A Holistic Approach to Site Assessment of Former Landfill and - - PowerPoint PPT Presentation

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A Holistic Approach to Site Assessment of Former Landfill and Sustainable Remediation

Jane Oakeshott Montreal SusRem 2016

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Contents

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• Proposed Development
• Sustainability Context
• Site History, SI & GQRA
• Development Options
• DQRA
• Sustainable Remediation Assessment : MCA
• Environment, Social & Economic
• Carbon Footprint
• Conclusions
• Acknowledgements: Don Reid & Alan Thomas

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Introduction (1)

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• Proposed Development
• Intermodal rail freight

exchange

• Large distribution centre

next to key rail and road radials / national arterial routes

• Few suitable sites -

requires sufficient land- take, high level connection & access arrangements, and proximity to the intended market

• Ground conditions

secondary consideration

• Main constraint: fixed

development level

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Introduction (2)

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• Background / Setting for the Assessment of Sustainable

Remediation for this site

• Project &

Sustainability Objectives

• Constraints
• Stakeholders
• Boundaries
• Scope & assessment

criteria

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Sustainable Remediation Framework

ability to influence sustainability

PLANNING (brownfield) REMEDIATION CONSTRUCTION PROJECT DEFINITION REMEDIAL OPTIONS APPRAISAL SITE INVESTIGATION REMEDIATION OPTIMISATION CLIENT OBJECTIVE CLIENT GOAL Community & stakeholder engagement Sustainable Procurement

Setting the remediation specification and strategy Setting the remediation technical approach

RISK ASSESSMENT

• Based on SuRF-UK Framework for Sustainable Remediation 2010
• Risk Based Land Management principles are at the heart of Sustainable

Remediation.

• Helps address two fundamental questions:

i) Is Remediation Really Necessary? ii) How Much Remediation Is Necessary?

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Sustainable Management Practices: Site Investigation

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• Former Landfills &

Regulatory Context

• Site Investigation &

GQRA

• Initial Engagement

Regulators

• Findings:
• Extent & nature landfill

deposits

• Generic QRA:
• Human Health
• Controlled Waters
• Gas

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Development Option (1)

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• Initial Proposal
• Cut-and-Fill under voluntary scheme, CL:AIRE Waste

Code of Practice (CoP) adopted in England & Wales

• Details CoP

(Certainty, Quantity, Suitability, Protection Human Health & Environment)

• Liaison regulators
• Initial stance
• CoP not appropriate,
• Permitting regime inflexible - removal landfill
• First Option: excavate & replace all waste material…..
• Further liaison – CoP might be applicable if supported by

DQRA

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SMP: Detailed Quantitative Risk Assessment

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• Brief Details:
• Conceptual Model:

S-P-R

• Definition source

term

• Finding / agreeing

compliance point / receptor with regulator…

• Results
• Critical to eventual

agreement with regulator….

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Development Options (2 & 3)

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• RA: Sign off contaminated land/brownfield officers,

resistance still from permitting officers regarding CoP

• Second Option:

Cut material not suitable for re-use without treatment /containment - not practicable - replace

• But then…… Update of Permitting Regime
• New Recovery Permit

(benefit, suitable, minimum quantity, substitute non-waste, appropriate standards: RA & engineering)

• Application to both onsite material redistribution and

import

• Third Option:

Cut-and-Fill & Import Selected Former Waste Material

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Development Options: Summary

10 1st Option: Excavation & replace all landfill material, latter to include import to make up site levels 2nd Option: Replace all cut landfill material & replace, latter to include import to make up site levels 3rd Option: Cut-and-fill with screening for re-use, import of recovered waste to make up site levels

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Sustainable Remediation Assessment: MCA

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• ERM developed multi-criteria/

attribute analysis based on CL:AIRE SuRF-UK indicators for 3 categories:

• Environment
• Social
• Economic
• First step: relative weighting of

the above categories and their sub-categories

• Second step: assessment of the

remediation development

• ptions to determine relative

ranking

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MCA: Environment

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• Carbon footprinting undertaken to support assessment of impact on air

emissions

Environment Sustainability Criteria Relative Weighting Relative Assessment Option 1 Option 2 Option3 Impact on water 3 2 1 1 Impact on soil 2 1 Impact on air emissions - climate change 3

