Relatively little is known about the processes controlling the fate and transport of the many toxic compounds associated with industrial wastes, and even less is known about how various inorganic and organic compounds interact once havi.ng entered the groundwater system. A more thorough understanding of the processes affecting contaminants in the subsurface is needed to assess future problems of contamination and to effectively contain and clean up contaminated ground waters. Analysis and selection of appropriate and cost-effective remedial measures to contain and restore contaminated ground water reJ.ies on a thorough understanding of the many •factors that affect the fate, transport, and transformation of contaminants once having entered an aquifer. To improve understanding of these factors, the U.S. Geological Survey, Office of Hazardous Waste Hydrology, is conducting three major research demonstration efforts addressing hazardous waste contamination of ground water. These national interdisciplinary field studies have developed important applied, developmental, and theoretical research findings which have expanded our knowledge of groundwater contamination transport processes. This series of technical papers presents the research conducted at a creosote works site in Pensacola, Florida. The papers were originally presented at a Toxic Waste-GroundWater Contamination Program symposium in Tucson, Arizona, in March 1984.