ABSTRACT: Petroleum hydrocarbons are one of the most common environmental pollutants. Historically the extent of contamination was assumed from the presence and thickness of free product in monitoring wells. From the view of present research is this information valuable, but the issue of identification and evaluation of free product volume is more complex and one must incorporate several important factors. This paper presents current trends of evaluation of LNAPL presence in bedrock, as well as factors influencing its migration and distribution. Identified volume of LNAPL is often over estimated, due to relying on the obsolete “pancake” distribution model and not considering the effect of capillary forces in porous media. In recent research papers a new parameter is presented, connected to LNAPL volume estimation and remediation feasibility studies – LNAPL Transmissivity (Tn). Based on evaluation of information about contamination and geological setting, it should provide more accurate information for planning of remediation activities.