Dakota's UVOST product efficiently delineates petroleum, oil, and lubricant (POL) contaminants in the subsurface. All the usual forms of POLs, including; gasoline, diesel fuel, jet fuel, and hydraulic fluids, can be detected via the fluorescence response of their polycyclic aromatic hydrocarbon (PAH) constituents. The fluorescence signal scales proportionally with NAPL concentration. (UVOST struggles to detect high-PAH content NAPLs such as tars, bunkers, etc. - See TarGOST for these 'heavies'). UVOST's LIF technique, in conjunction with direct push deployment, yields a detailed three-dimensional map of the NAPL distribution, in real time - offering a true 'seek and find' adaptive site characterization capability as promoted by U.S. EPA's TRIAD approach.