Defined as the area from 3 – 5 feet above the ground, lower if small children are present. Indoor Air samples should be taken from this zone to insure that they are representative of the air being breathed in the building.
An acronym that stands for "Benzene, Toluene, Ethylbenzene and Xylene." These compounds are major components of gasoline and are commonly used to indicate the presence of gasoline contamination. BTEX readily biodegrades in soil.
These include chemicals such as PCE (also know by its chemical name tetrachloroethene) and TCE (also known by its chemical name trichloroethene) that are commonly used in dry cleaning and industrial operations. These chemicals can breakdown into others which may also be of concern for vapor intrusion. They do not readily biodegrade in subsurface soil and may require active remediation to remove.
An air sample collected immediately beneath a home or building with a basement foundation and/or a slab-on-grade. Sub-slabs are collected to determine the concentration of chemicals in the soil vapor beneath a home or building because these chemicals may enter the building.
A mechanical device(s) that applies a low amount of suction immediately below the foundation or the occupied space of the building and collects soil vapors which are then vented to the outside. For more information on how these systems operate, please see the IDEM Web page "How Do You Get Radon Out of a Building?"