Chapter 7 Marine Water and Sediment Quality · 2020-03-02 · Project related 31 January 2020 PB4749-RHD-ZZ-XX-RP-Z-0007 1 7 Marine Water and Sediment Quality 7.1 Introduction 1

REPORT

Millport Coastal Flood Protection

Scheme: Environmental Statement

Chapter 7 Marine Water and Sediment Quality

Client: North Ayrshire Council

Reference: PB4749-RHD-ZZ-XX-RP-Z-0007

Status: Final/P01.01

Date: 31 January 2020

P r o j e c t r e l a t e d

31 January 2020 PB4749-RHD-ZZ-XX-RP-Z-0007

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Document title: Millport Coastal Flood Protection Scheme: Environmental Statement

Document short title:

Reference: PB4749-RHD-ZZ-XX-RP-Z-0007

Status: P01.01/Final


Project name: Millport Coastal Flood Protection Scheme

Project number: PB4749

Author(s): Sarah Marjoram

Drafted by: Sarah Marjoram

Checked by: Christa Page

Date / initials: 14/11/2019

Approved by: Frank Fortune

Date / initials: 09/01/2020

Classification

Project related

Disclaimer

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Table of Contents

7 Marine Water and Sediment Quality 1

7.1 Introduction 1

7.2 Policy, Legislation and Guidance 1

7.3 Consultation 7

7.4 Methodology 8

7.5 Existing Environment 13

7.6 Embedded Mitigation 16

7.7 Potential Impacts during Construction 17

7.8 Potential Impacts during Operation 19

7.9 Potential Impacts during Decommissioning 20

7.10 Cumulative Impact Assessment 21

7.11 Inter-relationships 21

7.12 Interactions 22

7.13 Summary 23

7.14 References 24

Table of Tables

Table 7-1 Summary of key international legislation and policy relevant to this proposed scheme 2

Table 7-2 Summary of key national legislation and policy relevant to this proposed scheme 2

Table 7-3 Relevant local planning policies 7

Table 7-4 Consultation responses 8

Table 7-5 Definitions of Sensitivity Levels for a Receptor 10

Table 7-6 Definitions of magnitude levels 11

Table 7-7 Impact significance matrix 12

Table 7-8 Impact significance definitions 12

Table 7-9 2017 Classification status of Largs Channel (Fairlie Roads) coastal water body 14

Table 7-10 Potential construction impacts 17

Table 7-11 Potential operational impacts 20

Table 7-12 Inter-topic relationships 22

Table 7-13 Potential interaction between impacts 22

Table 7-14 Potential Impacts Identified for marine water and sediment quality 23



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Table of Figures

Figure 7-1 Location of WFD water bodies and Bathing Waters

Figure 7-2 Location of vibrocore samples

Appendices

Appendix 7.1 Pre-Disposal Sampling Results Form



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Acronyms

Acronym Acronym description

CCME Canadian Council of Ministers of the Environment

CEMP Construction Environment Management Plan

CIA Cumulative Impact Assessment

DAERA Department of Agriculture, the Environment and Rural Affairs

EA Environment Agency

EIA Environmental Impact Assessment

EQS Environmental Quality Standards

ES Environmental Statement

FSA Food Standards Agency

GPP Guidance for Pollution Prevention

HMWB Heavily Modified Water Body

ISQG Interim Sediment Quality Guidelines

MS Marine Scotland

NIEA Northern Ireland Environment Agency

NRW Natural Resources Wales

PAH Polyaromatic Hydrocarbons

PEL Predicted Effects Level

PPG Pollution Prevention Guidelines

PSA Particle Size Analysis

RBMP River Basin Management Plan

SEPA Scottish Environmental Protection Agency

TEL Threshold Effects Level

WFD Water Framework Directive

WID Water Injection Dredging



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Glossary

Glossary Term Glossary Text

Environmental

Impact Assessment

(EIA)

A statutory process by which certain planned projects must be assessed before a

formal decision to proceed can be made. It involves the collection and

consideration of environmental information, which fulfils the assessment

requirements of the EIA Directive and EIA Regulations, including the publication

of an Environmental Statement.

Environmental

Statement (ES)

A document reporting the findings of the EIA and produced in accordance with the

EIA Directive as transposed into UK law by the EIA Regulations.

Millport Coastal

Flood Protection

Scheme

The scheme consists of offshore rock armour structures which will be built in the

vicinity of the rock islets within Millport Bay. Onshore works will include flood

walls, improvement works to existing coast protection structures, and works to

raise the level of existing grass areas. Works on the foreshore include shore-

connected rock armour breakwaters and rock armour revetments.



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7 Marine Water and Sediment Quality

7.1 Introduction

1. This chapter of the Environmental Statement (ES) considers the potential impacts of the proposed

Millport Coastal Flood Protection Scheme (the proposed scheme) on marine water and sediment

quality.

2. This chapter provides a summary description of key aspects relating to existing marine water and

sediment quality followed by an assessment of the magnitude and significance of the effects upon

the baseline conditions resulting from the construction, operation and decommissioning of the

proposed scheme as well as those effects resulting from cumulative interactions with other existing

or planned projects. The potential effects on marine water and sediment quality are assessed

conservatively using realistic worst-case scenarios for the proposed scheme.

3. All figures referred to in this chapter are provided in Volume II of this ES.

4. The assessment of potential effects has been made with specific reference to Scotland’s National

Planning Framework and Planning Policy . These are discussed further in Chapter 2 Policy and

Legislation and outlined below in Section 7.2. These are the principal decision-making documents

for flood protection schemes.

5. This chapter has been prepared by Royal HaskoningDHV in accordance with the relevant legislation

and policies, adhering to the methodology for Environmental Impact Assessment (EIA) and

Cumulative Impact Assessment (CIA) as discussed in Section 7.4.

6. As the movement of water and sediment within the marine environment is intrinsically linked with

physical processes, this chapter should be read in conjunction with Chapter 6 Marine Geology,

Oceanography and Physical Processes.

7. Information on the chemical analysis undertaken on sediments to support the assessment of impacts

on marine water and sediment quality is provided separately in Appendix 7.1 Pre-Disposal

Sampling Results Form (Volume III).

7.2 Policy, Legislation and Guidance

8. There are a number of pieces of legislation applicable to marine water and sediment quality which

are relevant to this chapter. Further details are provided in Chapter 2 Policy and Legislation.

9. The policies and plans outlined throughout this section have also been reviewed for their relevance

to marine water and sediment quality when undertaking the EIA for the proposed scheme.

7.2.1 International Legislation and Policy

10. Table 7-1 below provides a brief summary of the key international legislation and policy relevant to

the scheme.



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Table 7-1 Summary of key international legislation and policy relevant to this proposed scheme

Legislation Relevance

Water Framework Directive

(WFD) (2000/60/EC)

Council Directive 2000/60/EC establishing a framework for community action in the

field of water policy. requires that all European Union (EU) Member States must

prevent deterioration and protect and enhance the status of aquatic ecosystems.

This means that EU Member States must ensure that new schemes do not

adversely impact upon the status of aquatic ecosystems, and that historical

modifications that are already impacting it need to be addressed.

Bathing Water Directive

(2006/7/EC)

This Directive requires Member States to monitor and assess bathing waters and

inform the public about bathing water quality and beach management through

bathing water profiles. Bathing Waters are Protected Areas under the WFD.

Marine Strategy Framework

Directive (MSFD) (2008/56/EC)

The MSFD establishes a framework for community action in the field of marine

environmental policy and aims to achieve Good Environmental Status (GES) of the

EU's marine waters by 2020 and to protect the resource base upon which marine-

related economic and social activities depend. In order to achieve GES by 2020,

each Member State is required to develop a strategy for its marine waters (or

Marine Strategy).

The International Convention for

the Prevention of Marine

Pollution by Ships 73/78

(MARPOL)

The International Convention for the Prevention of Pollution from Ships (MARPOL),

to which the UK is a signatory, seeks to prevent and minimise marine pollution from

ships arising from operational and accidental events.

7.2.2 National Legislation and Policy

7.2.2.1 National Legislation

11. Table 7-2 below provides a brief summary of the key national legislation and policy relevant to the

scheme.

Table 7-2 Summary of key national legislation and policy relevant to this proposed scheme


Marine and Coastal Access Act

2009

The Act provides executive devolution to Scottish Ministers of the new marine

planning and conservation powers in the offshore region (12-200 nautical miles),

coinciding with the existing executive devolution of marine licensing. The Marine

(Scotland) Act 2010 provides the legislation for marine planning, licensing and

conservation activities in the inshore region.

Marine (Scotland) Act 2010

The act defines the requirement for marine licences in Scottish waters which

includes the “construction of any works in or over the sea, and on or under the

seabed” and the carrying “out of any form of dredging within the Scottish marine

area (whether or not involving the removal of any material from the sea or sea

bed)”. The application for a licence must have regard to the need to protect the

environment, protect human health, prevent interference with legitimate uses of the

sea and other matters considered relevant by Scottish Ministers.

Marine Policy Statement (2011)

The Marine Policy Statement (MPS) is the framework for preparing Marine Plans

and taking decisions affecting the marine environment. It will contribute to the

achievement of sustainable development in the United Kingdom marine area,

ensuring that marine resources are used in a sustainable way in line with the high

level marine objectives.



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Water Environment and Water

Services (Scotland) Act 2003

(WEWS Act)

This arose from the Water Framework Directive 2000/60/EC becoming law in

Scotland. It commits Scotland to achieve good qualitative and quantitative status of

all water bodies by 2015 with the final deadline for meeting objectives being 2027.

River basins comprise all transitional waters (estuaries) and coastal waters

extending to 3 nautical miles (nm) seaward from the territorial baseline. Any

proposed development within 3nm must have regard to the requirements of the

WFD to ensure that all transitional and coastal water bodies achieve ‘Good

Ecological Status’ and that there is no deterioration in status.

Water Environment (Controlled

Activities) (Scotland) Regulations

2011 (as amended)

The Controlled Activities Regulations 2011 (CARs) (and it’s amendments in 2013

and 2017) apply regulatory controls over activities which may affect Scotland’s

water environment. The regulations cover rivers, lochs, transitional waters

(estuaries), coastal waters, groundwater and groundwater dependent wetlands.

The Marine Strategy Regulations

2010

The MSFD 2008 (Directive 2008/56/EC) was transposed into UK law in 2010

through the Marine Strategy Regulations 2010. This establishes a framework for

community action in the field of marine environmental policy and aims to achieve

Good Environmental Status (GES) in UK marine waters by 2020.

Water Environment (Shellfish

Water Protected Areas:

Environmental Objectives etc.)

(Scotland) Regulations 2013

The Shellfish Waters Directive was repealed in 2013 and was replaced by this

legislation in 2013. The objectives of this regulation are to prevent the deterioration

of water quality within a shellfish water protected area and protect and improve

each protected area to achieve good water quality by 2015. In order to help

achieve this these regulations also put in place a monitoring and measures

programmes for each shellfish water.

