Vapor Intrusion

NAVIGATING THE EVER-EVOLVING REGULATORY LANDSCAPE

GSI continues to stay upfront on the recent regulatory elements that have had a significant impact on the evaluation and resolution of sites where vapor intrusion is a potential concern.

At properties where volatile organic compounds (VOCs) are present in the subsurface, vapor intrusion (VI) is the pathway with the greatest potential to result in actual human exposure. VI refers to the migration of VOCs from the subsurface to indoor air. Since this exposure pathway was identified at properties in the 1990s, GSI has been an industry leader in the field. Our experts have decades of experience evaluating and mitigating potential VI exposures at new and existing buildings as well as providing strategies for property transaction and development projects. We apply our wealth of experience to develop practical strategies to evaluate and manage VI exposure concerns.

In addition to our experience with residential, commercial, and industrial sites across the U.S., GSI has led research and development efforts to find solutions to VI’s most challenging technical problems including distinguishing indoor chemical sources from VI and understanding sewer preferential pathways. To help advance the state of the science, our research has led to publication of more than 12 peer-reviewed journal articles on VI in the last 10 years alone.

GSI provides our clients with adaptable solutions while maintaining the projects timeline and budget.

Related practice areas include:

FEATURED PROJECTS

Affordable Housing Redevelopment

Carson, California

GSI implemented a remedial design and implementation plan which accounted for site improvements including new utility lines, parking and landscaping areas, main restaurant structure, and drive through areas. The project remained on schedule and on-budget by installing the remediation system concurrently with construction.

Vapor Intrusion Mitigation System

Former Research and Development Facility, Northern California

GSI is actively coordinating the design of a passive vapor intrusion mitigation system (VMS) meeting regulatory agency performance objectives and successfully engaging in ongoing regulatory negotiations to provide a VMS with trailing, low maintenance obligations as a cost-effective solution for the client.

Vapor Intrusion Mitigation System, Former Research and Development Facility, Northern California

GSI is actively coordinating the design of a passive vapor intrusion mitigation system (VMS) meeting regulatory agency performance objectives and successfully engaging in ongoing regulatory negotiations to provide a VMS with trailing, low maintenance obligations as a cost-effective solution for the client.

Methane Vapor Intrusion Source Identification and Mitigation

North Texas

GSI completed a forensic investigation to identify the source of unexpectedly high methane found below a newly-constructed commercial building. The project included methane source identification and mitigation system optimization. As a result of the project, the client was able to complete buildout and proceed with lease of the structure.

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