Soil contamination has become a worldwide problem, posing a serious threat to human health of residents living upon those contaminated sites. The accidental release of volatile organic compounds (VOCs) into the subsurface may cause vapor intrusion (VI), a process by which vapors of petroleum chemicals migrate from subsurface to overlying buildings.The resulting air quality problem from these vapors can pose potential threats to human health.

Here we present some risk assessment tools for petroleum vapor intrusion at leaking underground storage tank sites. These tools are based on analytical mathematical models simulating coupled hydrocarbon and oxygen soil gas transport with an oxygen limited biodegradation.

Furtmore, we present a chlorinated vapor intrusion tool (CVI2D) that can simulate two-dimensional soil contaminant gas concentration profiles in heterogeneous soils, such as are encountered in layered soil scenarios or those in which vertical soil moisture content variations are important.