Bathing Waters (Scotland)

Amendment Regulations 2012

Previously designated under the Bathing Water Directive (76/160/EEC), these

waters are now covered by the revised Bathing Water Directive (2006/7/EC) which

are transposed into Scottish law through the Bathing Waters (Scotland) Amendment

Regulations 2012

MARPOL Convention

The MARPOL Convention is the main international convention covering prevention

of pollution of the marine environment by ships from operational or accidental

causes. It is a combination of two treaties adopted in 1973 and 1978 respectively

and updated by amendments through the years. The Convention covers all the

technical aspects of pollution from ships, except the disposal of waste into the sea

by dumping, and applies to ships of all types, although it does not apply to pollution

arising out of the exploration and exploitation of sea-bed mineral resources.

Marine Scotland Action Levels for

the disposal of dredged material

Marine Scotland guideline Action Levels for the disposal of dredged material are not

statutory contaminant concentrations for dredged material but are used as part of a

weight of evidence approach to decision-making on the disposal of dredged

material to sea. These values are used in conjunction with a range of other

assessment methods as well as historical data and knowledge regarding the

dredging site, the material's physical characteristics, the disposal site characteristics

and other relevant data, to make management decisions regarding the fate of

dredged material.

The Action Levels are therefore not ‘pass/fail’ criteria but triggers for further

assessment. In general, contaminant levels in dredged material below Action Level

1 are of no concern and are unlikely to influence the licensing decision. However,

dredged material with contaminant levels above Action Level 2 is generally

considered unsuitable for sea disposal. Dredged material with contaminant levels

between Action Levels 1 and 2 requires further consideration and testing before a

decision can be made.



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7.2.2.2 National Planning Policy

National Planning Framework

12. Scotland’s Third National Planning Framework (NPF) (Scottish Government, 2014a) includes the

following ambitions relevant to the marine environment at Millport, and these have been considered

when undertaking the EIA for the proposed scheme:

13. Para 4.10: “The 2020 Challenge for Scotland’s Biodiversity aims to promote and enhance

Scotland’s nature, and to better connect people with the natural world. Maintaining our natural

capacity to provide services makes economic sense – to help achieve this, biodiversity in Scotland

needs to be viewed at a landscape scale;”

14. And:

15. Para 4.29: “The environment of our coastal areas, on land and at sea, is an outstanding,

internationally important resource. These natural assets support quality of life and underpin important

economic sectors like tourism, outdoor recreation and food and drink.”

16. Para 4.30: “The marine environment, and its natural resources, are central to this. National

and Regional Marine Plans will provide policies to achieve sustainable development, protection and,

where appropriate, enhancement of the marine area. Onshore, land management practices, including

crofting in the north and west and on the islands, help to sustain unique cultural and natural

environments.”

17. Para 4.31: “As climate change impacts on Scotland’s coastline, there will be a need to address

the long-term resilience of some island and coastal communities.”

Scottish Planning Policy

18. Scotland’s Planning Policy (SPP) (Scottish Government, 2014b) contains the following Policy

Principles with regards to Valuing the Natural Environment and these have been taken into

consideration when undertaking the EIA for the proposed scheme:

19. “The planning system should:

• Facilitate positive change while maintaining and enhancing distinctive landscape character;

• Conserve and enhance protected sites and species, taking account of the need to maintain

healthy ecosystems and work with the natural processes which provide important services to

communities;

• Promote protection and improvement of the water environment, including rivers, lochs,

estuaries, wetlands, coastal waters and groundwater, in a sustainable and co-ordinated way;

• Seek benefits for biodiversity from new development where possible, including the restoration

of degraded habitats and the avoidance of further fragmentation or isolation of habitats; and

• Support opportunities for enjoying and learning about the natural environment.

• The planning system should support an integrated approach to coastal planning to ensure that

development plans and regional marine plans are complementary.

Planning Advice Notes (PANS)

20. Planning Advice Note (PAN) 1/2013: Environmental Impact Assessment explains the role of individual

planning authorities and that of the Consultation Bodies in EIA, as well as providing guidance on the

ways in which EIA can be integrated into the overall development management process.



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21. PAN 60: Planning for Natural Heritage provides advice on how development and the planning system

can contribute to the conservation, enhancement, enjoyment and understanding of Scotland's natural

environment and encourages developers and planning authorities to be positive and creative in

addressing natural heritage issues. It complements the National Planning Policy Guideline on Natural

Heritage (NPPG 14), with examples of good planning practice in relation to natural heritage drawn

from across Scotland highlighted in a number of case studies.

National Planning Policy Guidelines (NPPG)

22. National Planning Policy Guideline (NPPG) 14: Natural Heritage gives guidance on how the

Government's policies for the conservation and enhancement of Scotland's natural heritage should

be reflected in land use planning. In this context, Scotland's natural heritage includes its plants and

animals, its landforms and geology, and its natural beauty and amenity. Natural heritage embraces

the combination and interrelationship of landform, habitat, wildlife and landscape and their capacity

to provide enjoyment and inspiration. It therefore encompasses both physical attributes and aesthetic

values and, given the long interaction between human communities and the land in Scotland, has

important cultural and economic dimensions.

Scotland’s National Marine Plan: A Single Framework for Managing Our Seas

23. This Plan covers both Scottish inshore waters (out to 12 nautical miles) and offshore waters (12 to

200 nautical miles). It also applies to the exercise of both reserved and devolved functions. Under

devolution, the Scottish Parliament can legislate in relation to activities affecting the marine

environment in Scotland’s inshore waters, except for reserved matters. The UK Parliament legislates

for Scotland’s offshore waters, but certain matters in this area have been executively devolved.

Marine planning matters in Scotland’s inshore waters are governed by the Marine (Scotland) Act

2010, an Act of the Scottish Parliament, and in its offshore waters by the Marine and Coastal Access

Act 2009, an Act of the UK Parliament.

24. The two Acts (referred to as the Marine Acts) established a new legislative and management

framework for the marine environment allowing the competing demands on the sea to be managed

in a sustainable way across all of Scotland’s seas. Under the Marine (Scotland) Act 2010 Scottish

Ministers must prepare and adopt a National Marine Plan covering Scottish inshore waters. In

addition, the Marine and Coastal Access Act 2009 required Scottish Ministers to ensure that a marine

plan was in place in the offshore region for when the Marine Policy Statement came into effect (in

2011).

7.2.3 Regional Legislation and Policy

7.2.3.1 Clyde Regional Marine Plan

25. The Marine (Scotland) Act allowed for the creation of 11 Scottish Marine Regions by the Scottish

Marine Regions Order 2015. The boundaries of these extend from MHWS out to 12 nm and up to

the Normal Tidal Limit of rivers within the region. The Act also allows for the development of regional

marine planning partnerships, of which Clyde and Shetland Isles are the first to be developed.

26. The Clyde Regional Marine Plan is being produced by the Clyde Marine Planning Partnership who

were given the powers to do so by Ministerial Direction in 2017. Pre-consultation on the draft Clyde

Regional Marine Plan took place between 18th March and 27th May 2019. This pre-consultation draft

is based on the Clyde Marine Region Assessment (2017) which provided a comprehensive review of

environmental, social and economic trends and issues in the Clyde Marine Region. The draft Plan

will be reviewed and updated following comments received and submitted for statutory consultation.



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The final version of the Clyde Regional Marine Plan is planned to be published in Q2/Q3 of 2020

following Scottish Ministerial approval.

27. The Plan will create a framework for integrated, sustainable and co-ordinated planning and

management of the Clyde Marine Region’s environmental, economic and community resource.

7.2.4 Local Planning Policy

28. The proposed scheme falls within the North Ayrshire Council local authority boundary.

7.2.4.1 North Ayrshire Local Development Plan

29. North Ayrshire Council have adopted a new Local Development Plan (LDP) for North Ayrshire on

28th November 2019 (North Ayrshire Council, 2019), the LDP covers a 20 year period. For the

purpose of the Local Plan, Millport and the footprint of the proposed scheme is categorised to be

within ‘Developed Coast’.

30. Within this LDP, the Millport Conservation Area Regeneration Scheme (CARS) and the Flood

Defence Scheme is listed as Strategic Development Area 3 for Millport, Cumbrae.

7.2.4.2 Ayrshire Joint Structure Plan

31. The Ayrshire Joint Structure Plan ‘Growing A Sustainable Ayrshire’ (North Ayrshire Council, East

Ayrshire Council and South Ayrshire Council, 2007) establishes a framework that brings together the

aspirations of communities with those of business and industry, and the area’s many supporting

agencies and organisations, to provide a strategic land use context to the year 2025.

7.2.4.3 Ayrshire Shoreline Management Plan 2018

32. The Ayrshire Shoreline Management Plan was development by the North and South Ayrshire

Councils and adopted in 2018. Millport is contained within Sub-Cell: Great Cumbrae. The Action

Plan for this sub cell contains actions for the maintenance of existing defences, the Millport Flood

Defence Scheme, Coastal flooding feasibility study and an action on coastal flood protection for

roads.

33. Table 7-2Table 7-3 provides details of the local planning policy documents and the relevant policies

in respect to marine water and sediment quality. These policy document have been considered when

undertaking the EIA for the proposed scheme.



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Table 7-3 Relevant local planning policies

Document Policy /

Guidance Policy / Guidance purpose ES Reference

Adopted Local

Development Plan

(North Ayrshire

Council, 2019)

Policy 22

Water Environment Quality:

Developments will be supported that help achieve

the objectives of the WFD and the River Basin

Management Plan for Scotland. The development

will be required to ensure no unacceptable adverse

impact on the water environment by:

Protecting and enhancing the ecological status …,

natural heritage, landscape values and physical

characteristics of water bodies (including biodiversity

and geodiversity);

… protecting opportunities for public access to and

recreation and enjoyment on and around … the

coastal marine area; and

Having regard to any designated Bathing Waters.

Section 7.5

Policy 24

Alignment with Marine Planning

1: Within the developed coast:

All marine proposals should identify environmental

impacts and mitigate against these to ensure there

are not any unacceptable adverse impacts.

Developments on coastal areas with significant

constraints will be supported, in principle, only where

they would also contribute to the economic

regeneration or well-being of communities whose

livelihood is dependent on marine or coastal

activities.

Sections 7.7

and 7.8

Ayrshire Joint

Structure Plan

(2014)

ENV 9 Water

Framework

Directive

The three Ayrshire councils shall work with other

agencies to introduce the Water Framework Directive

into Planning Policy.

Section 7.5.2

ENV 10

Integrated

Coastal Zone

Management

North and South Ayrshire Councils shall bring

forward proposals for a coastal zone management

plan for the Ayrshire coastline.

