Water and Environment Management Framework Lot 3 – Engineering and Related Services West Wight Coastal Flood and Erosion Risk Management Strategy Appendix B - Contaminated Land Review March 2016 Document overview Capita | AECOM was commissioned by the Isle of Wight Council in October 2014 to undertake a Coastal Flood and Erosion Risk Management Strategy. As part of this commission, a contaminated land review is required in order to determine the potential contamination issues that need to be considered as part of the strategy. Document history Version Status Issue date Prepared by Reviewed by Approved by Jason Drummond – Principal Flood and Coastal Tara-Leigh Helen Culshaw – Draft for Specialist McVey 1 6th February 2015 Senior comment Hydrogeologist George Batt – Associate Graduate Coastal Engineer Jason Drummond George Batt – Tara-Leigh Revision – 27th February Graduate McVey 2 after client Principal Flood 2015 Coastal comments and Coastal Engineer Associate Specialist Jason Drummond Revision George Batt – – Tara-Leigh after further Graduate Principal Flood McVey 3 4th August 2015 client Coastal and Coastal comments Engineer Specialist Associate Revision Ben Taylor – Tara-Leigh Jonathan Short – after further 18th December Graduate McVey 4 Senior Coastal client 2015 Coastal Specialist comments Engineer Associate Tara-Leigh Ben Taylor Jonathan Short – Update for McVey 5 March 2016 Assistant Principal consultation Consultant Consultant Associate Scott House, Alencon Link, i Basingstoke, Hampshire, RG21 7PP. Limitations Capita Property and Infrastructure Ltd (“Capita”) / Capita | AECOM URS Infrastructure & Environment UK Limited (“AECOM”) has prepared this Report for the sole use of the Isle of Wight Council in accordance with the Agreement under which our services were performed. No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by Capita | AECOM. This Report is confidential and may not be disclosed by the Client nor relied upon by any other party without the prior and express written agreement of Capita | AECOM. The conclusions and recommendations contained in this Report are based upon information provided by others and upon the assumption that all relevant information has been provided by those parties from whom it has been requested and that such information is accurate. Information obtained by Capita | AECOM has not been independently verified by Capita | AECOM, unless otherwise stated in the Report. The methodology adopted and the sources of information used by Capita | AECOM in providing its services are outlined in this Report. The work described in this Report was undertaken between December 2014 and January 2015 and is based on the conditions encountered and the information available during the said period of time. The scope of this Report and the services are accordingly factually limited by these circumstances. Where assessments of works or costs identified in this Report are made, such assessments are based upon the information available at the time and where appropriate are subject to further investigations or information which may become available. Capita | AECOM disclaim any undertaking or obligation to advise any person of any change in any matter affecting the Report, which may come or be brought to Capita’s | AECOM’s attention after the date of the Report. Certain statements made in the Report that are not historical facts may constitute estimates, projections or other forward-looking statements and even though they are based on reasonable assumptions as of the date of the Report, such forward-looking statements by their nature involve risks and uncertainties that could cause actual results to differ materially from the results predicted. Capita | AECOM specifically does not guarantee or warrant any estimate or projections contained in this Report. ii Contents 1. Introduction 1 1.1 Project Background 1 1.2 Purpose of the Document 1 2. Contaminated Land 2 2.1 Definition 2 2.2 Assessing Risk 3 3. Methodology 4 3.1 Data Collection and Review 4 3.2 Scoping Relevant Sites 4 3.3 Establishing Potential Receptors and Pathways 4 3.4 Risk Assessment of Relevant Sites 4 4. Data Review 6 4.1 Source Data 6 4.2 Receptor Data 6 4.3 Pathway Data 6 5. Potential Contamination Receptors 7 5.1 Human Beings and Property 7 5.2 Ecological Systems 7 5.3 Controlled Waters 8 6. Potential Contamination Pathways 10 6.1 General Pathways 10 6.2 Strategy Impacts on Source-Receptor Linkages 11 7. Risk Assessment of Contamination Sites 12 7.1 Context 12 7.2 Sites 12 8. Conclusions 27 8.1 Summary 27 8.2 Recommendations for Strategy Development and Implementation 27 9. References 28 Figures Figure 2-1: Risk Model (adapted from CIRIA C718) 3 Tables Table 5-1: Environmentally Designated Sites within the Strategy 7 iii 1. Introduction 1.1 Project Background Capita | AECOM has been appointed by the Isle of Wight Council (IWC) to develop a coastal flood and erosion risk management strategy for West Wight, between Freshwater Bay westward along the coast to East Cowes. The strategy will evaluate options for managing coastal flooding and erosion, including potential maintenance and capital works required. The strategy option assessments will be based on technical issues, economics, stakeholder interests, and environmental impacts. Following a thorough evaluation of these different aspects, the strategy will develop sustainable and adaptable coastal defence options with preferred implementation plans put forward. These options will reference the preferred policies outlined in the Isle of Wight Shoreline Management Plan 2 (SMP2) published in 2010. The SMP2 was adopted by the Isle of Wight Council and the Regional Flood Defence Committee in December 2010; formal Environment Agency approval followed in May 2011. 