case study remediation in neath port talbot · 2017. 7. 18. · 5/26/2011 1 case study remediation...
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Case Study
Remediation in Neath Port TalbotSt Modwen Developments
Richard Mitchener
Mike Poland
Remediation Approach
Key sites in former BP portfolio in South Wales
● Management of BP Legacy
– “Suitable for use” not definable at present
– Boundary protection
– Mass reduction => MNA can occur
•Perception Management
•Interaction of site specific factors on:
Coed Darcy
Baglan
Transit
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•Former Llandarcy Oil Refinery
•Junction 43 M4
•420 hectares
•Coed D’Arcy Business Park
•West and south – Crymlyn Bog
Coed Darcy
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Llandarcy Transformation…
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Environmental Risk Management
Historical land-use that has resulted in the release of contamination to the ground and groundwater.
The principal contaminants:
● Petroleum hydrocarbons
● Chlorinated Solvents
● Metals and Asbestos
● Varied spatial distribution
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Conceptual Model
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Tip Restoration
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RAP St Modwen
Development RemediationSt Modwen
Preventative MeasuresHousing Developer
StatutoryDirectional
Boundaries & Hot spotsNon Prosecution
RBSLNew RBSL
Development monitor
Vapour BarriersPassive Venting
Monitor
7-8Years
Final Housein 2026?
Remediation Process/Management
Catchment
Management
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Crymlyn Bog Lagoon
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Transit
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Transit - Masterplan
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Transit - Remediation
Dune Complex to Chemical Works
KenfigNNR/SAC/SSSI
CrymlynBurrows SSSI
The site
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Dune Complex to Chemical Works
Site developed progressively from 1960s
Sand dunes levelled
Slag form nearby steel/ironworks imported
Maximum extent/operation in late 70s, wind down and demolition in 80s and 90s
Last facility removed in 2005
Today
Transit Site & CrymlynBurrows
GE Power Station Baglan
Energy ParkIntertissue
Sandifields
Ragwormfarm
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Sources?
Ground Investigation
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Geology
Hydrogeology
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Microbial Studies
How do you demonstrate MNA?
Aim: to get definitive proof that
● The right microbes are there
– Cultures, gene counts using qPCR
● The microbes are doing what they are supposed to
– Baited traps using C-13-labeled contaminant
● C-13 ends up mineralised and in the biomass.
● Benzene and phenol both used.
Risk Assessment – Human health
Key issues:
● Who uses the beach?
● How much do they use it?
● How do they come into contact with contamination?
Get real data!
● CCTV recording of beach
● Dog walkers main users, duration can be estimated
● Loads of monitoring to understand exposure
– Contaminated water close to low tide
Seepage zone
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Risk Assessment – Controlled Waters
Styrene areas key remediation objective
● Aquifer properties well known
– Site testing, CSIRO model
– MNA occurrence being demonstrated
– Infiltration high – flushing
● Declining source appropriate?
– But check equations carefully
– Decline of soil source or just assume that one pore volume of contamination
The Future