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Technology-Based Solutions for the Environment


Vapor Intrusion

Vapor-Intrusion-Problem_Revised-web Vapor Intrusion

An illustration of vapor intrusion into an existing structure through cracks and penetrations in the concrete slab.

What Is Vapor Intrusion?

Vapor intrusion occurs when volatile chemicals from contaminated groundwater and/or soil is present below a building. These chemicals can produce vapors that migrate through the subsurface and into indoor air spaces.

In some cases, the vapors can accumulate within the building and increase to levels that may pose a health and safety risk. According to the EPA, testing for vapor intrusion can be challenging due to the potential presence of some of the very same chemicals within the building– therefore making it challenging to determine the source of chemical emission.

Vapor Intrusion Mitigation Techniques

When mitigating vapor intrusion, there are a number of viable techniques which differ in both their approach and long-term effectiveness, These approaches include

  • Source Remediation – removing the actual contaminated soil/groundwater will eventually eliminate  vapor intrusion
  • Vapor Intrusion Barriers – installing a physical, chemical resistant barrier material like Geo-Seal® or Retro-Coat to seal off exposure pathways. The use of a vapor collection system can be used in conjunction to alleviate the buildup of contaminated vapors underneath the building.
  • Ventilation Systems – installing a ventilation and exhaust system to remove the contaminated air from within or beneath the building. Forced or mechanical ventilation may be accomplished by using a fan to blow air into or out of the building.

 Land Science Technologies

Land Science Technologies (LST)® is dedicated to developing and providing advanced technologies for sustainable land development. A goal of LST is to provide innovative and technically sound development solutions for under-utilized environmentally impaired properties, commonly referred to as Brownfields. LST’s cost-effective, industry leading technologies offer engineering firms and real estate developers solutions to issues facing the development of Brownfields today.

Land Science Technologies offers three chemical resistant technologies to mitigate vapor intrusion risks.

Geo-Seal is a composite system that creates the ideal blend between constructability and chemical resistance by using both high density polyethylene (HDPE) and spray applied asphalt latex.

The Retro-Coat Vapor Intrusion Coating System is a complete product line that consists of chemically resistant materials to properly protect existing structures from the threat of contaminant vapor intrusion.

Vapor-Vent is a low profile vent system that can be used in lieu of slotted PVC pipe. The speed of installation and the proximity of the vent to the barrier provide cost savings and performance benefits compared to other technologies.