Chapter 18

Water

Resources and

Flood Risk

7.3 Consultation

34. To inform the ES, North Ayrshire Council has undertaken a thorough pre-application consultation

process, which has included the following key stages:

• Scoping Reports submitted to Marine Scotland and North Ayrshire Council (Royal HaskoningDHV

2017); and

• Scoping Opinion received from Marine Scotland and North Ayrshire Council (2017).



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35. Full details of the proposed scheme consultation process to date is presented within Chapter 3 EIA

Methodology and Consultation.

36. A summary of the consultation carried out at key stages throughout the proposed scheme, of

particular relevance to marine water and sediment quality, is presented in Table 7-4.

Table 7-4 Consultation responses

Consultee Date/

Document Comment

Response / Where

addressed in the ES

SEPA

19/05/2017 /

Scoping

Report

Engineering works proposed are unlikely to require

CAR consent based on current design. Noted

Comply with PPG [Pollution Prevention Guidelines]

Notes during construction Section 7.4.1 and 7.7.1.

Do not agree that disturbed sediments are unlikely

to be an issue as there could be a risk if foreshore

works and/or dredging are done during the bathing

season (summer months). If works are to be

undertaken during the bathing waters season the

ES should address this.

Dredging works are

programmed to take place in

February 2022, outside the

Bathing Water season

(Section 7.6 and 7.7.1)

Welcome the consideration of impacts of existing

infrastructure on the environment and expect that

the ES will include information to confirm that there

will be no disruption to the sewerage system during

the bathing water season.

Addressed in Chapter 18

Water Resources and Flood

Risk

7.4 Methodology

37. This section describes the methodology used to obtain baseline data, characterise the marine water

and sediment quality of the area and undertake the EIA.

7.4.1 Best Practice and Guidance

38. The impact assessment has been based upon the following guidance and standards:

• Institute for Environmental Management and Assessment (IEMA) EIA Guidance

• SEPA (2016) Standing Advice for Marine Scotland on Small Scale Marine Licence Consultations.

39. SEPA has produced a number of guidance documents and Guidance for Pollution Prevention (GPP)

documents (in collaboration with Natural Resources Wales (NRW) and the Northern Ireland

Environment Agency (NIEA)) in the field of water quality which are relevant to the project:

• Supporting Guidance WAT-SG-53 on Environmental Quality Standards and Standards for

Discharges to Surface Waters (SEPA, 2019);

• GPP5: Works and maintenance in or near water (NIEA, Department for Agriculture the Environment

and Rural Affairs (DAERA), SEPA and NRW, 2018);



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• Pollution Prevention Guidance (PPG) 6: Working at construction or demolition sites (Environment

Agency (EA), NIEA and SEPA, 2012);

• GPP21: Pollution incident response planning (NIEA, SEPA and NRW, 2017); and,

• GPP22: Dealing with spills (NIEA, DAERA, SEPA and NRW, 2018a).

40. PPG6 has not yet been superseded by an updated GPP document and in the absence of other

regulatory guidance this is still considered relevant to managing environmental responsibilities and

protection of the environment.

41. There is no specific legislation concerning marine sediment quality. There are however, non-statutory

guidelines and assessment criteria applicable to marine sediments and the following have been used

in this assessment:

• The revised Marine Scotland (MS) Action Levels for the disposal of dredged sediment; and,

• The Canadian Interim Sediment Quality Guidelines (ISQG)1.

7.4.2 Baseline Data and Study Area

7.4.2.1 Data Sources – Desk Study

42. This section describes the data sources used to inform the assessment of effects of the development

on water and sediment quality. Data were collated through desk-based studies and site-specific

survey work and analysis commissioned to inform this ES. Desk-based sources consulted include:

• SEPA’s website and tools including the Water Environment Hub - https://www.sepa.org.uk/data-

visualisation/water-environment-hub/

• Scotland’s Environment Web – Map - https://map.environment.gov.scot/sewebmap/

• Scotland Government website - https://www.gov.scot/policies/water/protected-waters/

7.4.2.1 Data Sources – Site Specific Surveys and Reports

43. A site-specific survey was undertaken between the 28th and 30th September 2019 during which

sediment samples were taken for chemical and physical analysis and sent to SOCOTEC. The

samples were tested for the standard suite of chemicals as specified by MS. The samples also

underwent Particle Size Analysis (PSA) to determine the physical composition of the sediment.

7.4.2.2 Summary of Study Areas

44. The primary study area comprises the footprint of the project, including the landside works, intertidal

works and subtidal works. Adjacent areas within 2km of Millport containing designated water bodies,

shellfish waters and/or bathing waters that may be indirectly impacted (as evaluated in the

hydrodynamic modelling studies) have also been included in this assessment.

1CCME Summary Table: http://st-ts.ccme.ca/en/index.html



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7.4.3 Impact Assessment Methodology

45. General methods for EIA are discussed in Chapter 3 EIA Methodology and Consultation. The

following sections describe the methodology used to assess the potential impacts of the proposed

scheme on marine water and sediment quality in more detail.

46. The approach to determining the significance of an impact follows a systematic process for all

impacts. This involves identifying, qualifying and, where possible, quantifying the sensitivity, value

and magnitude of all ecological receptors which have been scoped into this assessment. Using this

information, a significance of each potential impact has been determined. Each of these steps is set

out in the remainder of this section.

47. For the impacts on marine water and sediment quality a number of discrete receptors can be

identified. These include certain designated areas with ascribed inherent values, such as:

• Bathing Waters,

• Shellfish Waters and,

• Nature conservation sites.

7.4.3.1 Sensitivity

48. The sensitivity of a receptor (Table 7-5) is dependent upon its:

• Tolerance: the extent to which the receptor is adversely affected by an effect;

• Adaptability: the ability of the receptor to avoid adverse impacts that would otherwise arise from an

effect; and

• Recoverability: a measure of a receptor’s ability to return to a state at, or close to, that which existed

before the effect caused a change.

49. The sensitivity is assessed using expert judgement and described with a standard semantic scale.

Definitions for each term are provided in Table 7-5. Expert judgements regarding receptor sensitivity

is closely guided by the conceptual understanding of baseline conditions.

Table 7-5 Definitions of Sensitivity Levels for a Receptor

Sensitivity Definition

High

The water quality of the receptor supports or contributes towards the designation of an

internationally or nationally important feature and/or has a very low capacity to accommodate any

change to current water quality status, compared to baseline conditions.

Medium The water quality of the receptor supports high biodiversity and/or has low capacity to

accommodate change to water quality status.

Low

The water quality of the receptor has a high capacity to accommodate change to water quality

status due, for example, to large relative size of the receiving water and capacity for dilution and

flushing. Background concentrations of certain parameters already exist.

Negligible Specific water quality conditions of the receptor are likely to be able to tolerate proposed change

with very little or no impact upon the baseline conditions detectable.



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50. The sensitivity criterion for water quality is a composite one; combining value (a measure of the

receptors importance, rarity and worth) with sensitivity. In some instances, the inherent value of a

receptor is recognised by means of designation (such as a bathing or shellfish water) and the ‘value’

element of the composite criterion recognises and gives weight in the assessment to that designation.

However, irrespective of the recognised value, all receptors will exhibit a greater or lesser degree of

sensitivity to the potential changes brought about by the proposed scheme.

7.4.3.2 Magnitude

51. The magnitude of the impact is assessed according to:

• The extent of the area subject to a predicted impact;

• The duration the impact is expected to last prior to recovery or replacement of the resource or

feature;

• Whether the impact is reversible, with recovery through natural or spontaneous regeneration, or

through the implementation of mitigation measures or irreversible, when no recovery is possible

within a reasonable timescale or there is no intention to reverse the impact; and

• The timing and frequency of the impact, i.e. conflicting with critical seasons or increasing impact

through repetition.

52. Where effects are anticipated to occur, their magnitude has been determined as per the criteria stated

in Table 7-6.

Table 7-6 Definitions of magnitude levels

Magnitude Definition

High Major change to one or more parameters of the baseline water and sediment physicochemical

characteristics.

Medium Noticeable change to one or more parameters of the baseline water and sediment physicochemical

characteristics.

Low Small or short-term change from the baseline water and sediment physico-chemical characteristics.

Negligible No detectable change to water and sediment physico-chemical characteristics or change is within

natural variation.

Duration

53. The definitions of duration used within this ES are dependent on the receptor, and how sensitive it is

to effects over different timescales. However, in general terms the following definitions have been

used:

• Short term: effects which typically occur over a matter of days or weeks, or less than one spring

tide cycle;

• Medium term: effects which occur over a full season such as one Bathing Water season (one

summer); and

• Long term: effects which occur over more than one year.



12

54. Where deviations from the definitions used within Section 7.4.3 occur, this is explained within the text.

7.4.3.3 Impact Significance

55. Following the identification of receptor importance and magnitude of the effect, it is possible to

determine the significance of the impact.

56. Impacts are unlikely to be significant where features of low importance are subject to small scale or

short-term effects. If an impact is found not to be significant at the level at which the resource or

feature has been valued, it may be significant at a more local level.

57. Following the identification of receptor importance and magnitude of effect, the significance of the

impact has been considered using the matrix presented in Table 7-7 below and knowledge of the

ecological features affected.

58. The assessment of potential impacts has been undertaken assuming implementation of embedded

mitigation and commitments for the proposed scheme. Residual impacts include any additional

mitigation measures required. An assessment of residual impacts is then made, after assuming

implementation of additional mitigation measures where required, i.e. the significance of the effects

that are predicted to remain after the implementation of all committed mitigation measures.

Table 7-7 Impact significance matrix

Negative Magnitude Beneficial Magnitude

High Medium Low Negligible Negligible Low Medium High

Sensitiv

ity

High Major Major Moderate Minor Minor Moderate Major Major

Medium Major Moderate Minor Minor Minor Minor Moderate Major

Low Moderate Minor Minor Negligible Negligible Minor Minor Moderate

Negligible Minor Minor Negligible Negligible Negligible Negligible Minor Minor

59. The impact significance categories are defined as shown in Table 7-8.

Table 7-8 Impact significance definitions

Impact

Significance Definition

Major

A significant downgrading of a designated water body status or sediment quality classification as a

result of a long-term inability to meet Environmental Quality Standards or changes to other

classification parameters.

Moderate

A downgrading of a designated water body status or sediment quality classification as a result of a

temporary inability to meet Environmental Quality Standards or short-term changes to other

classification parameters.

Minor One or more classification parameters change but this does not result in the modification of the

status of a designated water body or sediment quality classification.

Negligible Impact does not result in changes to any of the classification parameters that decide the status of

a designated water body or sediment quality classification.



13

60. Note that for the purposes of this ES, major and moderate impacts are deemed to be significant. In

addition, whilst minor impacts are not significant in their own right, it is important to distinguish these

from other non-significant impacts as they may contribute to significant impacts cumulatively or

through interactions.

61. Embedded mitigation has been referred to and included in the initial assessment of impact. If the

impact does not require mitigation (or none is possible) the residual impact remains the same.

