Expertise: Evaluates the vapor intrusion pathway utilizing state of the art field investigation techniques and fate and transport models; utilizes sophisticated data analysis methods to distinguish vapor intrusion impacts from background indoor air impacts emanating from other sources such as building materials, household cleaning supplies, cigarette smoke, ambient air, or other sources.

Represenative Experience:

Site Investigation: Collected groundwater, soil gas, indoor air, and flux chamber samples to evaluate the potential for indoor air impacts
associated with chlorinated solvents in groundwater under residential and commercial properties.

Database Evaluation: Compiled database of groundwater and indoor air measurements from over 30 corrective action sites across the
United States. Utilized data to understand significance of background indoor air impacts and differences in vapor intrusion between
petroleum hydrocarbons and chlorinated solvents.

Model Development: Developed a mass flux model of transport of volatile chemicals from groundwater to indoor air.

Field Research: Received three-year DoD research grant for a detailed evaluation of vapor intrusion processes at three Air Force bases.

GSI performs comprehensive evaluations to provide
accurate assessments of vapor intrusion.