Pollutants in contaminated soil or groundwater migrate into the property when volatile organic compounds (VOCs) have high vapor pressure and low water solubility, this process is known as vapor intrusion.
If VOCs migrate from surface soils into surroundsing buildings, this can negatively impact the indoor air quality and cause health issues to the occupants. In many states, vapor intrusion can even represent a significant liability risk for building owners.
Unlike home radon, which occurs naturally, VOCs are manmade and are used to manufacture fuels, cleaners, paints, medication, and refrigerants. VOCs are also present in industrial solvents, paint thinners, cleaning fluids like tetrachloroethene (TCE), oxygenates, and chlorination in water treatment systems.
VOCs enter the soil during accidents or industrial activities. Once the soil is contaminated and buildings are constructed on top, there is a risk of hazardous vapor intrusion.
Since vapor intrusion is caused by contaminated soil, the Environmental Protection Agency (EPA) has done extensive research into how property owners can protect their buildings. One of the recommendations is to install a radon mitigation system, which can also remove soil vapors from below the foundation before they enter a building.
That is why OES provides several vapor intrusion mitigation options that address all kinds of contamination and foundation types:
OES can also install vapor pins for diagnostic and annual maintenance. The vapor pin is a reusable sub-slab soil gas sampling device constructed of a single piece of metal. It has a single-piece design, along with a silicon sleeve to eliminate potential leak points. It provides a sealable measurement point for the annual maintenance of the system.