Vapor Intrusion (VI) is defined as the migration of volatile chemicals from the subsurface into overlying buildings through subsurface soils or preferential pathways (such as underground utilities).  The presence of volatile compounds in soil or ground water offers the potential for chemical vapors to migrate through subsurface soils and along preferential pathways, potentially impacting indoor air (IA) quality of affected buildings.  TEM is able to monitor air quality as well as design and install the systems that mitigate (remove) the contaminants.