Why is Understanding LNAPLs Important?

Understanding Light Non-Aqueous Phase Liquid (LNAPL) is important for the following reasons:

LNAPL is common problem: several hundred thousand petroleum underground storage tanks (USTs) in the United States.
LNAPL in soil/groundwater serves as continuing source of contamination.
Can have dangerous physical characteristic – e.g., flammable vapors.
Can migrate rapidly in subsurface(vertically and horizontally).
Many LNAPLs are toxic and can cause cancer (e.g., benzene).