However, if mitigation is required, an assessment of the post-mitigation residual impact is provided.

62. For the purposes of this ES, ‘major’ and ‘moderate’ impacts are deemed to be significant (in EIA

terms). In addition, whilst ‘minor’ impacts may not be significant, it is important to distinguish these

from other non-significant (negligible) impacts as they may contribute to significant impacts

cumulatively. Following initial assessment, if the impact does not require additional mitigation (or

none is possible) the residual impact will remain the same. If, however, additional mitigation is

proposed there will be an assessment of the post-mitigation residual impact.

7.4.3.4 Cumulative Impact Assessment

63. For an introduction to the methodology used for the Cumulative Impact Assessment (CIA), please

refer to Chapter 3 EIA Methodology and Consultation. This chapter includes those cumulative

impacts that are specific to marine water and sediment quality.

64. The CIA involves consideration of whether impacts on a receptor can occur on a cumulative basis

between the Project and other activities, projects and plans for which sufficient information regarding

location and scale exist.

65. The potential for cumulative effects has been considered for the construction, operation and

decommissioning of the proposed scheme cumulatively with other projects.

66. It is assumed that any consented development would be subject to mitigation and management

measures which would reduce impacts to non-significant unless there were exceptional

circumstances, it is accepted that such projects or schemes may contribute to a wider cumulative

impact.

67. Finally, in cases where this proposed scheme has negligible or no impact on a receptor (through for

example avoidance of impact through routeing or construction methodology) it is considered that

there is no pathway for a cumulative impact.

7.5 Existing Environment

7.5.1 Overview

68. The island of Great Cumbrae is located in the Firth of Clyde about 1.5km from the mainland. The

majority of the coast of the island is characterised by an emergent rock platform, with isolated pocket

bays containing beaches. The rock foreshore is currently stable with low rates of change. Millport Bay

is the part of the island coast that contains larger lengths of mobile beach sediment. The bay can be

divided into three parts:

• Kames Bay located in the northeast corner of Millport which contains a 150m-wide sandy beach;

• a sandy beach (about 50m wide) on rock platform at Newtown Bay; and,

• the rest of the Millport shore, which has a sand and gravel veneer overlying rock platform.



14

69. Millport Bay faces south, with Kames Bay (at the eastern end) aligned to the south-southwest. Within

the bay, there are large rock outcrops, known as the Eileans, the Leug and the Spoig, which provide

shelter to the central section of Millport Bay against waves from the south. The shelter provided by

these outcrops has led to the deposition of sand in their lee along the Newtown Bay shoreline (i.e.

forming a small salient).

70. Although the seawater in Millport Bay is fully marine, Smith (1955) observed that there was a

significant interstitial input of freshwater creating permanently brackish conditions locally on the

beach. Smith (1955) suggested that this was the result of rainwater which collects on a clay layer

above the underlying rocks in the dip of the Great Cumbrae Fault, and subsequently seeping through

the sand (creating local brackish conditions).

7.5.2 WFD Waterbody Classification

71. The proposed scheme is located within the Largs Channel (Fairlie Roads) coastal WFD waterbody

(ID: 200026) (Figure 7.1, Volume II). The waterbody has an overall Status of ‘Good’, with an overall

Ecology Status of ‘Good’, a Hydromorphology Status of ‘Good’ and Chemical Status of ‘Pass’. The

water body is expected to maintain this status in 2021 and 2027. Full classification details of this

waterbody are provided in Table 7-9.

Table 7-9 2017 Classification status of Largs Channel (Fairlie Roads) coastal water body

Parameter Status Confidence of Class

Overall Status Good High

Macro-invertebrates Good Medium

Alien species Good High

Morphology Good Medium

Specific pollutants Pass High

Macroalgae Good High

Dissolved Inorganic Nitrogen High Medium

Dissolved Oxygen High High

7.5.3 Millport Bay Bathing Water

72. Millport Bay bathing water is located between Marine Parade in the east and Knox’s Pier in the west

(Figure 7.1, Volume II). The bathing season runs between the 1st June and the 15th September during

which SEPA undertake water monitoring. Overall, the bathing water quality within Millport Bay during

2018 has been reported by SEPA as ‘Excellent’2. SEPA reports that the potential pollutant sources

at, or near the Millport Bay bathing water include four sewage pumping stations, and a surface water

discharge. However, SEPA reports that there are no significant pollution inputs to the Millport bathing

water under dry weather conditions.

2 https://apps.sepa.org.uk/bathingwaters/Classifications.aspx



15

7.5.4 Shellfish Waters

73. The Fairlie Shellfish Designated Water for mussels and oyster is located approximately 3.4km to the

west of the proposed scheme at Fairlie. The area is also designated as a Shellfish Harvesting Area

by the Food Standards Agency (FSA) for Class A and Class B oysters.

74. The most recently available monitoring results show that the Fairlie shellfish water had an overall

result of Pass for the water quality and biota standard, however it failed to meet the standard for

faecal coliforms. SEPA consider that livestock farming is the most likely cause of Fairlies past failures

to meet shellfish water standards3.

75. Under the WFD, the target objectives expect this shellfish water to Pass by 2021 (first River Basin

Management Plan (RBMP) Cycle) for Imperative Shellfish Growing Water Standards with high

confidence but the Guideline Shellfish Growing Water Standards is also predicted to pass by 2021

but with low confidence. No improvement actions are scheduled for this shellfish water.

76. Due to the distance of this shellfish water from the proposed scheme, it is considered that there is no

pathway for potential water quality impacts arising from the proposed scheme to affect the shellfish

water. As such this receptor is not considered further in this assessment.

7.5.5 Sediment Quality

77. A drop-down video survey was undertaken in January 2018 in the subtidal nearshore zone throughout

Millport Bay (Aquatic Survey and Monitoring Ltd (ASML), 2018) and described the biotopes present

within the bay. For the purposes of this report, the analysis is simplified to describe generalised

particle size only from the original descriptions (Chapter 6, Table 6-9). The results show that the

eastern part of Millport Bay (east of the Eileans) is dominated by a fine sand substrate closer to shore

and a muddy substrate further offshore. Across the western part of the bay and within the vicinity of

the Eileans the sea bed is either mixed sediment or rock outcrop. Further south, in the western part

of the bay, the sea bed is muddy (Figure 6-7, Volume II). This pattern of substrate correlates with the

bathymetry recorded across this area (Figure 6-4, Volume II).

78. To provide information on any chemical contamination present within the sediments, a geotechnical

site investigation survey was undertaken in September 2019. Using vibrocores, sediment cores

within, and adjacent to the footprint of the offshore breakwater (Figure 7-2, Volume II) were collected.

These were pushed through the sediment layer until core hit the bed rock. Sediment samples were

then taken from the surface, mid and bottom of the cores and sent to a certified laboratory

(SOCOTEC) for chemical and physical analysis.

79. The results of the analysis are presented in Appendix 7.1 (Volume III). A summary of the results is

provided below for ease of reference.

7.5.5.1 Particle Size Analysis

80. PSA results show that the sediment present within the offshore proposed scheme is comprised of

mixed sediments with the majority comprising sand and silt, and the surface samples being mainly

comprised of coarser sediment. The samples taken at mid- and bottom depth were made up of finer

material.

3 http://apps.sepa.org.uk/shellfish/pdf/47.pdf



16

7.5.5.2 Heavy Metals and Organotins

81. Concentration levels of heavy metals were found to be very low across samples. The mid-core

sample taken from VC06 contained slightly elevated levels of cadmium, chromium, mercury and lead.

In addition, slightly elevated levels of copper were found in the mid- and bottom-core samples of

VC04 and VC05. However, none of the heavy metals found were present at levels of concern and

only marginally exceeded MS Action Level 1. When averaged, the concentration of all the heavy

metals present in the samples is below MS Action Level 1.

82. Levels of organotins (tributyltin and dibutyltin) were found to be less than the Limit of Detection and

are therefore not of concern.

7.5.5.3 Polyaromatic Hydrocarbons

83. Levels of all polyaromatic hydrocarbons (PAH) were found to be below MS Action Level 1. As such

these contaminants are not present within the sediment at levels of concern.

7.5.5.4 Organohalogens

84. Levels of all organohalogens were found to be below MS Action Level 1. As such these contaminants

are not present within the sediment at levels of concern.

7.5.6 Anticipated Trends in Baseline Conditions

85. It is important to recognise that the baseline physical environment is not static, but instead will exhibit

considerable variability due to cycles or trends of natural change. These can include (for example)

the short-term effects of storms and surges, the well-observed patterns in the movement of tides

during spring and neap cycles and the longer-term effects of sea-level rise associated with global

climate change. Climate change will also likely alter rainfall patterns and bring more heavy

downpours. Coupled with the increased risk of storm level surges the frequency of flooding events

within coastal areas is expected to increase in the future. However, it is not anticipated that this would

result in a significant change in the current water and sediment quality environment within Millport

Bay and the wider Largs Channel area.

7.6 Embedded Mitigation

7.6.1.1 Scheme Design

86. Embedding mitigation into the proposed scheme design is a type of primary mitigation and is an

inherent aspect of the EIA process. A full account of embedded mitigation measures is contained in

Chapter 5 Project Description.

87. The current construction schedule for dredging and offshore construction works will avoid the Bathing

Water season which would be a mitigation measure recommended by SEPA. Further mitigation

measures relevant for marine water and sediment quality would include the adherence to the standard

best practice and policy requirements as set out in Section 7.4.1.

88. As the guidance notes set out in Section 7.4.1 will be followed throughout the construction and

operation of the proposed scheme the risk of an accidental spill occurring is considered to be

adequately mitigated and will not be considered further, as set out in the Scoping Report.



17

7.7 Potential Impacts during Construction

89. This section discusses the potential impacts which may occur to marine water and sediment quality

receptors during activities associated with the construction of the proposed scheme. Impacts to

marine geology, oceanography and physical processes are considered in Chapter 6 Marine

Geology, Oceanography and Physical Processes. Impacts to intertidal and marine habitats and

species are considered in Chapter 8 Benthic and Intertidal Ecology.

90. Three potential impacts to marine water and sediment quality resulting from the construction stage

have been identified. These are described in Table 7-10:

Table 7-10 Potential construction impacts

Activity Receptor Impact

Capital

dredge

Disturbance of sediments and release of

sediment-bound substances into the

water column

Changes to classification status of designated RBMP

water bodies or Bathing Waters as a result of

noncompliance with standards

Deposition of mobilised sediments on

sea bed

Changes to sediment quality classification in the areas

affected by sediment deposition

7.7.1 Construction Impact 1: Deterioration in water quality resulting from the

disturbance of sediments and release of sediment-bound contaminants

into the water column

91. Construction works to be undertaken which could affect the water quality of the Millport Bay Bathing

Water and the Largs Channel (Fairlie Roads) coastal water body include:

• Removal of sediments covering the bedrock within the footprint of the offshore breakwaters using

water injection dredging (WID); and

• The excavation of intertidal beach sediment to allow for the construction of the onshore breakwater,

including the grouting of dowel bars into the bedrock to tie in the toe beam of the onshore breakwater

and revetment.

