Environmental Impact Assessment – Appendix 7.2 Contaminated Land Risk Assessment 163390-JAC-REP-EEN-070002 Revision A01
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OFFICIAL Network Rail Oxford Corridor Phase 2 Capacity Improvement Scheme Environmental Impact Assessment – Appendix 7.2 Contaminated Land Risk Assessment 163390-JAC-REP-EEN-070002 Revision A01 Town and Country Planning (Environmental Impact Assessment) Regulations 2017 Network Rail Oxford Corridor Phase 2 Capacity Improvement Scheme Environmental Impact Assessment – Appendix 7.2: Preliminary Risk Assessment Document Reference 163390-JAC-REP-EEN-070002 Author Jacobs Date June 2021 Revision Number A01 OFFICIAL Network Rail Oxford Corridor Phase 2 Capacity Improvement Scheme Environmental Impact Assessment – Appendix 7.2 Contaminated Land Risk Assessment 163390-JAC-REP-EEN-070002 Revision A01 Environmental Impact Assessment – Appendix 7.2: Contaminated Land Risk Assessment Document Version Control Version Date Author Reviewer Approver A01 Jun 2021 J. Thompson & M. Williams A. Naik F. Giacomello Report for: Authored by: Network Rail Jacobs SN1 1180 Eskdale Rd Station Road Winnersh Swindon Reading SN11DG RG41 5TU © Copyright 2021 . The concepts and information contained in this document are the property of Network Rail. Use or copying of this document in whole or in part without the written permission of constitutes an infringement of copyright. Limitation: This document has been prepared on behalf of Network Rail, and for the exclusive use of Network Rail, and is subject to, and issued in accordance with, the provisions of the contract between Jacobs and the Network Rail. Jacobs accepts no liability or responsibility whatsoever for, or in respect of, any use of, or reliance upon, this document by any third party. OFFICIAL Network Rail Oxford Corridor Phase 2 Capacity Improvement Scheme Environmental Impact Assessment – Appendix 7.2 Contaminated Land Risk Assessment 163390-JAC-REP-EEN-070002 Revision A01 Contents 1. INTRODUCTION ................................................................................................. 1 2. HISTORICAL REPORTS .................................................................................... 2 2.2 Oxford Corridor Capacity Improvement Phase 1 and Phase 2 Ground Investigation Report, September 2014. ....................................................... 3 2.3 Contaminated Land Risk Assessment October 2014 ................................... 7 2.4 Geo-environmental Summary Memorandum, 2014 ...................................... 8 2.5 Oxford Corridor, Down Sidings Contaminated Land Study Report, April 2018 .................................................................................................................... 9 2.6 Oxford Corridor, Phase 2, Detailed Design Environment Management Plan, GRIP Stage 5 ............................................................................................ 12 3. CONCEPTUAL MODEL .................................................................................... 13 3.1 Legislative Background and Assessment of Risk ....................................... 13 3.2 Conceptual Model ...................................................................................... 15 3.3 Preliminary Risk Assessment ..................................................................... 16 3.4 Conclusions ................................................................................................ 24 REFERENCES ......................................................................................................... 26 i OFFICIAL Network Rail Oxford Corridor Phase 2 Capacity Improvement Scheme Environmental Impact Assessment – Appendix 7.2 Contaminated Land Risk Assessment 163390-JAC-REP-EEN-070002 Revision A01 Tables Table A2.1: Historical reports ................................................................................................... 2 Table A2.2: Groundwater strikes .............................................................................................. 5 Table A2.3: Summary of boreholes from Roger Dudman Way investigation ........................... 9 Table A3.1: Classification of consequence (based on CIRIA, 2001) ...................................... 13 Table A3.2: Estimation of likelihood ....................................................................................... 14 Table A3.3: Risk matrix – Risk ratings ................................................................................... 14 Table A3.4: Risk descriptions ................................................................................................. 15 Table A3.5: Potential sources of contamination ..................................................................... 15 Table A3.6: Potential pathways .............................................................................................. 