to the north of the main plant area on the northern boundary of the site; District Heating Centre directly to the northwest of the main plant area; Maintenance Contractors Compound situated directly to the north of the main plant area; and, Construction laydown area situated directly to the west of the main plant area and along the western site boundary. 1.2.4 The findings and conclusions of the risk assessments have been set out and recommendations given for the proposed industrial end use. If there is a subsequent October 2019 Report No. 4740/01 Issue 1 Page 2 of 31 Phase 1 Geo-Environmental Assessment Allington EfW Proposed Extension, Allington change in the proposed land the risk assessments and conclusions should be reviewed to determine whether they are still applicable for the revised end use. 1.3. Planning Status & Requirements 1.3.1 This Proposed Extension is to be undertaken via development consent order (DCO) which is exempt of planning control but still employs strict