92. Some excavation of sediment within the intertidal zone may be required for construction of the

onshore rock armour breakwater, the Clyde Street rock armour revetment and the refurbishment of

the existing jetties. In total this will remove approximately 210m3 of sediment from the intertidal beach

at Millport. The sediment present on the beach is coarse sand and as such will not contain significant

concentrations of contaminants as they do not sorb easily to coarser sediments compared to fine

sediments (National Research Council (NRC), 1997). The sediment will be scraped to the side and

retained elsewhere on the beach above the mean high-water mark to ensure that none is lost with

the tide.

93. There will also be a small amount of bedrock excavation for construction of the toe to the stepped

concrete revetments, of approximately 150m3 in total. The excavated rock will likely be used a fill

beneath the new revetments. The excavation of the bedrock will also take place at low tide and as

such is not considered to have an adverse impact on marine water quality. Should any of the arisings

be washed out by the tide this is also not considered to have an adverse impact as the volume is

predicted to be very small and would not contain any contaminants.



18

94. The installation of steel dowel bars will require the use of grout to secure them in place. The risk of

impacts from the release of grout into the marine environment will be minimised using best-practice

control measures which will be detailed in a Construction Environment Management Plan (CEMP).

These would include ensuring the grout is not spilled by not overfilling the holes and any spillages

should be cleaned up immediately.

95. If required, the removal of sediments from within the footprint of the proposed offshore breakwaters

is proposed to be undertaken by WID. There is approximately 1m to 2m of sediment present over

the bedrock. It is currently expected to be possible to construct the offshore breakwaters directly onto

this sediment, without the need to dredge to bedrock. However, if areas of greater sediment depth

or particularly loose sediment are encountered at the time of construction then a limited volume of

dredging may be required. It is estimated that a maximum of 25,000m3 of sediment would need to

be removed from the footprint of the breakwaters, with the total sediment excavation volume more

likely to be less than 10,000m3. The indicative construction programme estimates that any dredging

would be undertaken during February 2022 and will take up to three weeks to complete.

96. Chemical analysis undertaken on the sediment within the footprint of the offshore breakwaters

showed that there were five individual samples which contained marginal exceedances of Action

Level 1 for the heavy metals copper, cadmium, chromium, mercury and lead. However, when

averaged the concentrations of these heavy metals did not exceed Action Level 1. All other

contaminants were found at levels below Action Level 1 and are therefore not of concern.

97. An increase in suspended sediment concentration during the construction of the proposed scheme

could also lead to a potential reduction in water clarity and therefore quality. Changes in suspended

sediment concentrations were assessed to be negligible within Chapter 6 Section 6.8.1. The

process of WID will fluidise the sediment at the sea bed and would not cause a significant increase

in suspended sediment throughout the water column. PSA shows the dredged sediment is comprised

of coarse but fine mixed material, rather than containing lots of fine silty sediment, which will reduce

the risk of sediment plumes. The low silt levels are also unlikely to affect other water quality

parameters such as dissolved oxygen and in addition to this the dredge will be carried out in the

winter, further minimising any risk to dissolved oxygen. The coastal water body would also therefore

not be restricted in terms of dilution. Additionally, the works are short term (up to three weeks) and

would not be undertaken continuously.

98. Water quality within Millport Bay and the Largs Channel (Fairlie Roads) coastal water body is

considered to be of medium value as the area supports designations such as Millport Bay bathing

water, which is classed as ‘Excellent’ but the receiving water body is large compared to the size of

the proposed scheme and has a large capacity for dilution and flushing.

99. Adherence to the proposed methodologies and standard best practice measures described above

(Section 7.4.1), supported by a CEMP, the intertidal works are considered to have an effect of

negligible magnitude on the Bathing Water and coastal waterbody. The low levels of contamination

within the sediment, the duration and the timing of the offshore dredge are also considered to have

an effect of negligible magnitude on the Bathing Water and coastal water body. This therefore

results in an impact of minor adverse significance (which is considered to be not significant).

Mitigation

100. No mitigation is required to reduce the impact significance.



19

Residual Impact

101. The residual impact is minor adverse, which is Not Significant.

7.7.2 Construction Impact 2: Deposition of mobilised sediments on the sea bed

causing a deterioration in sediment quality

102. WID is a hydrodynamic dredging technique where the sediment is remobilised using the action of

natural currents. Water is pumped into the sediment at low pressure, fluidising the sediment and

turning it into a density current which remains close to the sea bed. This fluidised sediment is then

picked up by natural currents and flow horizontally away from the dredged area. The method ensures

that the sediment remains within the sediment budget of the area and minimises dramatic increases

in the suspended sediment concentrations within the water column.

103. The chemical analysis carried out on the sediment within the footprint of the offshore breakwaters

shows that the sediment contains very marginal exceedances of heavy metals within five samples.

These concentrations, when averaged, do not exceed Action Level 1. All other contaminants were

present at levels below Action Level 1 and are not of concern to water or sediment quality (Appendix

7.1, Volume III).

104. As such these sediment contaminant concentrations do not present a risk to sea bed sediments,

infauna or epifauna where the sediment may be deposited. Consequently, the potential magnitude

of this effect is considered to be negligible. The sensitivity of the Largs Channel (Fairlie Roads)

coastal water body and the Millport Bay Bathing Water to this impact are the same as that defined in

Impact 1 – medium. This therefore results in an impact of minor adverse significance (which is

considered to be not significant).

Mitigation


Residual Impact

106. The residual impact is minor adverse which is Not Significant.

7.8 Potential Impacts during Operation

107. This section discusses the potential impacts which may occur to marine water and sediment quality

receptors during activities associated with the operation of the proposed scheme. Impacts to marine

geology, oceanography and physical processes are considered in Chapter 6 Marine Geology,

Oceanography and Physical Processes. Impacts to intertidal and marine habitats and species are

considered in Chapter 8 Benthic and Intertidal Ecology.

108. Potential impacts to marine water and sediment quality during the operation of the proposed scheme

are defined in Table 7-11.



20

Table 7-11 Potential operational impacts

Activity Receptor Impact

Reduced flushing of water within

Millport Bay due to enclosure of

water within breakwater

Entrainment of

contaminants

Changes to classification status of designated RBMP

water bodies or Bathing Waters as a result of

noncompliance with standards.

7.8.1 Operation Impact 1: Entrainment of contaminants due to decreased

flushing of water within Millport Bay

109. The presence of an offshore breakwater has the potential to result in reduced flushing of water within

Millport Bay, potentially leading to a reduction in water quality through the entrainment of

contaminants entering the Bay from river/stream discharges during flood events. Chapter 6 Marine

Geology, Oceanography and Physical Processes assessed the potential changes to the tidal

current regime due to the presence of the proposed scheme (Chapter 6, Section 6.9.2) which is

summarised here for ease of reference.

110. Millport Bay is a sheltered area where baseline tidal currents are low. Flows are complicated by their

interaction with the offshore islands and are likely to accelerate slightly through the gaps between

The Leug, The Spoig and the southern Eilean islet rock outcrop. The presence of the offshore

breakwater would close the gaps between the islands and provide a permanent barrier to the

movement of water between the islands. However, the passage of water into the Bay would still be

effective around the east and west sides of the breakwaters, as water will be forced in these directions

by the obstruction.

111. The predicted changes to circulation and the local increases and decreases in current velocity are

not significant because the existing currents are already very low velocity. The barrier across the

central passage of water would not significantly affect the flushing ability of the Bay as the passages

to the east and west would continue to allow entry and exit of water. The impact assessment in

Chapter 6, Section 6.9.2 concluded that the presence of the proposed scheme would have an impact

of negligible significance on tidal currents, and consequently the flushing ability, within Millport Bay.

112. As such the magnitude of this potential impact is considered to be negligible on water quality. The

Largs Channel (Fairlie Roads) coastal water body and the Millport Bay Bathing Water are considered

to have a sensitivity of medium as the entrainment of contaminants is considered to be unlikely and

recoverable in the short term (less than one year). As such the potential impact is of minor adverse

significance (which is considered to be not significant).

Mitigation


Residual Impact

114. The residual impact is minor adverse which is Not Significant.

7.9 Potential Impacts during Decommissioning

115. The structures forming the coastal flood prevention scheme would be designed to have a life of at

least 50 years. As the purpose of the proposed scheme is for flood protection, it is unlikely that it

would be decommissioned entirely; it is more likely that the scheme would be repaired, or sections



21

replaced or improved if needed in the future. No decision has been made regarding the final

decommissioning policy for the offshore infrastructure of the proposed scheme as it is recognised

that industry best practice, rules and legislation change over time.

116. The detail and scope of the decommissioning works will be determined by the relevant legislation and

guidance at the time of decommissioning and agreed with the regulator. As discussed in Chapter 5

Project Description, a decommissioning plan will be submitted for approval by the regulatory

authorities prior to construction. As such, impacts no greater than those identified for the construction

phase are expected for the decommissioning phase.

7.10 Cumulative Impact Assessment

117. This section describes the CIA for marine water and sediment quality and will consider the Hunterston

Marine Construction Yard Proposals. Currently there are no other marine construction projects

planned which could result in cumulative effects with the proposed scheme.

118. Peel Ports own Hunterston Marine Construction Yard and are planning to construct, decommission

or reverse engineer large marine related structures. This will require improvements to the

hammerhead quay (and associated dredging) and creation of dock gates to the existing dry dock.

119. The proposals will take place within the Largs Channel (Fairlie Roads) coastal water body and is

approximately 3km from the Millport Bay Bathing Water and therefore could result in cumulative

impacts with the proposed scheme in relation to overlap of sediment plumes which could lead to

changes in physico-chemical parameters and contaminants. However, information for the proposed

dredge at Hunterston is not available and as such a cumulative impact on the marine water and

sediment quality of the coastal water body and the Bathing Water is not yet possible. It is therefore

assumed that any consented development would be subject to mitigation and management measures

which would reduce impacts to non-significant unless there were exceptional circumstances, it is

accepted that such projects or schemes may contribute to a wider cumulative impact.

120. The potential cumulative impact between the proposed scheme and the Hunterston proposals will

therefore be assessed within the submission for the Hunterston proposals.

7.11 Inter-relationships

Table 7-12 lists out the inter relationships between other chapters within the ES.



