Develop the best approach to navigate and eliminate VI risk exposures

Vapor Intrusion (VI) is the migration of contaminant (volatile organic compounds, methane, and/or radon) into building structures from the subsurface. Over the years VI assessment, regulatory guidance and requirements, and mitigation has evolved at a rapid pace. Determining the correct approach for your site is critical. Do you need mitigation? If so, what is required? What is needed? GES has a nationwide team to assist you with your VI assessment, exposure risk analysis, and if necessary, VI mitigation design.

VI Assessment/Evaluation

No two sites are exactly alike and determining the correct VI assessment approach will be based on a site-specific evaluation. At GES, we believe that the site evaluation must reflect a holistic approach to develop the appropriate site-specific solution. GES works with properties zoned as industrial, commercial, residential, retail, and institutional; brownfields and redevelopments; and new and existing construction. Understanding the conceptual model, local and state regulations and requirements, and development goals, are critical to providing the correct assessment for your property.        

summa canister

Specialized steel canisters, called SUMMA  
canisters, are often used to collect vapor samples  
for laboratory analysis during VI assessment / evaluation











VI Mitigation

There are various types and methods of VI mitigation. GES will review the assessment data, construction plans, development goals, and regulatory guidance and requirements to develop the best and most practical VI mitigation approach for each site. Our team of skilled engineers and scientists will be dedicated to the initial design, installation oversight, and any ongoing operations, maintenance, and monitoring (OM&M) of the system.

Active blower

Mitigation systems can range from a  
passive venting system, to contaminant  
sub-slab vapor barriers, to fully active  
mitigation systems like the blower  
pictured above