16 Table A3.7: Conceptual model and risk assessment - Sheepwash Bridge replacement ....... 18 Table A3.8: Conceptual model and risk assessment - Roger Dudman Way, western entrance, Platform 5 ............................................................................................................... 19 Table A3.9: Conceptual model and risk assessment - Platform 5 and subway ..................... 20 Table A3.10: Conceptual model and risk assessment - Botley Road Bridge widening .......... 21 Table A3.11: Conceptual model and risk assessment - Becket Street station car park and temporary Co-operative Childcare ......................................................................................... 22 ii OFFICIAL Network Rail Oxford Corridor Phase 2 Capacity Improvement Scheme Environmental Impact Assessment – Appendix 7.2 Contaminated Land Risk Assessment 163390-JAC-REP-EEN-070002 Revision A01 1. INTRODUCTION 1.1.1 This Contaminated Land Risk Assessment takes into account geology and soils baseline data, potential sources of contamination identified in the review of current and historical land uses and previous ground investigations results. This information is used to create a conceptual model and risk assessment. 1.1.2 A review has been undertaken of historical reports from the previous stages of the Oxford Corridor Phase 2 Scheme. 1.1.3 The reports’ content and relevance to Chapter 7 Geology and Soils in Volume 2 of the Environmental Statement have been reviewed (e.g. ground investigations data, chemical analysis, groundwater, and ground gas monitoring). These reports are not presented in their entirety within the Environmental Statement. Rather a summary of the findings of each of the reports is given within this appendix. The reports themselves can be made available upon request if required. Contamination noted from these reports is included in the Conceptual Model and Risk Assessment within this appendix. Page 1 of 26 OFFICIAL Network Rail Oxford Corridor Phase 2 Capacity Improvement Scheme Environmental Impact Assessment – Appendix 7.2 Contaminated Land Risk Assessment 163390-JAC-REP-EEN-070002 Revision A01 2. HISTORICAL REPORTS 2.1.1 The historical reports in Table A2.1 have been prepared by Halcrow – Tata Joint Venture (THJV). They are reviewed and summarised within this appendix. Table A2.1: Historical reports Year Title September Oxford Corridor Capacity Improvement Phase 1 and Phase 2 Ground 2014 investigation Report * October 2014 Oxford Corridor Capacity Geo-Environmental Summary Memorandum October 2014 Oxford Corridor Capacity Improvement - Contaminated Land Risk Assessment June 2017 Oxford Corridor Roger Dudman Way Factual Ground Investigation Report April 2018 Oxford Corridor Down Sidings Contaminated Land Study Report November Oxford Corridor Phase 1 Design Environmental Management Plan 2020 * This report includes previous ground investigations by: MLM, Bridgeway Consulting, THJV and Global Rail Consulting 2.1.2 A summary of the contamination identified in previous ground investigation reports from Table A2.1 and potential sources of contamination identified within the study area are bulleted below: • Made ground found across the site in the historical ground investigations including asbestos where tested (within red line boundary); • Hydrocarbon contamination found in groundwater sampled from a borehole at Osney Lane footbridge (location shown in Figure 7.2) (outside red line boundary); • Historical land uses including sidings and depots at Roger Dudman Way car park (outside red line boundary); • Former diesel tanks located within the Down Carriage Sidings associated with historical hydrocarbon contamination (outside red line boundary); • Diesel spill at Castel Mill redevelopment site (outside red line boundary); • Three historical landfills (outside red line boundary); and • Historical industrial land use including Tallow Factory, Eagle Foundry (Iron and Brass) and Ink Works (outside red line boundary). Page 2 of 26 OFFICIAL Network Rail Oxford Corridor Phase 2 Capacity Improvement Scheme Environmental Impact Assessment – Appendix 7.2 Contaminated Land Risk Assessment 163390-JAC-REP-EEN-070002 Revision A01 2.2 Oxford Corridor Capacity Improvement Phase 1 and Phase 2 Ground Investigation Report, September 2014. 2.2.1 THJV was commissioned by Network Rail to undertake a ground investigation to provide the required ground information to complete the Oxford Corridor Capacity Improvement Scheme design to Approval in Principal (THJV, 2014a). 2.2.2 The area covered in this report is much larger than the current study area. In the current review focuses on the information provided within the geology and soils study area as defined in Chapter 7 within Volume 2 of the Environmental Statement. 2.2.3 A map of the boreholes is provided in Appendix H of the 2014