22

Table 7-12 Inter-topic relationships

Topic Related Chapter Where addressed

in this chapter Rationale

Effects on water quality

arising from dredging

activities

Chapter 9 Fish and

Shellfish Resource

Sections 7.7 and

7.8

Changes in water quality may adversely impact fish

within spawning or nursery grounds

Chapter 12

Commercial

Fisheries

Changes in water quality may affect the quality,

movement or location of commercial fish or shellfish

species or fishing grounds

Chapter 23 Tourism

and Recreation

Changes in water quality may prevent tourism and

recreation activities within Millport Bay

Changes in sediment

quality arising from

dredging activities

Chapter 8 Benthic

and Intertidal

Ecology

Changes in sediment quality through the deposition

of contaminated sediment may affect benthic

communities

7.12 Interactions

121. The impacts identified and assessed in this chapter have the potential to interact with each other,

which could give rise to synergistic impacts as a result of that interaction. The worst-case impacts

assessed within this chapter take these interactions into account and for the impact assessments are

considered conservative and robust. For clarity, the areas of interaction between impacts are

presented in Table 7-13 along with an indication as to whether the interaction may give rise to

synergistic impacts.

Table 7-13 Potential interaction between impacts

Potential interaction between impacts

Construction

1: Deterioration in water quality resulting from

the disturbance of sediments and release of

sediment-bound contaminants into the water

column

2:

Deposition

of mobilised

sediments

on the sea

bed causing

a

deterioration

in sediment

quality

1: Deterioration in water quality resulting from

the disturbance of sediments and release of

sediment-bound contaminants into the water

column

Yes

2: Deposition of mobilised sediments on the

sea bed causing a deterioration in sediment

quality

Yes

Operation 1: Entrainment of contaminants due to

decreased flushing of water within Millport Bay



23

Potential interaction between impacts

1: Entrainment of contaminants due to

decreased flushing of water within Millport Bay Yes

7.13 Summary

122. The main potential impacts of the proposed scheme on marine water and sediment quality receptors

have been identified. Three potential impacts during construction and two potential impacts during

operation have been identified. A summary of the potential impacts and proposed mitigation is

presented in Table 7-14.

Table 7-14 Potential Impacts Identified for marine water and sediment quality

Potential Impact Receptor Value Magnitude Significance Mitigation

Measures

Residual

Impact

Construction

Impact 1:

Deterioration in

water quality

resulting from the

disturbance of

sediments and

release of

sediment-bound

contaminants into

the water column

Millport Bay

Bathing Water

and Largs

Channel (Fairlie

Roads) coastal

water body

Medium Negligible Negligible n/a Minor

Adverse

Impact 2:

Deposition of

mobilised

sediments on the

sea bed causing a

deterioration in

sediment quality

Millport Bay

Bathing Water

and Largs

Channel (Fairlie

Roads) coastal

water body


Adverse

Operation

Impact 1:

Entrainment of

contaminants due

to decreased

flushing of water

within Millport Bay

Millport Bay

Bathing Water

and Largs

Channel (Fairlie

Roads) coastal

water body


Adverse

Decommissioning

As a flood prevention scheme, the proposed scheme is anticipated to be maintained rather than removed, and

therefore decommissioning activities are currently unknown. This will be assessed at the time of any

decommissioning activities required.



24

7.14 References

ASML (2018) Millport Flood Protection Scheme – Drop Down Video Survey Report. Report to Royal

HaskoningDHV, February 2018.

EA, NIEA and SEPA (2012) Working at construction and demolition sites: PPG6. 2nd Edition 2012

NIEA, SEPA and NRW (2017) GPP 21: Pollution Incident Response Plans. July 2017

NIEA, DAERA, SEPA and NRW (2018) Guidance for Pollution Prevention: Works and maintenance in or

near water: GPP5. Version 1.2. February 2018

NIEA, DAERA, SEPA and NRW (2018a) Guidance for Pollution Prevention. Dealing with spills: GPP 22.

Version 1. October 2018

North Ayrshire Council, East Ayrshire Council and South Ayrshire Council (2007) Ayrshire Joint Structure

Plan. Available at: https://www.south-

ayrshire.gov.uk/documents/ayrshire%20joint%20structure%20plan%202007.pdf. Accessed: 20.11.19.

North Ayrshire Council (2019) Local Development Plan. Available at: https://www.north-

ayrshire.gov.uk/planning-and-building-standards/ldp/local-development-plan.aspx Accessed 30.01.20.

NRC (1997) Contaminated Sediments in Ports and Waterways: Cleanup Strategies and Technologies.

Washington, D.C.: The National Academic Press

Scottish Government (2014a) National Planning Framework (NPF) Available at:

https://www.gov.scot/publications/national-planning-framework-3/ Accessed: 20.11.19.

Scottish Government (2014b) Scotland’s Planning Policy (SPP). Available at:

https://www.gov.scot/publications/scottish-planning-policy/ Accessed: 20.11.19.

Scottish Government (2019) Planning Advice Notes. Available at

https://www.gov.scot/collections/planning-advice-notes-pans/ Accessed: 20.11.19.

SEPA (2019) Supporting Guidance (WAT-SG-53) Environmental Quality Standards and Standards for

Discharges to Surface Waters. Version 7. September 2019

Title:

Project:Millport Flood

Protection Scheme- EIA Report

Client:

Contains OS data © Crown Copyrightand database right 2019

North Ayrshire Council

±

Drawn: Scale:Checked:Date:Revision:

Drawing No:

Size:

British National Grid

Figure:

Co-ordinate system:

!(

Contains OS data © Crown Copyright and database right 2019

216000

216000

222000

222000

6540

00

6540

00

6600

00

6600

00

ROYAL HASKONINGDHV

±

Marlborough HouseMarlborough Crescent

Newcastle-upon-Tyne, NE1 4EE+44 (0)191 211 1300

www.royalhaskoningdhv.com

7.1

0 3 Kilometres

Legend

1:50,0000 TC A3SM14/11/2019

Location of WFD water bodiesand Bathing Waters

Redline BoundaryLargs Channel (Fairlie Roads) coastal WFD water body

© HaskoningDHV UK Ltd.© Crown copyright and database rights 2019 Ordnance Survey 100023393.Use of this data is subject to terms and conditions.

Bathing Water Quality: Millport Bay - Excellent!(

Title:

Project:Millport Flood

Protection Scheme- EIA Report

Client:

Contains OS data © Crown Copyrightand database right 2019

North Ayrshire Council

±

Drawn: Scale:Checked:Date:Revision:

Drawing No:

Size:

British National Grid

Figure:

Co-ordinate system:

!(!(

!(!(

!(!(

!(

VC06

VC05VC04

VC03

VC02

VC01

VC03a

216000

216000

217000

217000

6540

00

6540

00

6550

00

6550

00

ROYAL HASKONINGDHV

±

Marlborough HouseMarlborough Crescent

Newcastle-upon-Tyne, NE1 4EE+44 (0)191 211 1300

www.royalhaskoningdhv.com

7.2

0 200 400 Metres

Legend

0 TC A3SM14/11/2019

Location of vibrocore samples

Redline BoundaryPotential Site CompoundPotential Materials StorageFlood WallsRock BreakwaterRock RevetmentModifications to existing coast protection structuresModifications to existing promenade and grass areasOffshore Breakwater

!( Vibrocore Sample Locations

© HaskoningDHV UK Ltd.© Crown copyright and database rights 2019 Ordnance Survey 100023393.Use of this data is subject to terms and conditions.

1:6,0001:6,5001 TC A3AS04/02/2020

REPORT

Millport Coastal Flood Protection

Scheme: Environmental Statement

Appendix 7.1 Pre-Disposal Sampling Results Form

Client: North Ayrshire Council

Reference: PB4749-RHD-ZZ-XX-RP-Z-0007.1

Status: Final/F01


a b

Pre-disposal Sampling Results Form Version 2 - June 2017

This form should be used to submit the results from your pre-disposal sampling plan.

Full information must be provided in all relevant sheets of this workbook. The blue cells in each worksheet indicate where information can be entered.

Where information cannot be provided, or where there are more than 30 samples required, please contact the Marine Scotland - Licensing Operations Team (MS-LOT)

using the contact details below.

Once you have completed this form, send it (including any reference number for the dredging and sea disposal marine licence application in the subject header of your email) to the following email address:

[email protected]

If you have any questions in relation to this form contact MS-LOT:

Marine Scotland - Licensing Operations Team

Marine Laboratory

375 Victoria Road

Aberdeen, AB11 9DB

01224 295579

[email protected]

mailto:[email protected]

mailto:[email protected]

Applicant Information

Sample Details & Physical Properties

Sample information:

MAR00392.00 VC01 ES1 ° . ˈN ° . ˈW 0 84 14.3 35.1 50.7

MAR00392.00 VC01 ES3 ° . ˈN ° . ˈW 1.1 87.7 42 31.4 26.6

MAR00392.00 VC01 ES2 ° . ˈN ° . ˈW 5.7 89.2 18.6 40.4 41

MAR00392.00 VC02 ES1 ° . ˈN ° . ˈW 0 87.3 58 28.3 13.7

MAR00392.00 VC02 ES2 ° . ˈN ° . ˈW 1.3 84.8 2.1 41.8 56.2

MAR00392.00 VC02 ES3 ° . ˈN ° . ˈW 2 85.1 0 36.6 63.4

MAR00392.00 VC03 ES1 ° . ˈN ° . ˈW 0 82.3 63 29.4 7.6

MAR00392.00 VC03 ES2 ° . ˈN ° . ˈW 0.3 86.1 22.2 58 19.7

MAR00392.00 VC03A ES1 ° . ˈN ° . ˈW 0 82.2 76.7 15.4 7.8

MAR00392.01 VC04 ES1 ° . ˈN ° . ˈW 0 84.8 22.5 64.4 13.1

MAR00392.01 VC04 ES2 ° . ˈN ° . ˈW 0.7 88.1 29.2 39.1 31.7

MAR00392.01 VC04 ES3 ° . ˈN ° . ˈW 1.7 88.9 12.5 38.8 48.7

MAR00392.01 VC05 ES1 ° . ˈN ° . ˈW 0 85.9 59.4 26.3 14.3

MAR00392.01 VC05 ES2 ° . ˈN ° . ˈW 1.4 87 12.6 34.2 53.2

MAR00392.01 VC05 ES3 ° . ˈN ° . ˈW 2.8 83.3 17.4 27 55.5

MAR00392.01 VC06 ES1 ° . ˈN ° . ˈW 0 83.3

MAR00392.01 VC06 ES2 ° . ˈN ° . ˈW 1.45 92.3 22.3 34.2 43.5

MAR00392.01 VC06 ES3 ° . ˈN ° . ˈW 1 89.7 24 33.6 42.4

° . ˈN ° . ˈW° . ˈN ° . ˈW° . ˈN ° . ˈW° . ˈN ° . ˈW° . ˈN ° . ˈW° . ˈN ° . ˈW° . ˈN ° . ˈW° . ˈN ° . ˈW° . ˈN ° . ˈW° . ˈN ° . ˈW° . ˈN ° . ˈW° . ˈN ° . ˈW

Silt

(%)

Total amount to be dredged (wet tonnes)

Explanatory Notes:

An example of a 'Dredge area' is: 'Dock A, Harbour X'

Provide description of the dredge area and the latitude and longitude co-oridnates (WGS84) for each sample location. Co-ordinates taken from GPS equipment should be set to WGS84.

