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Model assessment of reductive dechlorination as a remediation technology for contaminant sources in fractured clay: Case studies

Contents

Preface

1 Introduction

• 1.1 Background
• 1.2 Project description

2 Modeling and remediation objectives

• 2.1 Aim of modeling
• 2.2 Remedial objectives
  • 2.2.1 Absolute objectives and functional objectives
  • 2.2.2 Remedial objectives at Vadsbyvej
  • 2.2.3 Remedial objectives at Gl. Kongevej
  • 2.2.4 Remedial objectives at Sortebrovej

3 Modeling tool

• 3.1 Further development of modeling tool
• 3.2 Modeling scenarios

4 Vadsbyvej

• 4.1 Characterization of contamination source
• 4.2 Geological characterization – Fracture distribution
• 4.3 Hydrogeological characterization
• 4.4 Model configurations and scenarios
• 4.5 Modeling results
  • 4.5.1 Model parameters
  • 4.5.2 Hotspot 2
  • 4.5.3 Hotspot 1
  • 4.5.4 Concentration in underlying sandy aquifer
  • 4.5.5 Comparison with field data
  • 4.5.6 Comparison with remediation objectives
• 4.6 Sensitivity analysis on parameters
  • 4.6.1 Sensitivity analysis for the baseline scenario
  • 4.6.2 Sensitivity analysis for remediation C (degradation in the whole system)

5 Gl. Kongevej

• 5.1 Characterization of the contaminant source
• 5.2 Geological characterization – Fractures distribution
• 5.3 Hydrogeological characterization
• 5.4 Enhanced reductive dechlorination
• 5.5 Model configuration and scenarios
• 5.6 Model results
  • 5.6.1 Model parameters
  • 5.6.2 Mass removal and contaminant flux in the source zone
  • 5.6.3 Concentration in the regional chalk aquifer
  • 5.6.4 Comparison with field data
  • 5.6.5 Comparison with remediation objectives

6 Sortebrovej

• 6.1 Characterization of contamination source
• 6.2 Hydrogeological characterization
• 6.3 Use of EPM model
• 6.4 Enhanced reductive dechlorination
• 6.5 Model configuration and scenarios
• 6.6 Model results
  • 6.6.1 Model parameters
  • 6.6.2 Mass removal and contaminant flux in the source zone
  • 6.6.3 Concentration in the underlying sandy aquifer
  • 6.6.4 Concentration in the regional sandy aquifer
  • 6.6.5 Comparison with remediation criteria

7 Discussion of results

• 7.1 Comparison between the sites
• 7.2 Recommendations for definition of remediation criteria
• 7.3 Recommendations for field investigations prior to and during remediation
• 7.4 Recommendations for use of reductive anaerobic dechlorination
• 7.5 Recommendations for improving modeling tool

List of references

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Version 1.0 July 2009, © Danish Environmental Protection Agency