cÓs brownfield briefing belfast conference presentation ... · presentation outline: 1. background...

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Case Study: East Tip, Haulbowline Island Remediation Project

Brownfield & Contaminated Land Conference

East Tip, Haulbowline Island, Remediation Project

Cormac Ó Súilleabháin

Conference

11th May 2017, Belfast

Presentation Outline:

1. Background

2. Project Objectives

3. Regulatory Process

4. Public Engagement

5. Detailed Quantitative Risk Assessment

6. Remedial Solution/Current Status


1. Background


Inis Sionnach


1. Background

• Formerly British Naval base

• Original Island 11.5 ha – had increased to 23.5 ha in 1926 with addition of dockyard (1865 ‐ 1926).

• Transferred to Irish State in 1923.

• Steelworks opened in 1939 – Irish Steel Ltd (P)p ( )[open hearth 1942‐72 (35t coal to 70t oil in early 1960s ); EAF 1972‐2001 (35t to 90t in 1981 to 110t with ladle furnace on 1992)]

• Unique site in Irish context

• Process waste dumped on sand spit to east of Naval Dockyard from early 1960s to 2001 creating the East Tip (c. 9ha and c. 650,000m3)


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2001

• Slag (c. 64%), Refractories (c. 14%), Millscale (c.13%), Scrap metal (c. 7%), Sludge (c. 1%), Fluedust (c. 0.1%) and other (c. 1%)

• Mainly non‐hazardous

1. Background


2. Project Objectives

1. Identify and quantify the risks to human health and the environment.

2. Identify and specify the mitigation measures necessary to minimise those


yrisks.

3. Leave a positive legacy for residents of the Lower Harbour.

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2. Proposed End‐Use

East Tip, Haulbowline Island, Remediation Project East Tip, Haulbowline Island, Remediation Project


Key Constraints & Considerations

• Not a greenfield site

• No template ‐ BAT

• Site specific remedial solution

• Unique site in an Irish context

• Marine environment

• Protection of human health & environment

• Conservative approach

• Regulatory framework


3. Regulatory Process• Letter of Formal Notice issued to State inSeptember 2010 re: Infringement 1999/5112and associated judgement of European Court ofJustice (ECJ 494/01)

• CCC requested to facilitate regularisation of site(July 2011 ) i.e. waste licence

• Initial step was to review existing dataset

East Tip Haulbowline Island Remediation Project

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3. Regulatory Process

• Waste Licence Application to EPA

• Application to ABP for planning approval under S181(3) of the Planning and Development Acts 2000‐2013• Development by or on behalf of a Minister, including

development on the foreshore, that is considered urgent in order to preserve, protect or improve the quality of the environment or protect human health and requires an EIS.

• Also having regard to the Provisions of S226 (works on foreshore), S175 (EIS) and S177AE (NIS) i.e. single application

• Foreshore Licence – DECLG

• Detailed Quantitative Risk Assessment key element


4. Public Engagement


5. Detailed Quantitative Risk Assessment

• Project driver

• S‐P‐R model of environmental management:

• Determine risk based upon current site use;

• Determine risk based upon potential future public amenity use;

• Determine risk to groundwater & surface waters;

• Make recommendations (generic) for mitigation.


Geo‐Environmental Investigations

Investigation included:

• Installation of 35 boreholes, excavation of 31 trial pitsand 2 trenches;

• Collection and analysis of 108 waste samples, 34natural strata and 23 leachability testing samples;

• Collection and analysis of 20 offshore marine samples• Collection and analysis of 20 offshore marine samples,23 harbour water samples, 8 shell fish samples;

• 136 groundwater samples, 5 surface water samples(from excavations), 9 foreshore seepage samples;

• 11 ground gas samples and 17 rounds of gasmonitoring.



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Targeted sampling of all waste types.




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Investigation Findings (Contaminants)

• The site is well characterised from a contamination & riskperspective.

• Conditions encountered remain as anticipated based onknown site history:

• Metals associated with steel works: As, Cu, Cd, Cr, Hg, Mn, Ni, PbMetals associated with steel works: As, Cu, Cd, Cr, Hg, Mn, Ni, Pb

• Polyaromatic Hydrocarbons, PCB’s , Dioxins and Furans

• Petroleum Hydrocarbons

• Asbestos – very low quantities identified


Tiered Risk Assessment

• Generic QRA ‐– Solid, leachability and water analysis results compared toGeneric Assessment Criteria (human health commercial andpark land use) and Water Quality Standards (WQS),

– Waste contains various heavy metal compounds atconcentrations that would necessitate Human Health pathway

t f f t l d i ( i l )management for any future land use scenario (capping layer)

• Detailed QRA– Considering contaminant flux from the site and dilution model in the receptor

– Highly conservative model


Conclusions• Site conditions sufficiently well understood to facilitate the

design of a robust solution.• No risks identified for wider community now or in long term.• Potential human health risk for site users in it’s current state.• Potentially leachable contaminants remain in the waste.• Groundwater impacted with heavy metals and hydrocarbons,

and in direct hydraulic continuity with Cork Harbour.• Model predicts limited theoretical impact to near shore waters

(50m) although no measurable impact to water was observed.• Contaminant contribution from erosion and sediment transport

is likely to be more important than dissolved contaminanttransport.

• Effective remediation will be based on containment of materialswithin the East Tip – pathway management using PES with max.permeability of 10‐5m/s.


• Control risk to human health by capping andlandscaping.

• Limit further leachate generation by minimisinginfiltration (i.e. low permeability capping).

• Control dissolved phase contaminant loading intoCork Harbour by decreasing lateral permeability

6. Remedial Solution/Current Status

Cork Harbour by decreasing lateral permeabilityaround the shoreline perimeter of the site (max10‐5 m/s) in conjunction with low permeabilitycapping.

• Address future sediment loading into Cork Harbourby creating erosion protection around the shorelineperimeter.


(a) Planning Consent

• Planning submitted 31st October 2013

• Oral Hearing held by An Bord Pleanála on March 19th

2014

• No objections received

N bli b i i t t f l i

Current Status

• No public submissions at any stage of planning process

• Submissions from prescribed bodies only

• Planning granted 1st May 2014


(b) Waste Licence

• Waste licence application submitted on 14th

November 2013

• Application submitted in accordance with the Waste Management (Licensing) Regulations 2004.

• Similar suite of documents to that submitted with planning application i.e. DQRA, EIS, NIS, Outline p g pp Q , , ,Design etc.

• No objections

• No public submissions

• Waste Licence granted 23th July 2014


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Further information and project updates available at:


www.corkcoco.ie/haulbowline

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