Note for sample depth that the seabed is 0 metres.

Gravel is defined as >2mm, Sand is defined as >63um<2mm, Silt is deinfed as <63um).

Sample ID Dredge area Latitude Longitude

TOC

(%) Specific gravity Asbestos

Type of

sample

Sample depth

(m)

Total solids

(%)

Gravel

(%)

Sand

(%)

Applicant:

Description of dredging:

Trace Metals & Organotins

Sample information:

Arsenic (As) Cadmium (Cd) Chromium (Cr) Copper (Cu) Mercury (Hg) Nickel (Ni) Lead (Pb) Zinc (Zn) Dibutyltin (DBT) Tributyltin (TBT)

MAR00392.00 VC01 ES1 0 0 7.6 0.18 16.3 15.9 <0.01 16.7 8.3 50.3 <0.001 <0.001

MAR00392.00 VC01 ES3 0 1.1 4.4 0.21 20.4 21.5 <0.01 19.4 6.1 40 <0.001 <0.001

MAR00392.00 VC01 ES2 0 5.7 2.9 0.16 16.3 18.1 <0.01 16.4 5.2 39.2 <0.001 <0.001

MAR00392.00 VC02 ES1 0 0 6.8 0.19 17.2 13.6 0.02 14.4 7.4 43.4 <0.001 <0.001

MAR00392.00 VC02 ES2 0 1.3 4 0.15 17.2 18.9 <0.01 17.2 5.8 33.6 <0.001 <0.001

MAR00392.00 VC02 ES3 0 2 3.7 0.17 16.5 21.4 <0.01 16.2 5.5 42.1 <0.001 <0.001

MAR00392.00 VC03 ES1 0 0 5.6 0.11 15.9 14.6 0.02 14.5 6.6 52.4 <0.001 <0.001

MAR00392.00 VC03 ES2 0 0.3 3.5 0.12 13.5 13.2 <0.01 11.1 5.2 38.4 <0.001 <0.001

MAR00392.00 VC03A ES1 0 0 7.1 0.16 13.8 12.7 0.014 10.4 9.7 44.3 <0.001 <0.001

MAR00392.01 VC04 ES1 0 0 6.6 0.14 14.9 12.5 <0.01 13 11.6 47.9 <0.001 <0.001

MAR00392.01 VC04 ES2 0 0.7 3.3 0.16 21.8 30.2 <0.01 22 7.6 53.5 <0.001 <0.001

MAR00392.01 VC04 ES3 0 1.7 3.7 0.2 24.3 56.6 <0.01 25.2 7.8 57.6 <0.001 <0.001

MAR00392.01 VC05 ES1 0 0 7.7 0.16 20.2 20.7 0.036 24.2 8.4 67.1 <0.001 <0.001

MAR00392.01 VC05 ES2 0 1.4 4.6 0.15 22.5 61.9 0.011 25.4 7.6 67.3 <0.001 <0.001

MAR00392.01 VC05 ES3 0 2.8 5.2 0.15 23.1 31.7 <0.01 25.5 8.9 71.2 <0.001 <0.001

MAR00392.01 VC06 ES1 0 0 7.8 0.14 15.6 14.5 <0.01 17.1 11.2 57.4 <0.001 <0.001

MAR00392.01 VC06 ES2 0 1.45 4.1 1.42 52.4 26.2 0.56 29 68 55 <0.001 <0.001

MAR00392.01 VC06 ES3 0 1 4.1 0.15 22.1 27.1 0.02 22.8 7.7 70.5 <0.001 <0.001

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

Explanatory Notes:

Results above Action Level 1 will be highlighted in blue and above Action Level 2 in red.

Sample ID Dredge area

Type of

sample

Sample depth

(m) mg/kg dry weight

Polyaromatic Hydrocarbons (PAH)

Definitions:

ACENAPTH Acenaphthene

ACENAPHY Acenaphthylene

ANTHRACN Anthracene

BAA Benz(a)anthracene

BAP Benzo(a)pyrene

BBF Benzo(b)fluoranthene

BEP Benzo(e)pyrene

BENZGHIP Benzo(ghi)perylene

BKF Benzo(K)fluoranthene

C1N C1-naphthalenes

C1PHEN C1-phenanthrene

C2N C2-naphthalenes

C3N C3-naphthalenes

CHRYSENE Chrysene

DBENZAH Diben(ah)anthracene

FLUORANT Fluoranthene

FLUORENE Fluorene

INDPYR Indeno(1,2,3-cd)pyrene

NAPTH Naphthalene

PERYLENE Perylene

PHENANT Phenanthrene

PYRENE Pyrene

THC Total Hydrocarbon Content

Sample information:

ACENAPTH ACENAPHY ANTHRACN BAA BAP BBF BEP BENZGHIP BKF C1N C1PHEN C2N C3N CHRYSENE DBENZAH FLUORANT FLUORENE INDPYR NAPTH PERYLENE PHENANT PYRENE THC

MAR00392.001 VC01 ES1 0 0 <1 <1 <1 1.49 2.53 3.26 2.62 3.47 1.66 1.71 2.01 1.77 1.9 1.94 <1 2.49 <1 2.73 <1 1.13 1.9 2.98 5100

MAR00392.002 VC01 ES3 0 1.1 <1 <1 <1 <1 <1 1.7 1.34 1.45 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 1.31 <1 1720

MAR00392.003 VC01 ES2 0 5.7 <1 <1 <1 <1 <1 1.88 1.59 1.75 <1 <1 <1 <1 <1 <1 <1 1.45 <1 <1 <1 <1 2.07 1.18 1550

MAR00392.004 VC02 ES1 0 0 <1 <1 2.28 5.85 10.5 11.5 9 9.91 4.68 2.74 5.21 3.16 3.17 7.25 1.7 10.4 <1 9.78 1.46 2.72 5.18 15.1 11500

MAR00392.005 VC02 ES2 0 1.3 <1 <1 <1 <1 <1 2.11 1.65 1.68 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 1.69 <1 1360

MAR00392.006 VC02 ES3 0 2 <1 <1 <1 <1 <1 1.84 1.57 1.4 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 1.45 <1 2030

MAR00392.007 VC03 ES1 0 0 <1 <1 2.14 7.49 11 11.2 9.62 10.9 6.62 4.64 7.66 4.66 5.97 8.64 1.62 13.6 <1 10.6 2.15 3.25 6.58 15.1 13900

MAR00392.008 VC03 ES2 0 0.3 <1 <1 2.68 3.37 4.62 4.54 3.74 4.61 1.95 1.78 2.82 2.14 1.94 4.46 <1 6.75 <1 3.87 1.99 1.57 2.65 6.78 4730

MAR00392.009 VC03A ES1 0 0 <1 1.22 3.31 10.6 14.8 15.9 12.6 15.5 7.3 7.3 10.6 7.65 8.69 11.6 2.38 17.8 1.61 14.5 3.26 3.93 9.43 18.9 20400

MAR00392.010 VC04 ES1 0 0 <1 <1 <1 <1 1.47 1.61 1.54 2.06 <1 1.28 1.37 <1 <1 1.39 <1 1.7 <1 1.65 <1 <1 1.35 1.91 11100

MAR00392.011 VC04 ES2 0 0.7 <1 <1 <1 <1 <1 1.15 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 1.2 <1 2520

MAR00392.012 VC04 ES3 0 1.7 <1 <1 <1 <1 <1 1.44 1.17 1.36 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 1.41 <1 2280

MAR00392.013 VC05 ES1 0 0 <1 <1 1.86 3.7 3.83 5.41 4.21 5.46 1.88 6.09 16.1 13.5 25.1 4.64 <1 5.6 1.6 3.46 1.55 1.58 7.66 6.42 8480

MAR00392.014 VC05 ES2 0 1.4 <1 <1 <1 <1 <1 2.14 1.98 1.86 <1 <1 <1 <1 <1 1.31 <1 1.59 <1 <1 <1 <1 2.52 1.35 1840

MAR00392.015 VC05 ES3 0 2.8 <1 <1 <1 <1 <1 2 1.71 1.95 <1 1.81 1.77 1.33 1.47 1.2 <1 1.31 <1 <1 <1 1.86 2.12 1.33 5130

MAR00392.016 VC06 ES1 0 0 <1 <1 1.85 4.97 7.47 8.72 7.04 8.44 4.19 13.5 10.2 14.6 12.3 5.81 1.28 8.62 <1 7.89 2.93 2.29 9.08 10 15200

MAR00392.017 VC06 ES2 0 1.45 <1 <1 <1 <1 <1 2.32 1.75 1.77 <1 <1 <1 <1 <1 1.2 <1 1.29 <1 <1 <1 1.86 1.95 <1 6360

MAR00392.018 VC06 ES3 0 1 <1 <1 <1 <1 <1 2.58 1.85 1.88 <1 <1 <1 <1 <1 1.28 <1 1.41 <1 <1 <1 1.92 1.97 <1 9890

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

Explanatory Notes:



Type of

sample

Sample depth

(m)

µg/kg

Organohalogens

Definitions:

AHCH alpha-Hexachlorcyclohexane

BHCH beta-Hexachlorcyclohexane

GHCH gamma-Hexachlorcyclohexane

DIELDRIN Dieldrin

HCB Hexachlorobenzene

PPDDE p,p'-Dichorodiphenyldicloroethylene

PPDDT p,p'-Dichorodiphenyltrichloroethane

PPTDE p,p'-Dichorodiphenyldicloroethane

Sample information:

PCB28 PCB52 PCB101 PCB118 PCB138 PCB153 PCB18 PCB105 PCB110 PCB128 PCB141 PCB149 PCB151 PCB156 PCB158 PCB170 PCB180 PCB183 PCB187 PCB194 PCB31 PCB44 PCB47 PCB49 PCB66 ICES7 AHCH BHCH GHCH DIELDRIN HCB DDE DDT TDE BDE100 BDE138 BDE153 BDE154 BDE17 BDE183 BDE209 BDE28 BDE47 BDE66 BDE85 BDE99

