This book identifies the most important rules governing transport, partitioning, retention and transformation of leaked motor fuels in the underground environment. It examines micro-scale fate and transport processes as a means toward promoting a better understanding of larger scale movement of contaminants. Environmental scientists, engineers, consultants, and managers will find Mobility and Degradation of Organic Contaminants in Subsurface Environments to be a useful technical handbook. Less experienced users will appreciate its in-depth explanations of the fate and transport processes vital to effective remedial response. More experienced users will use the book as a source of information, data and equations to support quantitative assessments of pollutant fate and transport.Introduction -- Section 1: Contaminant Vapors as a Component of Soil Gas in the Unsaturated Zone -- Section 2: Liquid Contaminants Adhering to Water-Dry Soil Particles in the Unsaturated Zone -- Section 3: Contaminants Dissolved in the Water Film Surrounding Soil Particles in the Unsaturated Zone -- Section 4: Contaminants Sorbed to Water-Wet Soil Particles or Rock Surface (After Migrating Through the Water) in Either the Unsaturated or Saturated Zone -- Section 5: Liquid Contaminants in the Pore Spaces Between Soil Particles in the Saturated Zone -- Section 6: Liquid Contaminants in the Pore Spaces Between Soil Particles in the Unsaturated Zone -- Section 7: Liquid Contaminants Floating Upon the Water Tables -- Section 8: Contaminants Dissolved in Groundwater -- Section 9: Contaminants Sorbed onto Colloidal Particles in Water in Either the Unsaturated or Saturated Zone -- Section 10: Contaminants That Have Diffused into Mineral Grains or Rocks in Either the Unsaturated or Saturated Zone -- Section 11: Contaminants Sorbed onto or into Soil Microbiota in Either the Saturated or Unsaturated Zone -- Section 12: Contaminants Dissolved in the Mobile Pore Water of the Unsaturated Zone -- Secls#