A non-aqueous phase liquid with a specific gravity less than 1.0. Because the specific gravity of water is 1.0, most LNAPLs float on top of the water table. Most common petroleum hydrocarbon fuels and lubricating oils are LNAPLs. Acronym: LNAPL. Non-Aqueous: phase liquid Contaminants that remain undiluted as the original bulk liquid in the subsurface, e.g., spilled oil. Water Table: The level of ground water