Gasoline is a complex mixture of aliphatic, aromatic and alicyclic hydrocarbons. In addition, such additives as organometallic compounds, alcohols, organohalide compounds and phosphates may be present, depending on the manufacturer. The so-called BTX compounds (benzene, toluene, and o-, m-, and p-xylene) are, however, aromatic compounds which appear to be ubiquitous to all gasolines, regardless of maker. The mathematical modeling of gasoline migration in the subsurface region is quite difficult as gasoline is not completely miscible in water. The BTX compounds are among the most water soluble of the gasoline components, thus, their potential for transport in a groundwater aquifer system is great. This paper presents and discusses the results of a study conducted to examine the transport and fate of a BTX mixture in flow through soil column leaching studies employing material from a New Jersey aquifer.