1. IMS-approach to the The Kempen (Flemish-Dutch border)
Piet Seuntjens, Ludo Diels
VITO, Belgium

2. Kempen
Cd (mg kg-1)

3. Kempen as a megasite Large (km2-scale) contaminated site
Multiple owners, stakeholders and users
Multiple sources, transport and exposure pathways and receptors
Finances are insufficient for complete remediation
Integrated Management Strategy needed

4. Risk based management: risks and measures
Sources
Metal-contaminated soil, ashes, ore dumps, waste dumps
removal, capping, …
Pathways
air: resuspension, deposition (primary vs. secondary), dust
water: soil->groundwater->surface water
biotic transfer: cattle, crops, trees, plants, organisms
screens, …
passive treatment, wetlands, barriers, Sediment traps, …
immobilization, liming, …
Receptors
Humans (playgrounds, houses, drinking water, primary food products)
Ecosystem (surface water, nature, forest)
land use limitations, cultivation advices, land use changes

5. Steps towards risk-based management
Inventory:
Stakeholders
Sources, pathways, and receptors of contamination, GIS-system
Existing and emerging management strategies
Diffuse sources
Point sources
Define data/knowledge needs to establish risk management strategy
Building a management strategy:
Conceptual model Kempen
Common risk assessment “models”, common maps
Define management options: scenario analysis
Communication to stakeholders
Adapt legislation
Long-term monitoring