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Griet Van Gestel – OVAM Does sustainable remediation passes on risks and burdens to future generations? 4th International Conference on Sustainable Remediation April 26 th , 2016 - Montréal
Griet Van Gestel – OVAM
Does sustainable remediation passes on risks and burdens to future generations? 4th International Conference on Sustainable Remediation April 26th, 2016 - Montréal
Introduction
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How much soil/groundwater contamination can be left behind?
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How do we deal with it in Flanders?
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How do we deal with it in Flanders?
1. Information on soil and groundwater contamination 2. Evaluation of sustainability of residual contamination
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1. Information on soil and
groundwater quality will be expanded with
information on possible land uses
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Present legislation: soil certificate and database
A soil certificate is delivered whenever a piece of land is sold Database containing data on soil and groundwater quality:
‘land information register’
Database is supplied by soil investigation reports
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Need for improvement
New evolutions emphases stakeholder involvement Rethink: Which information, and how will it be represented? Data management systems of OVAM are screened
also quality standards for soil investigation reports
focus on residual contamination
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Two improvements proposed
1. Information given in reports will be expanded with consequences when soil will be excavated, with consequences for risks when land uses are
changed. 2. Information will be represented in a visually clear and appealing
format
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Usage information
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Code Action Risks / impacts Measures
GI 1 Excavation of soil Direct exposure e.g. soil removal and treatment
GI 2 Excavation of soil for infrastructure Direct exposure e.g. soil removal and treatment
GI 3 Drainage for infrastructure Spreading of contamination e.g. installation of water purification
GI 4 Removal of pavement Direct exposure ……
GI 5 Vegetable garden Exposure by consumption of vegetables
……
GI 6 Pumping and use of groundwater Exposure (dermal and oral) new risk evaluation
GI 7 Redevelopment with change of use Risks due to change of land use new risk evaluation
GI 8 …… …….
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2. Sustainability
evaluation of residual contamination is integrated in a Sustainability
Assessment Tool
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Cfr. Presentation by Johan Ceenaeme and Peter Van den Bossche in stream 1B at 2:30pm
‘Sustainability Assessment Tool of Soil Remediation and Redevelopment Projects’
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Sustainability of residual contamination is related to
(1) the potential for redevelopment
(2) locational factors & properties of residual contamination
Approach in two steps:
Step A (potential for redevelopment) Step B (properties of residual contamination)
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Approach in two steps:
Step A (potential for redevelopment) 1. external decisions leading to land use changes (in next 100 years)
2. intrinsical factors (in the next 100 years) Step B (properties of residual contamination) 3. depth soil contamination 4. depth of groundwater contamination 5. persistence and evolution (mobility) 6. impact on uses of the site (advices and restrictions on land use) 7. impact on surrounding areas (of contamination in groundwater) 8. impact on costs for excavation 9. impact on costs for groundwater pumping 10. benefits of integration of redevelopment & residual contamination
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Case: Forges de Clabecq – coking plant
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Case: Forges de Clabecq – coking plant
Soil contamination: mineral oil, HM, PAH, BTEX, cyanides Two options : 1. Remediation integrated in the redevelopment : including
residential and recreational area
2. Remediation as required by regulations
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Criterion Option 1 Option 2 Step A 1. external decisions leading to land use changes (in next 100 years) 0.5 0.5
2. intrinsical factors (in the next 100 years) 0.5 0.5
Total step A 1 1 Step B 3. depth soil contamination 5 5
4. depth of groundwater contamination 0 0
5. persistence and evolution (mobility) 3 3
6. impact on uses of the site (advices and restrictions on land use) 0 3
7. impact on surrounding areas (of contamination in groundwater) 0 0
8. impact on costs for excavation 1 7
9. impact on costs for groundwater pumping 0 0
10. benefits of integration of redevelopment & residual contamination -5 0
Total step B 4 18 Final score (Step A X step B) 4 18
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Criterion Option 1 Option 2 Step A 1. external decisions leading to land use changes (in next 100 years) 0.5 0.5
2. intrinsical factors (in the next 100 years) 0.5 0.5
Total step A 1 1 Step B 3. depth soil contamination 5 5
4. depth of groundwater contamination 0 0
5. persistence and evolution (mobility) 3 3
6. impact on uses of the site (advices and restrictions on land use) 0 3
7. impact on surrounding areas (of contamination in groundwater) 0 0
8. impact on costs for excavation 1 7
9. impact on costs for groundwater pumping 0 0
10. benefits of integration of redevelopment & residual contamination -5 0
Total step B 4 18 Final score (Step A X step B) 4 18
Evaluation
Score: < 5 sustainable
Score: > 10 not sustainable
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Conclusions
Providing more information on residual contamination in soil and groundwater in a clear and visually appealing format contributes to sustainable remediation.
The evaluation of sustainability of residual contamination in soil and groundwater should be part of a sustainable remediation assessment.
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Thanks for your attention Are there any questions?
Government of Flanders Public Waste Agency of Flanders Stationsstraat 110 2800 Mechelen, Belgium T: 015 284 284 F: 015 203 275 www.ovam.be [email protected]