1.2 Purpose of the Document This document details the findings of a land contamination data desktop study undertaken by Capita | AECOM for the West Wight strategy area; the available data has been reviewed to identify contaminated land that will need to be considered in the West Wight Coastal Flood and Erosion Risk Management Strategy, herein referred to as “the Strategy”. Contaminated land needs to be addressed in the Strategy because there is potential for the strategy management decisions to have either a positive or negative influence on issues regarding contamination. For example, the implementation of new defences along a currently eroding contaminated shoreline can remove a pollution hazard by blocking the pathway that in the future would link a source (e.g. a landfill site) to a receptor (e.g. an environmentally sensitive habitat). Conversely, following a policy of ‘No Active Intervention’ may allow a contamination issue caused by flooding or erosion to continue or to be introduced. These issues must therefore be recognised and risks assessed to develop potential options. No intrusive surveys or material testing has been carried out as part of the assessment. The desktop study has been based on a review of available data and information provided by IWC and/or held in the public domain. The indicative risk levels attributed to sites are provided purely in relation to the Strategy for the purpose of highlighting key issues for option development, and should not be used in any other context. It should also be noted that although certain sites along the frontage have been identified as being potentially contaminated, no sites have been formally designated as ‘Contaminated Land’ at present. Further detailed studies and intrusive surveys would be required to confirm if these potentially contaminated sites would meet the statutory definition of contaminated land. Due to the indicative and strategic level nature of the desktop findings, and due to potential sensitivities or misinterpretation of sensitive information, no mapping of sites has been undertaken; rather potential sites have been signposted in each Policy Unit (Section 7) and this information has been considered in the appraisal of Strategy options. 1 2. Contaminated Land 2.1 Definition Contaminated land is defined in section 78A(2) of Part 2A of Environmental Protection Act 1990. With the issue of the new Statutory Guidance (2012) the definition has been modified to include the significant pollution of controlled waters: “Any land which appears to the local authority in whose area it is situated to be in such a condition, by reason of substances in, on or under the land, that: Significant harm is being caused or there is a significant possibility of such harm being caused; or Significant pollution of controlled waters is being caused, or there is a significant possibility of such pollution being caused.” Contamination of land arises primarily from industrial processes, accidents or spills of contaminants, waste disposal and leaking underground storage tanks. If not dealt with adequately it can pose a threat to human health, the environment and sustainable economic development. In this context, the Government’s objectives with respect to contaminated land are: To identify and remove unacceptable risks to human health and the environment; To seek to ensure that contaminated land is made suitable for its current use; To ensure that the burdens faced by individuals, companies and society as a whole are proportionate, manageable and compatible with the principles of sustainable development. The risks presented by any given level of contamination will vary greatly according to the use of the land and a wide range of other factors, such as the underlying geology of the site. In recognition of this, the Government considers a ‘suitable for use’ approach in dealing with contaminated land to be the most appropriate. This consists of four elements and is the basis of the current UK legislation dealing with contaminated land: Ensuring that the land is suitable for its current use; Ensuring that land is made suitable for any new use, as official permission is given for that new use; Limiting requirements for remediation work in relation to the current use; Future use of the land.