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Vapor Intrusion Assessment and Mitigation

When volatile chemical vapors migrate to the indoor air of overlying or adjacent buildings, the condition is called “vapor intrusion.” The associated vapor exposures can result in health and safety risks to the occupants, and liabilities for owners. The science behind vapor intrusion has been evolving rapidly, and we have pioneered innovative technological approaches to investigating and rapidly resolving vapor intrusion challenges.

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Vapor intrusion is rapidly becoming a key issue of concern for owners and prospective buyers of commercial and industrial properties – especially those with historical dry cleaning operations. The effect of changing regulatory standards and increasing enforcement has resulted in increased liabilities associated with this legacy contamination issue. Our due diligence team routinely addresses vapor intrusion issues during time-critical property transactions. When intrusive investigations are required, we can rapidly respond with assessment strategies appropriate to our clients' objectives. While many of our competitors apply limited testing approaches combined with risk modeling to “argue out” of the problem, we have found that vapor intrusion is an issue that can be effectively resolved with rigorous and defendable data that accurately assess exposure conditions. We also maintain that most vapor intrusion sites can be cost-effectively mitigated through engineering controls, or by using active or passive mitigation systems.

Our vapor intrusion expertise includes assessment of all subsurface media, sampling of indoor and outdoor air quality, and use of diagnostic tools such as temporal-spatial (continuous real-time) sampling approaches that reveal patterns that provide more certainty about exposure risk and source identification. We also offer permitting, design, and implementation of mitigation and remediation measures as needed. Where appropriate, we use institutional and engineering controls to resolve vapor intrusion issues.

We actively install:

  • Soil vapor extraction systems
  • Subslab depressurization systems
  • Active ventilation systems
  • Passive ventilation systems
  • HVAC upgrades
  • Vapor barriers
  • Aerated floor systems

We work with regulators, private- and public-sector clients, attorneys, lenders, developers, and insurance carriers to evaluate vapor intrusion conditions, assess sources, and develop innovative solutions that meet the needs of all stakeholders.


Project Experience

creative cleanup at former dry cleaner

Creative Cleanup at Former Dry Cleaner

Farallon was retained by an insurance company representing the previous owner of this former dry...

managing risks in retail center

Managing Risks in Retail Center

Farallon was engaged to address vapor intrusion concerns at a retail facility formerly used by a dry...

Farallon VOC Monitoring Probe

Farallon Volatile Organic Compound Monitoring Probe

Farallon was retained by a property owner to install the patented Farallon VOC Monitoring Probe and...

Manufacturing Plant

Manufacturing Plant

Farallon was contracted for technical support by an insurance carrier covering the investigation and...

Protection from Methane Gas Infiltration

Protection from Methane Gas Infiltration

Farallon designed a methane gas mitigation system to protect a large retail warehouse located over...

TCE Release Triggers Vapor Intrusion Investigations, Mitigation Measures

Trichloroethene Release Triggers Vapor Intrusion Investigations, Mitigation Measures

Urban areas across the United States have long been centers of industry, and often become the focus of...

tracking down an elusive source of contamination

Tracking Down Elusive Source of Contamination

After Farallon successfully completed cleanup of a former dry cleaning facility on a client’s...

vapor mitigation industrial property

Vapor Mitigation – Industrial Facility

Elevated concentrations of trichloroethene (TCE) were identified in shallow groundwater under the...


Meet Our Team

headshot of Brian Kahl Brian Kahl Senior Geologist

Brian is a California Professional Geologist with more than 30 years of experience in environmental compliance, property due diligence, site assessment, and remediation. He has extensive experience designing and...

headshot of Henry Pietropaoli Henry Pietropaoli Senior Geologist

Henry has over 30 years of experience conducting environmental site investigations, endangerment assessments, contaminant remediation, hazardous waste management, construction, and real estate development...

headshot of Jeff Kaspar Jeffrey Kaspar Principal Geologist

Jeff’s 28 years of experience allow him to anticipate client and project needs. His emphasis on developing effective working relationships with clients, regulators, vendors, and peers ensures that clients’...

headshot of Mark Havighorst Mark Havighorst Principal Engineer, Portland Office Manager

Mark has 20 years of experience providing consulting services for projects involving property acquisition, cleanup, redevelopment, and compliance. He has worked with clients in wood products, high-tech,...

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