Does sustainable remediation passes on risks and burdens to future - - PowerPoint PPT Presentation

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Does sustainable remediation passes on risks and burdens to future - - PowerPoint PPT Presentation

Oct 04, 2022 177 likes •418 views

Does sustainable remediation passes on risks and burdens to future generations? 4th International Conference on Sustainable Remediation April 26 th , 2016 - Montral Griet Van Gestel OVAM The image cannot be displayed. Your computer may

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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 26th, 2016 - Montréal

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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
  • 5. persistence and evolution (mobility)

3 3

  • 6. impact on uses of the site (advices and restrictions on land use)

3

  • 7. impact on surrounding areas (of contamination in groundwater)
  • 8. impact on costs for excavation

1 7

  • 9. impact on costs for groundwater pumping
  • 10. benefits of integration of redevelopment & residual contamination
  • 5

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
  • 5. persistence and evolution (mobility)

3 3

  • 6. impact on uses of the site (advices and restrictions on land use)

3

  • 7. impact on surrounding areas (of contamination in groundwater)
  • 8. impact on costs for excavation

1 7

  • 9. impact on costs for groundwater pumping
  • 10. benefits of integration of redevelopment & residual contamination
  • 5

Total step B 4 18 Final score (Step A X step B) 4 18

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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

  • f Flanders

Stationsstraat 110 2800 Mechelen, Belgium T: 015 284 284 F: 015 203 275 www.ovam.be info@ovam.be

griet.van.gestel@ovam.be johan.ceenaeme@ovam.be peter.van.den.bossche@witteveenbos.co m