MAR00392.00 VC01 ES1 0 0 0.301 0.162 <0.08 <0.08 <0.08 <0.08 0.466 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.326 0.136 <0.08 0.12 <0.08 0.863 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.00 VC01 ES3 0 1.1 0.285 0.149 <0.08 <0.08 <0.08 <0.08 0.381 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.283 0.104 <0.08 0.117 <0.08 0.834 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.00 VC01 ES2 0 5.7 0.305 0.164 <0.08 <0.08 <0.08 <0.08 0.449 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.307 0.106 <0.08 0.139 <0.08 0.869 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.00 VC02 ES1 0 0 0.276 0.161 <0.08 <0.08 <0.08 <0.08 0.415 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.293 0.104 <0.08 0.111 0.083 0.837 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.00 VC02 ES2 0 1.3 0.192 0.105 <0.08 <0.08 <0.08 <0.08 0.257 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.254 <0.08 <0.08 0.081 <0.08 0.697 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.00 VC02 ES3 0 2 0.136 <0.08 <0.08 <0.08 <0.08 <0.08 0.205 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.138 <0.08 <0.08 <0.08 <0.08 0.616 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.00 VC03 ES1 0 0 0.318 0.131 <0.08 <0.08 <0.08 <0.08 0.411 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.308 0.1 <0.08 0.105 0.097 0.849 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.00 VC03 ES2 0 0.3 0.18 0.088 <0.08 <0.08 <0.08 <0.08 0.222 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.2 <0.08 <0.08 <0.08 <0.08 0.668 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.158 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.00 VC03A ES1 0 0 0.194 0.122 <0.08 <0.08 0.122 <0.08 0.282 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.206 <0.08 <0.08 <0.08 0.097 0.758 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.01 VC04 ES1 0 0 0.178 0.095 <0.08 <0.08 <0.08 <0.08 0.288 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.208 <0.08 <0.08 <0.08 <0.08 0.673 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.01 VC04 ES2 0 0.7 0.263 0.101 <0.08 <0.08 <0.08 <0.08 0.346 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.246 0.081 <0.08 <0.08 <0.08 0.764 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.01 VC04 ES3 0 1.7 0.186 0.092 <0.08 <0.08 <0.08 <0.08 0.234 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.185 <0.08 <0.08 <0.08 <0.08 0.678 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.01 VC05 ES1 0 0 0.561 0.289 <0.08 <0.08 <0.08 <0.08 0.699 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.575 0.204 0.083 0.216 0.13 1.25 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.251 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.01 VC05 ES2 0 1.4 0.397 0.201 <0.08 <0.08 <0.08 <0.08 0.658 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.407 0.154 <0.08 0.15 0.093 0.998 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.15 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.01 VC05 ES3 0 2.8 0.122 <0.08 <0.08 <0.08 <0.08 <0.08 0.188 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.144 <0.08 <0.08 <0.08 <0.08 0.602 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.01 VC06 ES1 0 0 0.243 0.122 <0.08 <0.08 <0.08 <0.08 0.353 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.252 <0.08 0.081 0.084 <0.08 0.765 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.01 VC06 ES2 0 1.45 0.354 0.17 <0.08 <0.08 <0.08 <0.08 0.528 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.351 0.105 <0.08 0.12 <0.08 0.924 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

MAR00392.01 VC06 ES3 0 1 0.216 0.17 <0.08 <0.08 <0.08 <0.08 0.353 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 0.266 0.122 <0.08 0.11 <0.08 0.786 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

µg/kg

Explanatory Notes:


ICES7 is the sum of PCB 28,52,101,138,153,180 and 118.


Type of

sample

Sample depth

(m)

PR Details

Average for the total dredge area:

Total Solids % 86.2

Gravel % 29.2

Sand % 36.1

Silt % 34.7

Arsenic (As) 4.5

Cadmium (Cd) 0.2

Chromium (Cr) 18

Copper (Cu) 21.3

Mercury (Hg) 0.04

Nickel (Ni) 16.8

Lead (Pb) 9.9

Zinc (Zn) 45.8

Dibutyltin (DBT) <0.001

Tributyltin (TBT) <0.001

Acenapth <1

Acenapthylene 1

Anthracn 1.33

BAA 2.36

BAP 3.18

BBF 3.83

BEP 3.12

Benzghip 3.61

BKF 1.93

C1N 2.4

C1PHEN 3.21

C2N 2.84

C3N 3.39

Chrysene 2.71

Debenzah 1.1

Flurant 3.75

Fluorene 1.04

Indypr 3.1

napth 1.29

perylene 1.49

phenant 2.91

Explanatory Notes:

The values entered for each determinand should be an average wet weight concentration from all the samples representing the material to be disposed to sea. They should be entered in the units

stated in the Unit of measurement column in the table below.


Total amount to be dredged (wet tonnes)

mg/kg

Sample ID

Unit of

measurement

pyrene 4.18

THC 5922

PCB28 0.23

PCB52 0.12

PCB101 <0.08

PCB118 <0.08

PCB138 <0.08

PCB153 <0.08

PCB18 0.33

PCB105 <0.08

PCB110 <0.08

PCB128 <0.08

PCB141 <0.08

PCB149 <0.08

PCB151 <0.08

PCB156 <0.08

PCB158 <0.08

PCB170 <0.08

PCB180 <0.08

PCB183 <0.08

PCB187 <0.08

PCB194 <0.08

PCB31 0.24

PCB44 0.09

PCB47 <0.08

PCB49 0.09

PCB66 0.08

ICES7 0.71

AHCH <0.1

BHCH <0.1

GHCH <0.1

DIELDRIN <0.1

HCB <0.1

DDE <0.1

DDT <0.1

TDE 0.1

BDE100 <0.1

BDE138 <0.1

BDE153 <0.1

BDE154 <0.1

BDE17 <0.1

BDE183 <0.1

BDE209 <0.1

BDE28 <0.1

BDE47 <0.1

BDE66 <0.1

BDE85 <0.1

BDE99 <0.1

µg/kg

Comments:

Laboratory Details

Laboratory 1 Details:

LabRefMat Q1

Yes

CompAnal Q2Yes

QAQC Q3

Yes

InterlabCaleb Q4

Yes

InternatCaleb Q5Yes

SpikedSamples Q6Yes

BlindSamples Q7Yes

Ranking Q8

Yes

FracAnal Q9 <63um(metals)

GranMeth Q10

OCMeth Q11

MetExtrType Q12

MethOfDetMetals Q13

PAHExtrType Q14

MethOfDetPAH Q15

OHExtrType Q16

MethOfDetOH Q17

Method of extraction used for poly aromatic hydrocarbon analysis

Method of detection used for poly aromatic hydrocarbons analysis

Method of extraction used for organohalogens inc PCBs, pesticides, flame retardants etc

analysis

Method of detection used for organohalogens inc PCBs, pesticides, flame retardants etc

analysis

Does the laboratory carrying out the analyses undertake periodic comparative analysis of

laboratory reference materials and certified reference materials?

PSA method

Organic Carbon method

Method of extraction used for metal analysis

Method of detection used for metal analysis

Does the laboratory carrying out the analyses undertake periodic participation in national and,

where possible, international laboratory proficiency schemes?

If the answer to questions 4 or 5 is 'Yes' then does the laboratory analyse samples of

substances which are provided by the organisers of the scheme?

If the answer to questions 4 or 5 is 'Yes' then does the laboratory confirm that the composition

of those samples is not disclosed in advance?

If the answer to questions 4 or 5 is 'Yes' then does the laboratory confirm that the results of the

scheme for each participating laboratory are made available to all participating laboratories?

Enter the size fraction that is analysed i.e. Whole or less than 63µm etc.

Explanatory Notes:

Please complete a separate worksheet for each laboratory (e.g. complete 'Laboartory_1' worksheet for 1 laboratory and complete

'Laboartory_2' worksheet for a second laboratory). If there are more than 3 laboratories then please contact MS-LOT.

SOCOTEC

2019

carbonate removal and sulfurous acid/combustion at 800°C/NDIR,

Aquaregia

NMBAQC

Laboratory name:

Year:

ICP-MS

Methanol/DCM solvent extraction with silica clean up and copper clean up stages

GCMS

Does the laboratory carrying out the analyses undertake the analysis of blank samples and

laboratory reference materials with each batch of samples of waste and other material dumped

in the maritime area that is analysed by that laboratory?

Does the laboratory carrying out the analyses undertake the compilation of quality control

charts based upon the data resulting from the analyses of the laboratory reference materials

and certified reference materials, and the use of those quality control charts to monitor

analytical performance in relation to all samples of dumped wastes or other materials?

Does the laboratory carrying out the analyses undertake periodic participation in

interlaboratory comparison exercises, including, where possible, international comparison

exercises?

Ultrasonic acetone/hexane solvent extraction

GCMSMS

OTExtrType Q18

MethOfDetOT Q19

LOD/LOQ Precision (%) Recovery (%)

Hg 0.01 4.2 93

As 0.5 2.7 99

Cd 0.04 3.6 103

Cu 0.5 2.9 105

Pb 0.5 3 98

Zn 2 2.6 102

Cr 0.5 3.1 95

Ni 0.5 3.6 98

TBT 0.001 12.62 96

DBT 0.001 12.62 113

PCB28 0.08 12.56 62

PCB31 0.08 5.3 101

PCB44 0.08 5.7 87

PCB47 0.08 5.7 96

PCB49 0.08 5.2 97

PCB52 0.08 6.999 90

PCB66 0.08 10.7 89

PCB101 0.08 8.43 93

PCB105 0.08 8.6 80

PCB110 0.08 5.2 101

PCB118 0.08 14.61 96

PCB128 0.08 7.6 76

PCB138+163 0.08 12.93 118

PCB141 0.08 7.6 101

PCB149 0.08 6.7 81

PCB151 0.08 7.6 103

PCB153 0.08 7.41 82

PCB156 0.08 8.4 91

PCB158 0.08 7.6 98

PCB170 0.08 6 82

PCB180 0.08 9.85 89

PCB183 0.08 6.2 75

PCB187 0.08 6.6 80

PCB194 0.08 6.5 70

DDE 0.1 8.2 81

DDT 0.1 10.6 100

DDD 0.1 11 113

Dieldrin 0.1 10.8 98

Lindane 0.1 8.5 97

HCB 0.1 2.8 128

BDE17BDE28BDE47BDE66BDE85BDE99

BDE100BDE138BDE153BDE154

Method of extraction used for organotin analysis

mg/kg

µg/kg

derivatisation and solvent extraction

GCMSMethod of detection used for organotin analysis

BDE183BDE209

ACENAPTH 1 6.68 67

ACENAPHY 1 7.74 102

ANTHRACN 1 4.95 70

BAA 1 9.8 71

BAP 1 9.07 61

BBF 1 8.44 87

BENZGHIP 1 13.46 71

BEP 1 7.9 88

BKF 1 8.9 88

C1N 1 8.27 78

C1PHEN 1 N/A 81

C2N 1 N/A 109

C3N 1 N/A 136

CHRYSENE 1 7.87 92

DBENZAH 1 19.23 101

FLUORENE 1 5.25 55

FLUORANT 1 4.36 81

INDPYR 1 17.1 75

NAPTH 1 3.02 62

PERYLENE 1 N/A 62

PHENANT 1 5.41 80

PYRENE 1 4.29 75

THC 100 N/A 107

Documents

Chapter 7 Marine Water and Sediment Quality · 2020-03-02 · Project related 31 January 2020 PB4749-RHD-ZZ-XX-RP-Z-0007 1 7 Marine Water and Sediment Quality 7.1 Introduction 1