• 1

Impact on air emissions - local 4

• 4
• 3
• 1

Impact on ecology 1 Natural resource use and waste generation 5

• 5
• 3

2 Net Environmental Benefit

• 36
• 15

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Carbon Footprint System Boundaries

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Import Fill Material Landfill Excavation & Placement of Material

• n-site

Transport Transport Off-site Landfill Fuels Excavated waste Imported material Materials & energy used

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Carbon Footprint

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0 ¡ 10,000 ¡ 20,000 ¡ 30,000 ¡ 40,000 ¡ 50,000 ¡ 60,000 ¡ Op,on ¡1 ¡ Op,on ¡2 ¡ Op,on ¡3 ¡ t ¡CO2-­‑eq ¡ Excava,on ¡works ¡ Imported ¡Material ¡Transport ¡ Material ¡to ¡Landfill ¡Transport ¡

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MCA: Social

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• Stakeholders – local community important but regulator most influential

Social Sustainability Criteria Relative Weighting Relative Assessment Option 1 Option 2 Option3 Human health - chronic & acute risks 3

• 2
• 1

Ethics and equality 1 Neighbourhood & locality 4

• 5
• 2
• 1

Communities and community involvement 2 1 1 1 Uncertainty & evidence 4

• 4
• 2

2 Net Social Benefit

• 40
• 17

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MCA: Economic

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Economic Sustainability Criteria Relative Weighting Relative Assessment Option 1 Option 2 Option3 Direct economic costs & benefits 5

• 5
• 2

2 Indirect economic costs & benefits 3

• 3
• 1

1 Employment opportunities & human capital 2 1 1 1 Induced economic costs and benefits 1 1 1 1 Project lifespan & flexibility 3 3 2 1 Net Economic Benefit

• 22
• 4

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MCA: Summary

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• Environment, Social & Economic Net Benefit
• Sustainability Net Benefit
• ­‑50 ¡
• ­‑40 ¡
• ­‑30 ¡
• ­‑20 ¡
• ­‑10 ¡

0 ¡ 10 ¡ 20 ¡ 30 ¡ Op,on ¡1 ¡ Op,on ¡2 ¡ ¡ Op,on ¡3 ¡

Net ¡environmental ¡benefit ¡ Net ¡social ¡benefit ¡ Net ¡economic ¡benefit ¡

• ­‑120 ¡
• ­‑100 ¡
• ­‑80 ¡
• ­‑60 ¡
• ­‑40 ¡
• ­‑20 ¡

0 ¡ 20 ¡ 40 ¡ 60 ¡ Op,on ¡1 ¡ Op,on ¡2 ¡ ¡ Op,on ¡3 ¡

Overall ¡net-­‑benefit ¡(Sustainability) ¡

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MCA: sensitivity

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• Option 3 - economic criteria >50% of overall evaluation,
• Removal of economic criteria (not prime concern of regulator):

significant reduction of ‘score’ and differential with option 2

• Relative net-benefit

(minus economic criteria)

• Relative net-benefit

Economic ¡ ¡ criteria ¡ ¡22% ¡ Economic ¡ ¡ criteria ¡ ¡11% ¡ Economic ¡ ¡ criteria ¡ ¡56% ¡

• ­‑120 ¡
• ­‑100 ¡
• ­‑80 ¡
• ­‑60 ¡
• ­‑40 ¡
• ­‑20 ¡

0 ¡ 20 ¡ 40 ¡ 60 ¡ Op,on ¡1 ¡ Op,on ¡2 ¡ ¡ Op,on ¡3 ¡

Overall ¡social ¡& ¡environmental-­‑benefit ¡(Sustainability) ¡

• ­‑120 ¡
• ­‑100 ¡
• ­‑80 ¡
• ­‑60 ¡
• ­‑40 ¡
• ­‑20 ¡

0 ¡ 20 ¡ 40 ¡ 60 ¡ Op,on ¡1 ¡ Op,on ¡2 ¡ ¡ Op,on ¡3 ¡

Overall ¡net-­‑benefit ¡(Sustainability) ¡

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Conclusions

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• Regulatory context & continued engagement with regulators

critical

• Risk Assessment underpinned eventual option and

regulatory acceptance

• Sustainability case strengthened by metrics – sustainability

assessment multi-criteria analysis & carbon footprinting