Authors:
Tage Vikjær Bote | Cowi | Denmark
PhD Per Loll | DMR A/S | Denmark
PhD Thomas Larsen | Orbicon | Denmark
Bjarke Hoffmark | COWI A/S | Denmark
Arne Rokkjær | The Capital Region of Denmark | Denmark
Mads Georg Møller | Orbicon | Denmark
Session 1b: Risk assessment and management (sub theme: Indoor air pollution from soil and groundwater)
Since the mid 90's vapor intrusion has been a major issue in Denmark and today vapor intrusion is a significant part of the efforts to ensure against contaminated sites. Investigation techniques and approaches to locate and determine the amount of vapor intrusion has been developed over the last two decades. This has given us a knowledge and understanding of the mechanisms controlling the vapor intrusion, which are amongst the best in the world. Remediation techniques have been developed and refined to provide greater security against vapor intrusion due to this knowledge.
The aim of the session is to share our knowledge about vapor intrusion including investigation and remediation techniques. Consideration of vapor intrusion vary from country to country due to political and cultural differences. However, differences in the ways vapor intrusion is handled, is also caused by differences in building constructions and climate. Factors that have great importance for processes that controls vapor intrusion. Another aim of the session is therefore to debate this diversity, in order to give both participants and speakers a better understanding of the similarities and differences and the extent to which we can apply knowledge and methods from one country / region to another.
We therefore propose that the open session will consist of both presentations and discussions with the following content:
• Methods for detecting vapor intrusions points, and vapor migration pathways in houses, including different measurements techniques for VOC's, tracer gases, thermography.
• Knowledge of vapor intrusion part ways, including traditional part ways as cracks in the concrete slap, pipe and wire penetrations of the slap, but also sewers, cavity walls etc.
• Different remediation techniques:
o Remediation techniques using passive venting systems. A technique with high sustainability and low operation cost, but do they work?
o Remediation using Hybrid venting system based upon solar and wind power
o Remediation using Geo-membranes
• Monitoring is an important part of the remediation process, both to ensure that desired barrier is obtained but also to develop and refine the remediation techniques.
• Lessons learned.
o We will strive to ensure that all presentations, in addition to providing an academically description of the methods developed, also include also include the topic "lessons learned".
o A short presentation to initiate a discussion on the similarities and differences between countries / regions.
Names of presenters and titles of presentations
• DMR, Per Loll. State of the art studies of vapor intrusions and migration pathways. The presentation includes different measurements techniques, and how to combine the results in risk assessment.
• Orbicon, Thomas H. Larsen. Remediation techniques using passive venting systems.
Passive venting systems are the most frequently used remediation technique against vapor intrusion due to its sustainability, high reliability and low operation cost. There are a variety of passive venting systems, each with their advantages and disadvantages. We present a case study describing the different passive venting systems.
• COWI, Tage V. Bote. Monitoring strategy.
Monitoring sounds like a simple exercise, but to implement a useful monitoring requires careful planning. Monitoring strategy has to be involved already in the design phase of the remediation, and it must fit into the plans for the construction of the building. This is to ensure that any errors or defects in remediation can be rectified as soon as possible in the building process. We present a case study describing the implementation process of the monitoring strategy.
• Orbicon, Bjarke N. Hoffmark. Remediation using Hybrid venting system based upon solar and wind power. The presentation describes a case study where the traditional passive ventilating system is improved but has preserved sustainability, high reliability and low operation cost. One of the disadvantage of passive venting system is that the driven forces is limited by very little pressure differences. Using the hybrid venting system the driven forces is significantly improved.
• The capital region, Arne Rokkjaer. Remediation using Geo-membranes or other remediation techniques. The capital region of Copenhagen is the largest actor in Denmark with respect to initiate actions to reduce or prevent vapor intrusion. As a regional authority they provide guidelines and setting conditions for the building permissions on contaminated sites, but they also finance remediation actions of existing housing. The presentation describes state of the art remediation actions.
• DMR, Per Loll. Lessons learned.
A short presentation to initiate a discussion on the similarities and differences between countries / regions.
Moderators: Per Loll, DMR, Bjarke N. Hoffmar, Orbicon & Tage Vikjær Bote * COWI.
*contactperson: Parallelvej 2, 2800 Lyngby, tvb@cowi.dk.