Themes:

1. Restoration
2. New functions of the subsurface
3. Sustainable management of land use and the subsurface
4. Management of contamination at regional scale

Subthemes and keywords per theme:

 A Restoration

 A1 Environmental footprint

• Green remediation
• Reduction of environmental footprint of remediation activities
• Natural soil quality regulation in wetlands
• Cradle to cradle
• Soil and sediments as recourses
• Decision support tools for choosing sustainable solutions (e.g. LCA)

A2 Site investigation: Monitoring & Screening

• Strategies
• Heterogeneity and "hot spots"
• Physical and chemical measurements and analytics
• Geotechnical and geohydrological investigations
• Techniques for forensic soil investigation
• Non to low invasive technologies

 A3 Remediation Concepts & Technologies

• Isolation: physical, geohydrological
• Stabilization / solidification / immobilization
• In situ treatment: physical, biological and chemical
• Natural attenuation
• Ecological engineering
• Management of excavated soil and dredged sediments
• Costs, communication and acceptance
• Combination of methods

A4 Complete cases of restoration of sites

• Mining areas
• Harbours
• Brownfields
• Landfills
• Complex (former) industrial sites
• (Former) military sites

 A5 Sediment management and remediation

• Sediment remediation and management in rivers and lakes
• Impact of sediment quality on soil and water quality
• Technologies, concepts and policy
• Risk-based approach at catchment scale
• Large scale application of sediment remediation methods

B New functions of the subsurface

• Cold/heat storage
• Geothermal energy
• CO₂-storage
• Subsurface waste storage
• Carbon sink management
• Water storage management
• Combined and new functions

C Sustainable management of the subsurface

C1 Policies on soil-water systems 

• Governmental and industrial policies
• International strategy / policy
• Science-policy interfacing
• Prevention of detoriation
• Soil quality objectives, target values and policy goals
• Policy evaluation, social and economic aspects
• Stakeholder participation
• Integration/harmonisation of policies

 C2 Functions & Values of soil-water systems

• Multi-functional use of the subsurface
• Soil quality requirements
• Impact of subsurface functions on soil and groundwater
• Geo-ecology, geo-diversity, biodiversity, soil genomics
• Ecological status and use of the subsurface
• The valorization and appreciation of the subsurface
• Changes in land use, soil use and climate change
• From the subsurface to the food chain
• Sustainable land use and ecosystem services

 C3 Fate, Risks & Impacts of contaminants

• Ecological Risk Assessment (ERA)
• Exposure modelling and pathways
• Speciation, bioavailability, leaching
• Biodegradation products/metabolites
• Target and trigger values
• Quality assurance and standards
• Bioassays, target organisms
• Dealing with uncertainties
• Modelling

D Management of contamination at the regional scale

• Concepts for regional integrated soil and water management
• Regional groundwater quality
• Policies: national and international
• Industrial megasites
• Regional soil and water quality in urban areas
• Changes in water cycle (sea level rise and climate change)
• Urban areas